A Nil

Prepared by: Ashok and Anil.

List of Java Programs

S.No Name of the program 01 02 03 04 5 6 7 8 9 10 11. a 11. b 12 13 14 15 16 17 18 19 20 21

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Java application to find the roots for the equation ax^2+bx+c=0 Write a java program to print Fibonacci series up to n terms using recursion Write a java program that prompts the user for an integer and then prints out all prime numbers up to that integer Write a java program that checks whether a given string is palindrome or not. Ex: MADAM is a palindrome. Write a java program for sorting a given list of names passed from the command line in ascending order Write a java application to multiply two Matrices Write a java application that reads a line of integers, and then display each integers and the sum of all integers (Using StringTokenizer class) Write a java program that reads file and displays information about whether the file is existing , readable, writable, type of file and length of file in bytes Write a java program that reads file and displays file on screen with Line number before each line Write a java program that text reads file and displays number of characters ,lines and words Write a java program that implements Stack ADT Write a java program to converts infix expression into Postfix form Write an applet that displays a simple message write a applet that computes loan payment based on the amount of the loan, the interest rate and the number of months Java application for a simple calculator Write a java program for handling mouse events Write a java program creating multiple Threads Producer Consumer Problem using Inter-Thread Communication Write a java program that lets user to create pie charts. Write a java program that allows the user to draw lines, rectangles and ovals Client-Server program where Client program to send radius to server and the server returns area of circle Write a java program that illustrates how run time polymorphism is achieved

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2-3

Prepared by: Ashok and Anil

/* 1.Java application to find the roots for the equation ax^2+bx+c=0 */ import java.util.*; public class FirstDemo { public static void main(String args[]) { Scanner sc=new Scanner(System.in); double a,b,c; System.out.println("Enter a,b and c values"); a=sc.nextDouble(); b=sc.nextDouble(); c=sc.nextDouble(); double d,r1,r2; d=b*b-4*a*c; if(d<0) System.out.println("There are no real roots, having complex roots"); else if(d==0) System.out.println("Both roots are equal: "+b+" and "+(-b)); else { r1=(-b+d)/2*a; r2=(-b-d)/2*a; System.out.println("Roots are: "+r1+" abd "+r2); } } } /* OUTPUT: C:\>javac FirstDemo.java C:\>java FirstDemo Enter a,b and c values 257 There are no real roots, having complex roots C:\>java FirstDemo Enter a,b and c values 3 12 4 Roots are: 126.0 abd -162.0 C:\>java FirstDemo Enter a,b and c values 121 Both roots are equal: 2.0 and -2.0 */

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/* 2.Write a java program to print fibonacci series up to n terms usinf recursion */ import javax.swing.JOptionPane; import java.util.*; class Fib { int a=0,b=1,c; String s=" "; void fibonacci(int n) { if(n==1) JOptionPane.showMessageDialog(null, "Fibonacci Serice is\n0 1"+s); else { c=a+b; a=b; b=c; s=s+c+" "; fibonacci(n-1); } } }// class Fib class Second { public static void main(String args[]) { Fib f=new Fib(); Scanner sc=new Scanner(System.in); System.out.println("Enter the num value..."); int num=sc.nextInt(); f.fibonacci(num); } } OUTPUT:

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/* 3. Write a java program that prompts the user for an integer and then prints out all prime numbers up to that integer */ import java.util.*; public class ThirdDemo { public static void main(String args[]) { Scanner sc=new Scanner(System.in); System.out.println("Enter up to which number"); int n=sc.nextInt(); int count=0,i=1,j,c; System.out.println("The prime numbers up to "+n+" numbers"); while(i<=n) { j=1; c=0; while(j<=i) { if(i%j==0) c++; j++; } if(c==2) { System.out.print(" "+i); count++; } i++; } System.out.println("\nTotal count:"+count); } } /* OUTPUT: C:\>javac ThirdDemo.java C:\>java ThirdDemo Enter up to which number 20 The prime numbers up to 20 numbers 2 3 5 7 11 13 17 19 Total count:8 */

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/*4. Write a java program that checks whethera given string is palindrome or not. Ex:MADAM is a palindrome. */ import java.util.*; public class Fourth { public static void main(String args[]) { Scanner sc=new Scanner(System.in); System.out.println("Enter a string..."); String str=sc.nextLine(); StringBuffer sb=new StringBuffer(str); String s=new String(sb.reverse()); if(str.compareTo(s)==0) System.out.println(str+" is Palindrome"); else System.out.println(str+" is not Polindrome"); } } /* OUTPUT: C:\>javac Fourth.java C:\>java Fourth Enter a string... MADAM MADAM is Palindrome C:\>java Fourth Enter a string... RAMA RAMA is not Polindrome C:\>java Fourth Enter a string... LIRIL LIRIL is Palindrome */

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/*5. Write a java program for sorting a given list of names passed from the command line in ascending order */ public class Fifth { public static void main(String args[]) { int n=args.length; String temp; for(int i=0; ijavac Fifth.java C:\>java Fifth ashok ramesk raju narsimha nagesh srinivas After sorting the names are... ashok nagesh narsimha raju ramesk srinivas */

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/*6.Write a java application to multiply two Matrices */ import java.util.*; public class SixthDemo { public static void main(String args[]) { int a[][]=new int[3][3],b[][]=new int[3][3],c[][]=new int[3][3],i,j,k; Scanner sc=new Scanner(System.in); System.out.println("Enter mat A(3*3) elements"); for(i=0;i<3;i++) for(j=0;j<3;j++) a[i][j]=sc.nextInt(); System.out.println("Enter mat b(3*3) elements"); for(i=0;i<3;i++) for(j=0;j<3;j++) b[i][j]=sc.nextInt(); for(i=0;i<3;i++) { for(j=0;j<3;j++) { c[i][j]=0; for(k=0;k<3;k++) c[i][j]+=a[i][k]*b[k][j]; } } System.out.println("The Result matrix C(3*3) is..."); for(i=0;i<3;i++) { for(j=0;j<3;j++) { System.out.print(c[i][j]+" "); } System.out.print("\n"); } } } /* OUTPUT: C:\>javac SixthDemo.java C:\>java SixthDemo Enter mat A(3*3) elements 123 456 789 Enter mat b(3*3) elements 100 010 001 The Result matrix C(3*3) is... 123 456 7 8 9*/

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/* 7.Write a java application that reads a line of integers, and then display each integers and the sum of all integers (Using StringTokenizer class) */ import java.util.*; public class SeventhDemo { public static void main(String args[]) { Scanner sc=new Scanner(System.in); System.out.println("Enter the numbers...."); String str=sc.nextLine(); StringTokenizer st=new StringTokenizer(str); int sum=0,i; System.out.println("The Integers are......"); while(st.hasMoreTokens()) { i=Integer.parseInt(st.nextToken()); sum+=i; System.out.println(" "+i); } System.out.println("The sum:"+sum); } } /* OUTPUT: C:\>javac SeventhDemo.java C:\>java SeventhDemo Enter the numbers.... 12425735 The Integers are...... 1 2 4 2 5 7 3 5 The sum:29 */

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/*8. Write a java program that reads file and displays information about whether the file is existing ,readable,writable,type of file and length of file in bytes */ import java.io.*; import java.util.*; class Prog8 { public static void main(String arg[])throws Exception { System.out.println("Enter File"); String nam=(new Scanner(System.in)).nextLine(); File f=new File(nam); System.out.println(nam+" is"+((f.exists())?" ":" not ")+"Exists"); System.out.println(nam+" is"+((f.canRead())?" ":" not ")+"Read Only"); System.out.println(nam+" is"+((f.canWrite())?" ":" not ")+"Writable"); System.out.println(nam+" length is "+f.length()); } } /* OUTPUT: C:\>javac Prog8.java C:\>java Prog8 Enter File prog8.class prog8.class is Exists prog8.class is Read Only prog8.class is Writable prog8.class length is 1192 */

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/*9.Write a java program that reads file and displays file on screen with Line number before each line */ import java.io.*; import java.util.*; class Prog9 { public static void main(String arg[])throws Exception { System.out.println("Enter File"); String nam=(new Scanner(System.in)).nextLine(); Scanner f=(new Scanner(new FileReader(nam))); int i=1; while(f.hasNext()) { nam=f.nextLine(); System.out.println(i+" "+nam); i++; } } } /* OUTPUT: C:\Lab>java Prog9 Enter File hai.txt 1 india is my country 2 all indians are my brothres 3 hello world 4 my first program 5 dassdfdf 6 fjkhk hjyuui */

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/*10.Write a java program that text reads file and displays number of characters ,lines and words */ import java.io.*; import java.util.*; class Prog10 { public static void main(String arg[])throws Exception { int w=0,c=0,l=0,j; System.out.println("Enter File"); String nam=(new Scanner(System.in)).nextLine(); Scanner f=(new Scanner(new FileReader(nam))); while(f.hasNext()) { nam=f.nextLine(); for(j=0;jjavac prog10.java C:\Lab>java Prog10 Enter File prog10.java no of characters511 no of words48 no of lines26 */

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/*11.a Write a java program that implements Stack ADT */ import java.util.*; class SDemo { int stack[]=new int[40],top=-1; public void push(int n) { if(top==stack.length) System.out.println("Stack is full insertion is not possiable..."); else { top++; stack[top]=n; System.out.println(n+" is inserted"); } } public void pop() { if(top==-1) System.out.println("Stack is empty deletion is not possiable.."); else { System.out.println("Deleted element is:"+stack[top]); top--; } } public void display() { System.out.println("********Stack content is***********"); for(int i=0;i<=top;i++) System.out.print(stack[i]+" "); System.out.print("\n"); } } class StackDemo { public static void main(String args[]) { SDemo obj=new SDemo(); int item,choice; Scanner sc=new Scanner(System.in); do { System.out.println("Enter your choice\n1.push\t2.pop\t3.print\t4.exit"); choice=sc.nextInt(); switch(choice) { case 1: System.out.println("Enter data to insert");

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item=sc.nextInt(); obj.push(item); break; case 2: obj.pop(); break; case 3: obj.display(); break; case 4: System.out.println("Program is exited..."); System.exit(0); break; default: System.out.println("Your choice is wrong.......!"); break; } } while (choice<5); } } /* OUTPUT: C:\>javac StackDemo.java C:\>java StackDemo Enter your choice 1.push 2.pop 3.print 4.exit 1 Enter data to insert 20 20 is inserted Enter your choice 1.push 2.pop 3.print 4.exit 1 Enter data to insert 30 30 is inserted Enter your choice 1.push 2.pop 3.print 4.exit 1 Enter data to insert 40 40 is inserted

Enter your choice 1.push 2.pop 3.print 4.exit 3 ********Stack content is*********** 20 30 40 Enter your choice 1.push 2.pop 3.print 4.exit 2 Deleted element is:40 Enter your choice 1.push 2.pop 3.print 4.exit 1 Enter data to insert 50 50 is inserted Enter your choice 1.push 2.pop 3.print 4.exit 3 ********Stack content is*********** 20 30 50 Enter your choice 1.push 2.pop 3.print 4.exit 4 Program is exited... */

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/* 11.b Write a java program to converts infix expression into Postfix form */ import java.util.*; class Exp { public static void main(String[] args) throws Exception { Scanner sc=new Scanner(System.in); System.out.println("enter infix exception"); String a=sc.nextLine(); a=new String(new StringBuffer(a).append(')')); push('('); for(int i=0;ip(b[j])) push(c); else { while(p(c)<=p(b[j]) && j>0) op[++k]=pop(); push(c); } System.out.println(c+" "+new String(b)+new String(op)); } System.out.println("postfix exp= "+new String(op)); } static char b[]=new char[30]; static char op[]=new char[30]; static int j=-1,k=-1; static char pop() { return(b[j--]); } static void push(char x) { b[++j]=x; } static int p(char x)

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{ switch(x) { case'+':case'-':return 1; case'*':case'/':return 2; case'^':return 3; } return 0; } } /* output: C:\LAB>javac Exp.java C:\LAB>java Exp enter infix exception a+b*c^d-e*f/h a ( a + (+ a b (+ ab * (+* ab c (+* abc ^ (+*^ abc d (+*^ abcd (-*^ abcd^*+ e (-*^ abcd^*+e * (-*^ abcd^*+e f (-*^ abcd^*+ef / (-/^ abcd^*+ef* h (-/^ abcd^*+ef*h ) (-/^ abcd^*+ef*h/postfix exp= abcd^*+ef*h/*/

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/*12. Write an applet that displays a simple message */ public class Program12 extends java.applet.Applet { String str=""; public void init() { str+="init\t"; System.out.println(str); } public void start() { str+="start\t"; System.out.println(str); } public void paint(java.awt.Graphics g) { str+="paint\t"; System.out.println(str); } public void stop() { str+="stop\t"; System.out.println(str); } public void destroy() { str+="desyroy\t"; System.out.println(str); } } /* */ /* OUTPUT: C:\>javac Program12.java C:\>appletviewer Program12.java init init start init start paint init start paint paint init start paint paint paint init start paint paint paint paint init start paint paint paint paint init start paint paint paint paint init start paint paint paint paint init start paint paint paint paint init start paint paint paint paint

paint paint paint paint paint

paint paint stop paint stop start paint paint stop

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destroy */

/*13. write a applet that computes loan payment based on the amount of the loan, the interest rate and the number of months*/ import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.applet.*; public class Program13 extends Applet implements ActionListener { TextField t1,t2,t3,t4; Label l1,l2,l3,l4; Button b; int m; float l,i,r; public void init() {} public void start() { t1=new TextField(20); l1=new Label("Loan Amount:"); add(l1); add(t1); t2=new TextField(20); l2=new Label("Interest:"); add(l2); add(t2); t3=new TextField(20); l3=new Label("No.Months:"); add(l3); add(t3); b=new Button("Result"); add(b); b.addActionListener(this); t4=new TextField(20); l4=new Label("Total Loan Amount:"); add(l4); add(t4); } public void actionPerformed(ActionEvent ae) { if(t1.getText().equals(" ")) JOptionPane.showMessageDialog(null,"Enter amount of loan"); else l=Float.parseFloat(t1.getText()); if(t2.getText().equals(" ")) JOptionPane.showMessageDialog(null,"Enter amount of interest"); else i=Float.parseFloat(t2.getText()); if(t3.getText().equals(" ")) m=12;

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else m=Integer.parseInt(t3.getText()); r=l+(l*m*i)/100; t4.setText(r+" "); } } /* */ OUTPUT:

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//14. Java application for a simple calculator import java.awt.*; import java.awt.event.*; class Calc implements ActionListener { TextField tf; String a="",b=""; float r; char op=' '; Calc() { Frame f=new Frame("Calc"); f.setLayout(null); Panel p=new Panel(); p.setBounds(20,90,200,200); p.setSize(200,200); p.setLayout(new GridLayout(4,4)); Button b[]=new Button[10],opb[]=new Button[6]; opb[0]=new Button("+"); opb[1]=new Button("-"); opb[2]=new Button("*"); opb[3]=new Button("/"); opb[4]=new Button("="); opb[5]=new Button("c"); tf=new TextField("0"); tf.setBounds(20,50,200,30); p.setVisible(true); for(int i=0;i<10;i++) { b[i]=new Button(""+i); p.add(b[i]); b[i].addActionListener(this); } for(int i=0;i<6;i++) { p.add(opb[i]); opb[i].addActionListener(this); } f.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent we) { System.exit(0); }} ); f.add(p); f.add(tf); f.setSize(250,300); f.setResizable(false); f.setBackground(new Color(200,110,110)); f.setVisible(true);

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} public void actionPerformed(ActionEvent ae) { char c=(ae.getActionCommand()).charAt(0); switch(c) { case '=': switch(op) { case '+':r=Float.parseFloat(a)+Float.parseFloat(b);op=' '; break; case '-':r=Float.parseFloat(a)-Float.parseFloat(b);op=' '; break; case '*':r=Float.parseFloat(a)*Float.parseFloat(b);op=' '; break; case '/':r=Float.parseFloat(a)/Float.parseFloat(b);op=' '; break; case ' ':r=Float.parseFloat(a)+r;break; } tf.setText(r+""); a=b="0"; break; case '+':case '-':case '/':case '*': op=c; if(Integer.parseInt(a)==0) a=r+""; break; case 'c':a=b="0";r=0; tf.setText("0"); break; default: if(op==' ') { a+=c; if(Integer.parseInt(a)==0) a="0"; tf.setText(a); } else { b+=c; if(Integer.parseInt(b)==0) b="0"; tf.setText(b); } } } public static void main(String args[]) { new Calc(); } }

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OUTPUT:

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/*15. Write a java program for handling mouse events */ import java.awt.*; import java.awt.event.*; class MouseDemo extends Frame { TextField tf; int x,y; MouseDemo() { setLayout(new FlowLayout(FlowLayout.CENTER)); tf=new TextField(30); setSize(400,400); setLocation(10,10); setTitle("MouseHandling Frame"); add(tf); setVisible(true); Listener obj=new Listener(); addMouseListener(obj); addMouseMotionListener(obj); addWindowListener(new WindowAdapter(){ public void windowClosing(WindowEvent e) { System.exit(0); }}); } class Listener implements MouseListener,MouseMotionListener { public void mouseEntered(MouseEvent me) { x=me.getX(); y=me.getY(); tf.setText("Mouse Entered at:["+x+","+y+"]"); } public void mouseExited(MouseEvent me) { x=me.getX(); y=me.getY(); tf.setText("Mouse Exiated at:["+x+","+y+"]"); } public void mouseClicked(MouseEvent me) { x=me.getX(); y=me.getY(); tf.setText("Mouse Clicked at:["+x+","+y+"]"); } public void mousePressed(MouseEvent me) { x=me.getX(); y=me.getY(); tf.setText("Mouse Pressed at:["+x+","+y+"]"); } public void mouseReleased(MouseEvent me) {

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x=me.getX(); y=me.getY(); tf.setText("Mouse Released at:["+x+","+y+"]"); } /* MouseMotionListener interface methods */ public void mouseMoved(MouseEvent me) { x=me.getX(); y=me.getY(); tf.setText("Mouse Moved at:["+x+","+y+"]"); } public void mouseDragged(MouseEvent me) { x=me.getX(); y=me.getY(); tf.setText("Mouse Dragged at:["+x+","+y+"]"); } } public static void main(String args[]) { new MouseDemo(); } } OUTPUT: C:\>javac MouseDemo.java C:\>java MouseDemo

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/*16. Write a java program creating multiple Threads */ import java.io.PrintWriter; class MultiThreadDemo { public static void main(String args[]) { new Thread(new T1()).start(); new Thread(new T2()).start(); for(int j=100;j>=95;j--) { try { Thread.sleep(1000); } catch (Exception e) { } System.out.println("main Thread:"+j); } } } class T1 implements Runnable { PrintWriter ou=new PrintWriter(System.out,true); public void run() { for(int i=0;i<5;i++) { try { Thread.sleep(500); } catch (Exception e) { } ou.println("Thread a:"+i); } } } class T2 implements Runnable { PrintWriter ou=new PrintWriter(System.out,true); public void run() { for(char i='a';i<'f';i++) { try { Thread.sleep(500); } catch (Exception e)

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{ } ou.println("Thread b:"+i); } } } /* OUTPUT: C:\>javac MultiThreaddemo.java C:\>java MultiThreadDemo Thread a:0 Thread b:a main Thread:100 Thread a:1 Thread b:b Thread a:2 Thread b:c main Thread:99 Thread a:3 Thread b:d Thread a:4 Thread b:e main Thread:98 main Thread:97 main Thread:96 main Thread:95 */

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/*17. Producer Consumer Problem using Inter-Thread Communication */ import java.util.*; class Q { int q; boolean f; synchronized public void put( int x) { try{ if(f==true) wait(); q=x; System.out.println("produced is"+q); f=true; notify(); }catch(Exception e){} } synchronized public void get( ) { try{ if(f==false) wait(); System.out.println("consumed is"+q); f=false; notify(); }catch(Exception e){} } } class P extends Thread { Q q; P(Q x) { q=x; } public void run() { int i=0; while(true) { try { Thread.sleep(1000); } catch (Exception e) { } q.put(i); i++; } }

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} class C extends Thread { Q q; C(Q x) { q=x; } public void run() { while(true) { q.get(); } } } class PC { Q q; PC() { q=new Q(); new Thread(new P(q)).start(); new Thread(new C(q)).start(); } public static void main(String args[]) { System.out.println("Press Enter to exit"); new PC(); Thread t=new Thread(new Zz()); t.setDaemon(true); t.start(); } } class Zz extends Thread { public void run() { String s=new Scanner(System.in).nextLine(); if(s!=null) System.exit(0); } } /*OUTPUT: C:\Lab>javac PC.java C:\Lab>java PC Press Enter to exit produced is0 consumed is0 produced is1

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consumed is1 produced is2 consumed is2 produced is3 consumed is3 produced is4 consumed is4 produced is5 consumed is5 */

/* 18.Write a java program that lets user to create pie charts.*/ import java.awt.*; import java.awt.event.*; class arc extends Frame implements ActionListener { Color c[]={new Color(0,255,255),new Color(255,0,255),new Color(255,255,0),new Color(0,0,255),new Color(0,255,0),new Color(255,0,0)}; double m[]=new double[6],s[]=new double[6], e[]=new double[6]; double an[]=new double[6]; Label lb[]=new Label[6]; TextField t[]=new TextField[6]; Button b=new Button("submit"); arc() { setLayout(new FlowLayout(FlowLayout.CENTER)); setSize(1000,800); setLocation(20,20); for(int i=0;i<6;i++) { t[i]=new TextField(9); int j=i+1; lb[i]=new Label("Subject"+j); add(lb[i]); add(t[i]); } b.setBounds(70,70,60,40); add(b); setResizable(false); setVisible(true); b.addActionListener(this); addWindowListener(new WindowAdapter(){ public void windowClosing(WindowEvent we) { System.exit(0); } }); } public void actionPerformed(ActionEvent ae) { double sm=0; for(int i=0;i<6;i++) { m[i]=Double.parseDouble(t[i].getText()); sm+=m[i]; } for(int i=0;i<6;i++) an[i]=m[i]/sm*360.0;

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s[0]=0;e[0]=(int)an[0]; for(int i=1;i<6;i++) { s[i]=e[i-1]; e[i]=s[i]+an[i]; } repaint(); } public void paint(Graphics g) { setBackground(Color.black); for(int i=0;i<6;i++) { try { Thread.sleep(500); } catch (InterruptedException e) { } g.setColor(c[i]); g.fillArc(240,120,500,500,(int)s[i],(int)an[i]); } } public static void main(String args[]) throws Exception { new arc(); } } OUTPUT:

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/* 19. Write a java program that allows the user to draw lines, rectangles and ovals */ import java.applet.Applet; import java.awt.Graphics; public class Prog19 extends Applet { public void init(){ } public void start() { } public void paint(Graphics g) { g.drawLine(10,10,210,10); g.drawRect(20,20, 180,180); g.drawOval(40,40,130,140); g.drawOval(220,220,70,50); } public void stop() { } public void destroy() { } } /* */ OUTPUT:

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//20. Client program to send radius to server import java.io.*; import java.util.*; import java.net.*; public class Client { public static void main(String args[]) throws IOException { Socket s=new Socket(InetAddress.getLocalHost(),8000); Scanner sc=new Scanner(System.in); Scanner scr=new Scanner(s.getInputStream()); PrintWriter out=new PrintWriter(s.getOutputStream(),true); while(true) { System.out.println("Enter radius of circle:"); double r=sc.nextDouble(); System.out.println("Radius sent to client is:"+r); out.println(r); System.out.println("Ariea is recieved.."); System.out.println("Area is:"+scr.nextDouble()); } } } // server program import java.io.*; import java.util.*; import java.net.*; public class Server { public static void main(String args[]) throws IOException { System.out.println("Server is started"); ServerSocket ss=new ServerSocket(8000); Socket s=ss.accept(); System.out.println("Connection from***: "+s+" *** "); Scanner in=new Scanner(s.getInputStream()); PrintWriter pw=new PrintWriter(s.getOutputStream(),true); while(true) { double r=in.nextDouble(); System.out.println("Radius recived from client is:"+r); double a=Math.PI*r*r; pw.println(a); System.out.println("Area is sent to client...:"+a); }

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} } OUTPUT:

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/*21. Write a java program that illustrates how run time polymorphism is achieved */ class A { public void show() { System.out.println("Inside class A and method show"); } } class B extends A { public void show() { System.out.println("Inside class B and method show"); } } class C extends B { public void show() { System.out.println("Inside class C and method show"); } } class RunPoly { public static void main(String args[]) { A a=new A(); B b=new B(); C c=new C(); a.show(); b.show(); c.show(); A ref; ref=b; ref.show(); ref=c; ref.show(); } } /* OUTPUT: C:\>javac RunPoly.java C:\>java RunPoly Inside class A and method show Inside class B and method show Inside class C and method show Inside class B and method show Inside class C and method show */

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