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- Words: 11,544
- Pages: 110
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// array1.java 1. public class array1{ 2. public static void main(String args[]){ 3. double a[]=new double[10]; 4. for(int i=0; i<10; i++){ 5. a[i]=i*2.5; 6. System.out.println(a[i]); 7. } // end for 8. } // end main 9. } // end class array1
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// array2.java 1. import javax.swing.*; 2. public class array2{ 3. public static void main(String args[]){ 4. int b[]=new int[5]; 5. String s; 6. for(int i=0; i<5; i++){ 7. s=JOptionPane.showInputDialog("Enter a number:"); 8. b[i]=Integer.parseInt(s); 9. } // end for 10. for(int i=0; i<5; i++) -٥-
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//array3.java 1. import javax.swing.*; 2. class array3{ 3. public static void main(String args[]){ 4. String s, output, title, str1, str2; 5. str1="Enter how many number you want to store in the array:"; 6. str2="Enter number # "; 7. int n, odd=0; 8. s=JOptionPane.showInputDialog(str1); 9. n=Integer.parseInt(s); 10. int [] arr=new int[n]; 11. output= " "; 12. for(int i=0; i<arr.length; i++){ 13. s=JOptionPane.showInputDialog(str2+(i+1)+":"); 14. arr[i]=Integer.parseInt(s); 15. output+=arr[i]+"\n "; 16. } //end for 17. for(int i=0; i<arr.length; i++) 18. if(arr[i]%2==1) odd++; // end for 19. title="The results of the example (1-3)"; 20. output+="\nThere are "+odd+" odd numbers in the array"; 21. JOptionPane.showMessageDialog(null, output, title, JOptionPane.INFORMATION_MESSAGE); 22. System.exit(0); 23. } //end main 24. } //end class array3 -٨-
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W٤-١W // array4.java 1. 2. 3. 4. 5. 6.
import javax.swing.*; class array4{ public static void main(String args[]){ int a[]={2, 4, 5, -5, 3, 10, 4, 11, 1, 7, -2}; String title="The results of the Example (1-4)"; String results="";
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W٥-١W // array5.java 1. 2. 3. 4. 5. 6. 7. 8.
import javax.swing.*; class array5{ public static void main(String args[]){ double marks[] = new double[6]; String names[] = new String[6]; String s; String t1 = ”Enter the Student's name:”; String t2 = "Enter his mark:"; - ١١ -
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9. for(int i=0; i<6; i++){ 10. s=JOptionPane.showInputDialog(t1); 11. names[i]=s; 12. s=JOptionPane.showInputDialog(t2); 13. marks[i]=Double.parseDouble(s); 14. } 15. String title = "The passed students"; 16. String results="The following students are passed the exam:\n"; 17. for(int i=0; i<6; i++){ 18. if(marks[i] rel="nofollow">=60) 19. results=results+names[i]+"\n"; 20. } 21. JOptionPane.showMessageDialog(null, results, title, JOptionPane.INFORMATION_MESSAGE); 22. System.exit(0); 23. } 24. }
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W٦-١W // array6.java 1. import javax.swing.*; 2. class array6{ 3. public static void main(String args[]){ 4. int num[] = new int[]{4, 6, 2, 3, 9, 5, 7, 2, 4, 7}; 5. String output="The Contents of the array are:\n"; 6. String title="The results of the Example (1-6)"; 7. for(int i=0; i<=num.length-1; i++) 8. output+=num[i]+" "; 9. output+="\nThe Contents of the array in reverse order are:\n"; 10. for(int i=num.length-1; i>=0; i--) 11. output+=num[i]+" "; 12. JOptionPane.showMessageDialog(null, output, title, JOptionPane.INFORMATION_MESSAGE); 13. System.exit(0); 14. } 15. } Wא
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W٧-١ // array7.java 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23.
import javax.swing.*; class array7{ public static void main(String args[]){ int num[] = new int[] {4, 6, 2, 3, 9, 5, 8, 1, 10, 7}; int temp; String title="The results of the Example (1-7)"; String output="Array contents in original order:\n"; for(int i=0; inum[j+1]){ temp=num[j]; num[j]=num[j+1]; num[j+1]=temp; } output+="\n\nArray contents in ascending order:\n"; for(int i=0; i
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W٨-١ // array8.java 1. 2. 3. 4. 5.
import javax.swing.*; class array8{ public static void main(String args[]){ JTextArea outArea= new JTextArea(); int mark[] = new int[] {78, 81, 52, 92, 48, 90, 66, 40, 96,84}; - ١٧ -
6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32.
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String name[]= {"Ahmad", "Mohammed", "Naser", "Saleem", "Adel", "Khaled", "Ali", "Kareem", "Jamil", "Nader"}; int temp_mark; String temp_name; String title="The results of the Example (1-8)"; String output="The students' marks in original order:\n"; output+="Name\tMark\n------------------\t--------\n"; for(int i=0; i<mark.length; i++) output+=name[i]+"\t"+mark[i]+"\n"; for(int i=1; i<mark.length; i++) for(int j=0; j<mark.length-1; j++) if(mark[j]<mark[j+1]){ temp_mark=mark[j]; mark[j]=mark[j+1]; mark[j+1]=temp_mark; temp_name=name[j]; name[j]=name[j+1]; name[j+1]=temp_name; } output+="\n\nStudents' Marks in descending order:\n"; output+="Name\tMark\n------------------\t--------\n"; for(int i=0; i<mark.length; i++) output+=name[i]+"\t"+mark[i]+"\n"; outArea.setText(output); JOptionPane.showMessageDialog(null, outArea, title, JOptionPane.PLAIN_MESSAGE); System.exit(0); } }
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W٩-١ // array9.java 1. 2. 3. 4. 5. 6. 7.
import javax.swing.*; class array9{ public static void main(String args[]){ int n[] = new int[10]; int num, k=-1; String title="The results of the Example (1-9)"; String s, output="";
8. 9. 10.
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break; } if(k!=-1) output+="Found value in index "+k; else output+="Value not found"; JOptionPane.showMessageDialog(null, output, title, JOptionPane.PLAIN_MESSAGE); System.exit(0); } }
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// array10.java 1. 2. 3. 4. 5.
6. 7. 8. 9.
import javax.swing.*; class array10{ public static void main(String args[]){ int id[] = new int[] {2, 10, 1, 7, 4, 6, 3, 8, 5, 9}; String name[]= {"Ahmad", "Mohammed", "Naser", "Saleem", "Adel", "Khaled", "Ali", "Kareem", "Jamil", "Nader"};
10.
String s, stdName, title="The results of the Example (1-10)"; String output="The student's name is:--> "; int no, index=-1; s=JOptionPane.showInputDialog("Enter the student's ID to display his name:"); no=Integer.parseInt(s);
11. 12. 13. 14. 15. 16. 17.
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18. 19. 20. 21. 22. 23.
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else output="There is no student with this ID !!!"; JOptionPane.showMessageDialog(null, output, title, JOptionPane.PLAIN_MESSAGE); System.exit(0); } }
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W١١-١ // array11.java 1. 2. 3. 4. 5.
import javax.swing.*; class array11{ public static void main(String args[]){ int id[] = new int[] {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}; String name[]= {"Ahmad", "Mohammed", "Naser", "Saleem", "Adel", "Khaled", "Ali", "Kareem", "Jamil", "Nader"};
6. 7. 8. 9. 10. 11. 12. 13.
String s, stdName, title="The results of the Example (1-11)"; String output="The student's name is:--> "; int no, index=-1; int low=0; int high = id.length-1; int middle; s=JOptionPane.showInputDialog("Enter the student's ID to display his name:"); no=Integer.parseInt(s);
14.
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15. 16.
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17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32.
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// array12.java 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11.
public class array9{ public static void main(String[] args) { int[] testArray = new int[50]; testArray[43] = 10; int testArray2[] = { 35, 23, 8, 34, 66, 88, 5, 2, 85, 33 }; int key, index=-1; key=10; System.out.println("Searching for element == 10"); for(int i = 0; i < testArray.length; i++) { if(testArray[i] == key) index = i; - ٢٦ -
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13. 14. 15. 16.
if(index != -1) System.out.println("Element found at " + index); else System.out.println("Element (10) does not found at the array testArray"); index=-1; key=88; System.out.println("Searching the second array for element == 88");
17. 18. 19. 20. 21. 22. 23.
for(int i = 0; i < testArray2.length; i++) { if(testArray2[i] == key) index = i; }
24. 25. 26. 27.
if(index != -1) System.out.println("Element found at " + index); else System.out.println("Element (88) does not found at the array testArray2"); } }
28.
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int a[][]; a = new int[ 2 ][ ]; // allocate rows a[ 0 ] = new int[ 5 ]; // allocate row 0 a[ 1 ] = new int[ 3 ]; // allocate row 1 - ٣٠ -
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// array13.java 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18.
public class array13 { public static void main(String[] args) { int array1[][] = { { 1, 2, 3 }, { 4, 5, 6 } }; int array2[][] = { { 1, 2 }, { 3 }, { 4, 5, 6 } }; System.out.println("The contents of the array1 are:"); for(int i=0; i<array1.length; i++){ for(int j=0; j<array1[i].length; j++) System.out.print("\t"+array1[i][j]+"\t"); System.out.println(); } System.out.println("The contents of the array2 are:"); for(int i=0; i<array2.length; i++){ for(int j=0; j<array2[i].length; j++) System.out.print("\t"+array2[i][j]+"\t"); System.out.println(); } } } Wא
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W١٤-١ // array14.java 1.
public class array14{
2. 3. 4. 5.
public static void main(String[] args) { int grades[][] = { { 77, 68, 86, 73 }, { 96, 87, 89, 81 }, { 70, 90, 86, 81 } };
6. 7.
int sum; System.out.println("The array is:"); - ٣٣ -
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9. 10. 11. 12. 13. 14.
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16. 17. 18. 19. 20. 21. 22. 23.
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12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30.
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public class UseMath{ public static void main( String args[]){ System.out.println("The square root of 100 = " + Math.sqrt(100)); System.out.println("The absolute value of 20 = " + Math.abs(20)); System.out.println("The absolute value of -20 = " + Math.abs(-20)); System.out.println("The absolute value of 0 = " + Math.abs(0)); System.out.println("4 to the power 2 = " + Math.pow(4,2)); } // end of main } // end of class UseMath
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public class RollDie{ public static void main( String args[]){ int face ;//variables to store the result for (int i = 1;i<=5;i++){ face = 1+(int)(Math.random()*6); System.out.println("The Face in Try " + i + " is " + face); } // end for loop } // end of main } // end of class RollDie - ٤٣ -
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public class Methods { // instance variable declaration . . . public void method1(){ //body } public void method2(int i , double j){ //body } public int method3(){ //body return 0; //integer expression } public int method4(int i ,String s ){ //body return 0; //integer expression } } Wא
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WE٤-٢F // MethodCall.java 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25.
public class MethodCall { public static void main(String args[]){ int x = 5, y = 6, z = 0, s = 0; sum1(10, 5); sum1(x, y); s =sum2(5, 6); System.out.println("sum = " + sum2(5, 6)); z = 12 + 3 * sum2(x, 10); sum1(sum2(3, 4), 5); } // end of main // defining the method sum1 static void sum1(int num1,int num2){ int sum=0;//local variable sum= num1+num2 ; System.out.println("sum = "+ sum); } // end of sum1 // defining the method sum2 static int sum2(int num1,int num2){ int sum=0; // local variable sum= num1+num2 ; return sum ;// returned value } // end of sum2 }// end of class MethodCall Wא
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public class VariableScope{ static int i; //instance variable public static void main(String args[]){ int x = 5, y = 6; //local variables i = 10; System.out.println(“i = “ + i); i = method1(x, y); System.out.println(“i = “ + i); i = method2(x, y); System.out.println(“i = “ + i); } //end main - ٥٣ -
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12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28.
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import javax.swing.JOptionPane; public class factorial { public static void main (String args[ ]){ String snum1; - ٥٩ -
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10. 11. 12. 13. 14. 15. 16. 17. 18.
static int fact(int n){ if (n == 0 || n ==1) return 1; else return n * fact(n-1); } //end of fact method } //end of class factorial
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// Overload.java 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26.
public class Overload { public static void main(String args[]){ sum(); sum(100,3); System.out.println("sum= " + sum(8.5, 4)); System.out.println("sum= " + sum(10, 4.2)); System.out.println("sum= " + sum(8, 9, 4)); } // no parametrs no return static void sum () { int num1 = 10, num2 = 5; System.out.println("sum = " + (num1 + num2)); } // has two parametes and no return static void sum (int num1, int num2) { System.out.println("sum = " + (num1 + num2)); } // has two parametes and return double static double sum( double num1, int num2) { return (double)(num1 + num2); } // has two parameters and return double // but different order of the parameters static double sum(int num2 ,double num1) { - ٦٢ -
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else if (i<0) System.out.println(" \"" + s + "\"" + " is < " + "\"" + t + "\"\n"); else System.out.println(" \"" + s + "\"" + " is > " + "\"" + t +"\"\n"); i = s.compareToIgnoreCase(t); System.out.print(" Ignoring case: "); if (i == 0) System.out.println(" \"" + s + "\"" + " is == " + "\"" + t + "\"\n"); else if (i<0) System.out.println(" \"" + s + "\"" + " is < " + "\"" + t + "\"\n"); else System.out.println(" \"" + s + "\"" + " is > " + "\"" + t +"\"\n"); b = s.equals(t); System.out.println(" Is " + "\"" + s + "\"" + " equals to " + "\"" + t + "\"" + " ? " + b +"\n"); b = s.equalsIgnoreCase(t); System.out.print(" Is " + "\"" + s + "\"" + " equals to "); System.out.println("\"" + t + "\"" + " (ignoring case)? " + b + "\n"); b = s.startsWith("H"); System.out.println(" Is " + "\"" + s + "\"" + " starts with \"H\"? " + b + "\n"); b = s.startsWith("l", 3); System.out.print(" Is " + "\"" + s + "\"" + " starts with \"l\" "); System.out.println("from position 3 ? " + b + "\n"); b = s.endsWith("lo"); System.out.print (" Is " + "\"" + s + "\"" + " ends with \"lo\""); System.out.println(" ,from position 3 ? " + b + "\n"); i = s0.indexOf("Java"); System.out.print (" Java is at position "); System.out.println( i + " of " + "\"" + s0 + "\"\n"); i = s0.indexOf("java", 4); System.out.print(" java is at position" + i +"of "); System.out.println(" \"" + s0 + "\"" + ", starting from position 4\n"); i = s0.indexOf('e'); System.out.print (" \'e\' is at position "); - ٦٨ -
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System.out.println(i + " of " + "\"" + s0 + "\"\n"); i = s0.indexOf('e', 4); System.out.print (" \'e\' is at position " + i + " of "); System.out.println("\"" + s0 + "\"" + " starting from position 4\n"); i = s0.lastIndexOf('e'); System.out.print(" Last occurrence of \'e\' in "); System.out.println("\"" + s0 + "\"" + " is at "+ I + "\n"); i = s0.lastIndexOf(t); System.out.print(" Last occurrence of 'rl' in "); System.out.println("\"" + s0 + "\"" + " is at " + I + "\n"); c = s0.charAt(3); System.out.print(" The character at position 3 in"); System.out.println("\"" + s0 + "\"" + " is " + c + "\n"); s3 = s0.substring(6); System.out.print (" The substring of "); System.out.println("\"" + s0 + "\"" + " starting from 6 is\n" + "\t\t\t\"" + s3 + "\"\n"); 63. s1 = s0.substring(6, 10); 64. System.out.print(" Substring of " + "\"" + s0 + "\"" + " starting "); 65. System.out.println("from 6 to 10 is:" + "\"" + s1 + "\"\n"); 66. System.out.print (" \"" + s0 + "\"" + " in lowercase is "); 67. System.out.println("\"" + s0.toLowerCase() + "\"\n"); 68. System.out.print("\""+ s0 + "\"" + "in uppercase "); 69. System.out.println("\""+ s0.toUpperCase() + "\"\n"); 70. System.out.print(" \"" + s0 + "\"" + " with replacing all spaces "); 71. System.out.println("with ';' is\n" + "\t\t\t\"" + s0.replace( ' ',';')+"\""); 72. System.out.println(); 73. } 74. } א א א א א א E١٦-٢F א K(String)אא
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public class primenumbers{ public static void main(String [] args) { System.out.println("The Prime numbers between 1 and 100 are"); for (int i = 0; i < 100; i++) if (isPrime(i)) System. out. print(i + " "); } static boolean isPrime(int test) { if (test < 2) return false; if (test == 2) return true; for (int i = 2; i < test; i++) - ٧٤ -
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import java.util.Date;
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public class Account {
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private int account_number; private double balance ; private Date last_transaction_date;
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public class Bank { public static void main(String[] args) { Account acc =new Account(); Acc.deposit(1000); } } Wא
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// Account.java 1. 2. 3. 4. 5. 6. 7.
import java.util.Date; import javax.swing.JOptionPane; class Account{ private int account_no; private String customer_name; private double balance; Date last_Transaction_Date;
8. 9. 10. 11.
Account(int no ,String name ){ account_no=no; customer_name=name; }
12. 13. 14. 15. 16.
Account(int no ,String name ,double amt ){ account_no=no; customer_name=name; balance=amt; }
17. 18. 19. 20. 21. 22. 23. 24.
void deposit (double amt) { if (amt rel="nofollow">0 ){ balance += amt; last_Transaction_Date= new Date(); } else JOptionPane.showMessageDialog(null,"the deposit amount must be > 0"); }
25.
void withdraw(double amt){ - ٨٣ -
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33. 34. 35.
public double getBalance(){ return balance; }
36. 37. 38. 39.
public String getCustomer(){ return customer_name; } }
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acc1.deposit(2341.5); acc2.withdraw(200);
7. 8. 9.
System.out.println("\n Name: "+acc1.getCustomer()); System.out.println("\tHis Balance= " + acc1.getBalance()); System.out.println("\tThe date of the last transaction is: " + acc1.last_Transaction_Date);
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WE٤-٣F // client_account.java 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21.
package java2.classes.ch3; class A{ . . . } class B{ . . . } public class client_account{ public static void main(String args[]){ . . . } } Wא
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WE٦-٣F // Cars.java 1. 2. 3. 4. 5. 6.
class Transportation{ protected static int x=12; private int y=19; public static void meth1(){ System.out.println("Calling meth1() from class Cars."); }
7. 8. 9. 10.
private void meth2(){ System.out.println("will not be called from Cars"); } } // end of class Transportation
11. 12. 13. 14. 15.
public class Cars extends Transportation{ public static void main(String args[]){ meth1(); System.out.println(x); // meth2(); // meth2() has private access in // Transportation // System.out.println(y); // y has private access // on Transportation } } // end of class Cars
16. 17. 18.
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// C.java 1. class A{ 2. protected int a=9; 3. } // end of class A 4. class B extends A{ 5. void test(){ 6. int a=22; 7. System.out.println("a = "+a); 8. } 9. } // end of class B 10. public class C{ 11. public static void main(String args[]){ 12. B acc=new B(); 13. acc.test(); 14. } 15. } // end of class C
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// C.java 1. class A{ 2. protected int a=9; 3. } // end of class A 4. class B extends A{ 5. void test(){ - ٩٣ -
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6. int a=22; 7. System.out.println("a = "+this.a); 8. } 9. } // end of class B 10. public class C{ 11. public static void main(String args[]){ 12. B acc=new B(); 13. acc.test(); 14. } 15. } // end of class C
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// C.java 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12.
class A{ void test1(){ System.out.println("The test1() method was invoked FROM class A"); } } // end of class A
13. 14.
class B extends A{ void test(){ super.test1(); test1(); } void test1(){ System.out.println("The test1() method was invoked FROM class B"); } } // end of class B
15. 16. 17. 18. 19. 20.
public class C{ public static void main(String args[]){ B acc=new B(); acc.test(); } } // end of class C Wא
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// Test.java 1. 2. 3.
class Car { private int year; private float originalPrice; - ٩٦ -
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4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20.
// calculate the sale price of a car based on its // cost public double CalculateSalePrice() { double salePrice; if (year > 1994) salePrice = originalPrice * 0.75; else if (year > 1990) salePrice = originalPrice * 0.50; else salePrice = originalPrice * 0.25; return salePrice; } // a public constructor public Car(int year, float originalPrice) { this.year = year; this.originalPrice = originalPrice; } }
21. 22.
class ClassicCar extends Car { // calculate the sale price of a car based on its // cost 23. public double CalculateSalePrice() { 24. return 10000; 25. } 26. 27. 28. 29. 30.
// a public constructor public ClassicCar(int year, float originalPrice) { super(year, originalPrice); } }
31. 32. 33. 34.
public class Test{ public static void main(String args[]){ ClassicCar myClassic = new ClassicCar(1920, 1400); double classicPrice = - ٩٧ -
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35. 36. 37. 38. 39. 40.
myClassic.CalculateSalePrice(); System.out.println(classicPrice); Car myCar = new Car(1990, 12000); double price = myCar.CalculateSalePrice(); System.out.println(price); } } Wא
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import javax.swing.*; class array4{ public static void main(String args[]){ int a[]={2, 4, 5, -5, 3, 10, 4, 11, 1, 7, -2}; String title="The results of the Example (1-4)"; String results="";
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import javax.swing.*; class array5{ public static void main(String args[]){ double marks[] = new double[6]; String names[] = new String[6]; String s; String t1 = ”Enter the Student's name:”; String t2 = "Enter his mark:"; - ١١ -
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W٧-١ // array7.java 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23.
import javax.swing.*; class array7{ public static void main(String args[]){ int num[] = new int[] {4, 6, 2, 3, 9, 5, 8, 1, 10, 7}; int temp; String title="The results of the Example (1-7)"; String output="Array contents in original order:\n"; for(int i=0; i
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W٨-١ // array8.java 1. 2. 3. 4. 5.
import javax.swing.*; class array8{ public static void main(String args[]){ JTextArea outArea= new JTextArea(); int mark[] = new int[] {78, 81, 52, 92, 48, 90, 66, 40, 96,84}; - ١٧ -
6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32.
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String name[]= {"Ahmad", "Mohammed", "Naser", "Saleem", "Adel", "Khaled", "Ali", "Kareem", "Jamil", "Nader"}; int temp_mark; String temp_name; String title="The results of the Example (1-8)"; String output="The students' marks in original order:\n"; output+="Name\tMark\n------------------\t--------\n"; for(int i=0; i<mark.length; i++) output+=name[i]+"\t"+mark[i]+"\n"; for(int i=1; i<mark.length; i++) for(int j=0; j<mark.length-1; j++) if(mark[j]<mark[j+1]){ temp_mark=mark[j]; mark[j]=mark[j+1]; mark[j+1]=temp_mark; temp_name=name[j]; name[j]=name[j+1]; name[j+1]=temp_name; } output+="\n\nStudents' Marks in descending order:\n"; output+="Name\tMark\n------------------\t--------\n"; for(int i=0; i<mark.length; i++) output+=name[i]+"\t"+mark[i]+"\n"; outArea.setText(output); JOptionPane.showMessageDialog(null, outArea, title, JOptionPane.PLAIN_MESSAGE); System.exit(0); } }
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import javax.swing.*; class array9{ public static void main(String args[]){ int n[] = new int[10]; int num, k=-1; String title="The results of the Example (1-9)"; String s, output="";
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import javax.swing.*; class array10{ public static void main(String args[]){ int id[] = new int[] {2, 10, 1, 7, 4, 6, 3, 8, 5, 9}; String name[]= {"Ahmad", "Mohammed", "Naser", "Saleem", "Adel", "Khaled", "Ali", "Kareem", "Jamil", "Nader"};
10.
String s, stdName, title="The results of the Example (1-10)"; String output="The student's name is:--> "; int no, index=-1; s=JOptionPane.showInputDialog("Enter the student's ID to display his name:"); no=Integer.parseInt(s);
11. 12. 13. 14. 15. 16. 17.
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18. 19. 20. 21. 22. 23.
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W١١-١ // array11.java 1. 2. 3. 4. 5.
import javax.swing.*; class array11{ public static void main(String args[]){ int id[] = new int[] {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}; String name[]= {"Ahmad", "Mohammed", "Naser", "Saleem", "Adel", "Khaled", "Ali", "Kareem", "Jamil", "Nader"};
6. 7. 8. 9. 10. 11. 12. 13.
String s, stdName, title="The results of the Example (1-11)"; String output="The student's name is:--> "; int no, index=-1; int low=0; int high = id.length-1; int middle; s=JOptionPane.showInputDialog("Enter the student's ID to display his name:"); no=Integer.parseInt(s);
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15. 16.
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17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32.
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public class array9{ public static void main(String[] args) { int[] testArray = new int[50]; testArray[43] = 10; int testArray2[] = { 35, 23, 8, 34, 66, 88, 5, 2, 85, 33 }; int key, index=-1; key=10; System.out.println("Searching for element == 10"); for(int i = 0; i < testArray.length; i++) { if(testArray[i] == key) index = i; - ٢٦ -
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17. 18. 19. 20. 21. 22. 23.
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24. 25. 26. 27.
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// array13.java 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18.
public class array13 { public static void main(String[] args) { int array1[][] = { { 1, 2, 3 }, { 4, 5, 6 } }; int array2[][] = { { 1, 2 }, { 3 }, { 4, 5, 6 } }; System.out.println("The contents of the array1 are:"); for(int i=0; i<array1.length; i++){ for(int j=0; j<array1[i].length; j++) System.out.print("\t"+array1[i][j]+"\t"); System.out.println(); } System.out.println("The contents of the array2 are:"); for(int i=0; i<array2.length; i++){ for(int j=0; j<array2[i].length; j++) System.out.print("\t"+array2[i][j]+"\t"); System.out.println(); } } } Wא
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W١٤-١ // array14.java 1.
public class array14{
2. 3. 4. 5.
public static void main(String[] args) { int grades[][] = { { 77, 68, 86, 73 }, { 96, 87, 89, 81 }, { 70, 90, 86, 81 } };
6. 7.
int sum; System.out.println("The array is:"); - ٣٣ -
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16. 17. 18. 19. 20. 21. 22. 23.
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// array15.java 1. 2. 3.
public class array15{ public static void main(String[] args) { int nums[][]= { {21, 24, 43, 54}, {15, 63, 27, 84}, {29, 10, 17, 42}, {28, 33, 41, 67} }; int sum=0; System.out.println("The contents of array nums are:"); for(int i=0; i
12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30.
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sum+=nums[1][k]; System.out.println("\nThe sume of elements on the 2nd row is: "+sum); sum=0; for(int k=0; k
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E١-٢F W١-٢ // UseMath.java 1. 2. 3. 4. 5. 6. 7. 8. 9.
public class UseMath{ public static void main( String args[]){ System.out.println("The square root of 100 = " + Math.sqrt(100)); System.out.println("The absolute value of 20 = " + Math.abs(20)); System.out.println("The absolute value of -20 = " + Math.abs(-20)); System.out.println("The absolute value of 0 = " + Math.abs(0)); System.out.println("4 to the power 2 = " + Math.pow(4,2)); } // end of main } // end of class UseMath
- ٤٢ -
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// RollDie.java 1. 2. 3. 4. 5. 6. 7. 8. 9.
public class RollDie{ public static void main( String args[]){ int face ;//variables to store the result for (int i = 1;i<=5;i++){ face = 1+(int)(Math.random()*6); System.out.println("The Face in Try " + i + " is " + face); } // end for loop } // end of main } // end of class RollDie - ٤٣ -
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WE٣-٢F // Methods.java 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20.
public class Methods { // instance variable declaration . . . public void method1(){ //body } public void method2(int i , double j){ //body } public int method3(){ //body return 0; //integer expression } public int method4(int i ,String s ){ //body return 0; //integer expression } } Wא
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WE٤-٢F // MethodCall.java 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25.
public class MethodCall { public static void main(String args[]){ int x = 5, y = 6, z = 0, s = 0; sum1(10, 5); sum1(x, y); s =sum2(5, 6); System.out.println("sum = " + sum2(5, 6)); z = 12 + 3 * sum2(x, 10); sum1(sum2(3, 4), 5); } // end of main // defining the method sum1 static void sum1(int num1,int num2){ int sum=0;//local variable sum= num1+num2 ; System.out.println("sum = "+ sum); } // end of sum1 // defining the method sum2 static int sum2(int num1,int num2){ int sum=0; // local variable sum= num1+num2 ; return sum ;// returned value } // end of sum2 }// end of class MethodCall Wא
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// VariableScope.java 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11.
public class VariableScope{ static int i; //instance variable public static void main(String args[]){ int x = 5, y = 6; //local variables i = 10; System.out.println(“i = “ + i); i = method1(x, y); System.out.println(“i = “ + i); i = method2(x, y); System.out.println(“i = “ + i); } //end main - ٥٣ -
WE٥-٢F
12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28.
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static int method1(int arg11 ,int arg12 ){ double num11 ,num12; for(int counter = 0; counter <= 5; counter++){ i+= counter; } //end of for counter loop return i+arg11+arg12; } //end method1 static int method2 (int arg21, int arg22){ int num21, num22, i=0; //local variables { String s; //local variable } return i+arg21+arg22; } //end method1 } //end of class VariableScope
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// Passing_Parameters.java 1. public class Passing_Parametres{ 2. public static void main(String args[]){ 3. int x; 4. int a[] = {1, 2, 3, 4}; 5. x = a[1]; 6. System.out.println("The value of x before change is" + x) ; 7. System.out.println("The value of a elements before change is: "); 8. printArray(a); 9. change(a, x); 10. System.out.println("The value of x after change is" + x); 11. System.out.println("The value of a elements after change is: "); 12. printArray(a); 13. } //end of main 14. static void change(int b[], int i){ 15. i *= 2 ; 16. for (int index=0; index < b.length; index++) 17. b[index]*= 2; 18. } //end of method change - ٥٦ -
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19. static void printArray(int c[]){ 20. for (int index=0; index < c.length; index++) 21. System.out.print(c[index] + "\t"); 22. System.out.println(); 23. } //end of method print 24. } //end of class Passing_Parametres Wא E٩F א Kאא א א א א א א א
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WE٧-٢F // factorial.java 1. 2. 3. 4.
import javax.swing.JOptionPane; public class factorial { public static void main (String args[ ]){ String snum1; - ٥٩ -
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int num1, fac_of_num1; snum1 = JOptionPane.showInputDialog("Enter num1:") ;
7. 8. 9.
num1 = Integer.parseInt(snum1); fac_of_num1 = fact(num1); JOptionPane.showMessageDialog(null, num1 + "! = " + fac_of_num1); } //end of main
10. 11. 12. 13. 14. 15. 16. 17. 18.
static int fact(int n){ if (n == 0 || n ==1) return 1; else return n * fact(n-1); } //end of fact method } //end of class factorial
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// Overload.java 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26.
public class Overload { public static void main(String args[]){ sum(); sum(100,3); System.out.println("sum= " + sum(8.5, 4)); System.out.println("sum= " + sum(10, 4.2)); System.out.println("sum= " + sum(8, 9, 4)); } // no parametrs no return static void sum () { int num1 = 10, num2 = 5; System.out.println("sum = " + (num1 + num2)); } // has two parametes and no return static void sum (int num1, int num2) { System.out.println("sum = " + (num1 + num2)); } // has two parametes and return double static double sum( double num1, int num2) { return (double)(num1 + num2); } // has two parameters and return double // but different order of the parameters static double sum(int num2 ,double num1) { - ٦٢ -
27. 28. 29. 30. 31. 32. 33. 34.
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return (double)(num1 + num2); } // has three parameters and return integer static int sum(int num1, int num2, int num3) { return num1+num2+num3; } } Wא
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else if (i<0) System.out.println(" \"" + s + "\"" + " is < " + "\"" + t + "\"\n"); else System.out.println(" \"" + s + "\"" + " is > " + "\"" + t +"\"\n"); i = s.compareToIgnoreCase(t); System.out.print(" Ignoring case: "); if (i == 0) System.out.println(" \"" + s + "\"" + " is == " + "\"" + t + "\"\n"); else if (i<0) System.out.println(" \"" + s + "\"" + " is < " + "\"" + t + "\"\n"); else System.out.println(" \"" + s + "\"" + " is > " + "\"" + t +"\"\n"); b = s.equals(t); System.out.println(" Is " + "\"" + s + "\"" + " equals to " + "\"" + t + "\"" + " ? " + b +"\n"); b = s.equalsIgnoreCase(t); System.out.print(" Is " + "\"" + s + "\"" + " equals to "); System.out.println("\"" + t + "\"" + " (ignoring case)? " + b + "\n"); b = s.startsWith("H"); System.out.println(" Is " + "\"" + s + "\"" + " starts with \"H\"? " + b + "\n"); b = s.startsWith("l", 3); System.out.print(" Is " + "\"" + s + "\"" + " starts with \"l\" "); System.out.println("from position 3 ? " + b + "\n"); b = s.endsWith("lo"); System.out.print (" Is " + "\"" + s + "\"" + " ends with \"lo\""); System.out.println(" ,from position 3 ? " + b + "\n"); i = s0.indexOf("Java"); System.out.print (" Java is at position "); System.out.println( i + " of " + "\"" + s0 + "\"\n"); i = s0.indexOf("java", 4); System.out.print(" java is at position" + i +"of "); System.out.println(" \"" + s0 + "\"" + ", starting from position 4\n"); i = s0.indexOf('e'); System.out.print (" \'e\' is at position "); - ٦٨ -
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public class primenumbers{ public static void main(String [] args) { System.out.println("The Prime numbers between 1 and 100 are"); for (int i = 0; i < 100; i++) if (isPrime(i)) System. out. print(i + " "); } static boolean isPrime(int test) { if (test < 2) return false; if (test == 2) return true; for (int i = 2; i < test; i++) - ٧٤ -
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WE١-٣F // Account.java 1.
import java.util.Date;
2.
public class Account {
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private int account_number; private double balance ; private Date last_transaction_date;
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public class Bank { public static void main(String[] args) { Account acc =new Account(); Acc.deposit(1000); } } Wא
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// Account.java 1. 2. 3. 4. 5. 6. 7.
import java.util.Date; import javax.swing.JOptionPane; class Account{ private int account_no; private String customer_name; private double balance; Date last_Transaction_Date;
8. 9. 10. 11.
Account(int no ,String name ){ account_no=no; customer_name=name; }
12. 13. 14. 15. 16.
Account(int no ,String name ,double amt ){ account_no=no; customer_name=name; balance=amt; }
17. 18. 19. 20. 21. 22. 23. 24.
void deposit (double amt) { if (amt rel="nofollow">0 ){ balance += amt; last_Transaction_Date= new Date(); } else JOptionPane.showMessageDialog(null,"the deposit amount must be > 0"); }
25.
void withdraw(double amt){ - ٨٣ -
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33. 34. 35.
public double getBalance(){ return balance; }
36. 37. 38. 39.
public String getCustomer(){ return customer_name; } }
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acc1.deposit(2341.5); acc2.withdraw(200);
7. 8. 9.
System.out.println("\n Name: "+acc1.getCustomer()); System.out.println("\tHis Balance= " + acc1.getBalance()); System.out.println("\tThe date of the last transaction is: " + acc1.last_Transaction_Date);
10.
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WE٤-٣F // client_account.java 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21.
package java2.classes.ch3; class A{ . . . } class B{ . . . } public class client_account{ public static void main(String args[]){ . . . } } Wא
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WE٦-٣F // Cars.java 1. 2. 3. 4. 5. 6.
class Transportation{ protected static int x=12; private int y=19; public static void meth1(){ System.out.println("Calling meth1() from class Cars."); }
7. 8. 9. 10.
private void meth2(){ System.out.println("will not be called from Cars"); } } // end of class Transportation
11. 12. 13. 14. 15.
public class Cars extends Transportation{ public static void main(String args[]){ meth1(); System.out.println(x); // meth2(); // meth2() has private access in // Transportation // System.out.println(y); // y has private access // on Transportation } } // end of class Cars
16. 17. 18.
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// C.java 1. class A{ 2. protected int a=9; 3. } // end of class A 4. class B extends A{ 5. void test(){ 6. int a=22; 7. System.out.println("a = "+a); 8. } 9. } // end of class B 10. public class C{ 11. public static void main(String args[]){ 12. B acc=new B(); 13. acc.test(); 14. } 15. } // end of class C
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// C.java 1. class A{ 2. protected int a=9; 3. } // end of class A 4. class B extends A{ 5. void test(){ - ٩٣ -
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6. int a=22; 7. System.out.println("a = "+this.a); 8. } 9. } // end of class B 10. public class C{ 11. public static void main(String args[]){ 12. B acc=new B(); 13. acc.test(); 14. } 15. } // end of class C
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// C.java 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12.
class A{ void test1(){ System.out.println("The test1() method was invoked FROM class A"); } } // end of class A
13. 14.
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15. 16. 17. 18. 19. 20.
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class Car { private int year; private float originalPrice; - ٩٦ -
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// calculate the sale price of a car based on its // cost public double CalculateSalePrice() { double salePrice; if (year > 1994) salePrice = originalPrice * 0.75; else if (year > 1990) salePrice = originalPrice * 0.50; else salePrice = originalPrice * 0.25; return salePrice; } // a public constructor public Car(int year, float originalPrice) { this.year = year; this.originalPrice = originalPrice; } }
21. 22.
class ClassicCar extends Car { // calculate the sale price of a car based on its // cost 23. public double CalculateSalePrice() { 24. return 10000; 25. } 26. 27. 28. 29. 30.
// a public constructor public ClassicCar(int year, float originalPrice) { super(year, originalPrice); } }
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public class Test{ public static void main(String args[]){ ClassicCar myClassic = new ClassicCar(1920, 1400); double classicPrice = - ٩٧ -
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myClassic.CalculateSalePrice(); System.out.println(classicPrice); Car myCar = new Car(1990, 12000); double price = myCar.CalculateSalePrice(); System.out.println(price); } } Wא
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Deitel and Deitel, Java: How to Program, 3rd Edition, Prentice Hall, 2001 K١ Patrick Naughton and Michael Morrison, the Java Handbook, McGraw-Hill, 1996K٢ Bruce Eckel, Thinking in Java (2nd Edition), 2001K٣
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אאאאאא אEאFאא GOTEVOT appreciates the financial support provided by BAE SYSTEMS
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