Chap 8

December 2019
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[modifier] dataType []variableName;

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[modifier] dataType variableName[];

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variableName = new dataType[size];

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dataType []variableName = new dataType[size];

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dataType variableName[] = new dataType[size];

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public class SimpleArrays { public static void main(String args[]) { int []x; x = new int[4]; x[0] = 0; x[1] = 2; x[2] = 4; x[3] = 6; System.out.println("x = "+x); System.out.println("x[0] = "+x[0]); System.out.println("x[1] = "+x[1]); System.out.println("x[2] = "+x[2]); System.out.println("x[3] = "+x[3]); } }

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dataType []variableName = {value1,value2,..,valueN};

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int []x = {4,3,5,1,8}; :;"='&,B6&(2'6D,@<:(/($E x RSB60%.='"@"&0'IA1 t D,@ !5$ %B x[0],x[1], x[2],x[3]<# x[4] 0%'H (AB0D2":;"u`c`t`P<#zD'0#='5,+ 1'(1='4"5H'(AB0D2"C/6D,@<:(/($E ='G52|-'9"='&,6B :(1')D,@<:( H'",8" ,86"%8('G0H&'0'(* .%B 1='4"5H'(AB0D2">'$4#,6.'1='&,B6:(1')D,@<:(/($EG52 1#H'@7/ ='&,B6 int []x; x[] = {4, 3, 5, 1, 8}; :;"='&,B6 G%B 0H*M1D2/6

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System.out.println(x[1]); System.out.println(x[2]); System.out.println(x[3]); System.out.println(x[4]);

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public class IncorrectArrays { public static void main(String args[]) { int []x = {4,3,5,1,8}; System.out.println(x[5]); } }

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private String name; public Student() { name = “NoName”; } public Student(String n) { name = n; } public String getName() { return name; }

}

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Student s1 = new Student(“Somsri”);

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public class Student { private String name; public Student(String n) { name = n; } public String getName() { return name; } } ------------------------------------------------------public class TestClassArrays { public static void main(String args[]) { Student []s = {new Student(“Thana”), new Student(“Somchai”), new Student(“Somsak”)}; for(int i=0; i<s.length; i++) { System.out.print(s[i].getName()+" "); } } }

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!:(<1(0 %B zQt.0%='&,B6 int[][]a = new int[5][5]; %B9I29"1'(&(2'6 D,@<:(/($E&/60ADA !5$0%H'C/6&0'IA1C/6/($E.'11'(&30H D,@#C.='"@"(4@H'6 m *S6 s .'1='&,6B a[i][j] = (int)(Math.random()*10); !:(<1(0"%8.9I2='&,6B for %B0%!(6&(2'6<++R2/"/$MH4#'$ %B ,86"%8 -7B/IH@$9"1'( .,51'(:(0@#W#C2/0M#C/6&0'IA1D,@<:(/($E #'&Matrices0%0L/55,6"%8 x

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class Matrices { int [][]m = new int[5][5]; public int[][] addMatrices(int[][] m1, int[][] m2) { for (int i=0; i<m1.length; i++) { for (int j=0; j<m1[i].length; j++) { m[i][j] = m1[i][j] + m2[i][j]; } } return m; } public int[][] mulMatrices(int[][] m1, int[][] m2) { int sum; for (int i=0; i<m1.length; i++) { for (int j=0; j<m1[i].length; j++) { sum = 0; for (int k = 0;k < m1[i].length; k++) { sum += m1[i][k] * m2[k][j]; } m[i][j] = sum; } } return m; } public void printMatrix(int[][] m) { for (int i=0; i<m.length; i++) { for (int j=0; j<m[i].length; j++) { System.out.print(m[i][j]+"\t"); } System.out.println(); } } } public class CalMatrices { public static void main(String args[]) { int [][]a = new int[5][5]; int [][]b = new int[5][5]; [][]c = new int[5][5]; int for (int i=0; i

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mt.printMatrix(a); System.out.println("Matrix B:"); mt.printMatrix(b); c = mt.addMatrices(a,b); System.out.println("Matrix A+B:"); mt.printMatrix(c); c = mt.mulMatrices(a,b); System.out.println("Matrix A*B:"); mt.printMatrix(c);

} }

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for(int i=0; i<x.length; i++) { for(int j=0; j<x[i].length; j++) { System.out.print(x[i][j]+" "); } System.out.println(); } } }

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sort():;"0L/5

x

binarySearch()

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C/6/($E "7B/6.'10L/5 ,86&'00L/5 1%B #H'@0'C2'6D2":;"0L/5<++ static 5,6",8"1'( (%$19I26'"0L/54#H'"%8.S6&'0'(*(%$1!5$9I2I7B/#'& ArraysG52#$G0H.=':;"D2/6&(2'6 //:.KC/6#'&ArraysCS"8 0'1H/"1'((%$19I26'" !:(<1(0 %B zQv <&56D,@/$H'61'((%$19I20L/5C/6#'& Arrays %B1#H'@G@2 C2'6D2"!:(<1(0"%8 (%$19I20L/5sort()!5$&H6 %B:;"D,@<:(/($EdG:

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.:;"='&,6B 9"1'(:(1')D,@<:(/($E x <#&(2'6/($E-(2/01,+1='4"5H' (AB0D2"9421,+&0'IA1 6,8 D,@C/6/($E!5$0%H'C2/0M#:;"I#<#* D'0#='5,+

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4! 6 W##,-LE %BG52.'11'((,"!:(<1(0 %BzQv >'?'.'@'0%='&,6B System.arraycopy() 9I2&='4(,+,5#/1H'C2/0M#C/6 &0'IA1C/6/($E!5$0%!(6&(2'6(M:<++='&,6B 5,6"%8 System.arraycopy(Object src,int src_pos, Object dst,int dst_pos,int length); !:(<1(0 %B zQz <&56D,@/$H'61'(9I2='&,6B System.arrayCopy() !5$&H6 ,0^2;871 RSB6:;"D,@<:(/($E scr RSB6:;"/($ED2"<++ (A0B .'1H'C2/0M#C/6&0'IA1 #='5,+ %B C/6/($E src G:$,6&0'IA1#='5,+ %B 0 C/6/($E dst !5$942 ='1'(,5#/1 C2/0M# ,86&A8"H'C2/0M#!5$!:(<1(0"%.8 G52W##,-LE5,6<&569"(M: %BzQPP ("' 4!4D,@/$H'61'(9I2='&,B6System.arraycopy(); public class CopyArrays { public static void main(String args[]) { String []scr = {"Copy","an","array","from", " source"," to"," destination."}; String []dst = new String[4]; System.arraycopy(scr,3,dst,0,4); for(int i=0; i
System.out.print(dst[i]); } System.out.println(); } }

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x Set:;"/A"D/(EJ& %B9I2 implements#'&:(> /##K1I,B" 0%B &% 0'IA1 %B0%C2/0M#G0HR8='1,"<#G0H0#% ='5,+1'(9&HC2/0M#

x List :;"/A"D/(EJ& %B9I2 implements #'&:(> /##K1I,B" %B0% &0'IA1RSB6/'.0%C2/0M#R8='1,"G52
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4! $/A"D/(EJ&<##'&DH'6F9"_=33851/=7PHQ

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x boolean remove (Object element) :;"0L/5 9%B I29"1'(#+&0'IA1//1.'1/##K1I,B" !5$D2/6&H6WH'" %B:;"//:.K D%B 2/61'(#+//1 0L/5"%8.&H6H'1#,+0':;"I"A5C2/0M#<++ boolean!5$.942H':;"true9"1(% %B#+C2/0M#G52

x int size() :;"0L/5 9%B I29"1'(4'.='"@"&0'IA1 0%B %/$M9H "/##K1I,B"

x boolean isEmpty() :;"0L/5 9%B I29"1'(D(@.@H'/##K1I,B"0%&0'IA1/$MH4(7/G0H !5$.&H6H'1#,+0' :;"true*2'G0H0%&0'IA1/$M9H "/##K1I,B"

x boolean

contains(Object element)

:;"0L/5 9%B I29"1'(D(@.&/+@H' /##K1I,B"0%&0'IA1 %B0%'H :;"//:.KC/6 %B&6H WH'"0'4(7/G0H

x Iterator iterator() :;"0L/5 9%B I29"1'(<.1<.6C2/0M#C/6&0'IA19"/##K1I,B"

84 2Set Set :;"/A"D/(EJ&

B&% +7 /50'.'1/A"D/(EJ& Collection !5$0%#'& %B &=',n %B implements/A"D/(EJ&"%87/#'& HashSet#'& HashSet9I29"1'( &(2'6//:.K:(> /##K1I,"B RSB6.0%&0'IA1C/6C2/0M#R8='1,"G0HG52 !:(<1(0 %B zQs <&56 D,@/$H'61'(9I2#'& HashSet !:(<1(0"%8.D2/60%='&,6B import java.util.*; -7B/ %B.(%$19I2#'&DH'6F %B1'= 4"59" _=33851/=7 PHQ !:(<1(0"%8G52&(2'6//:.K s RSB6 :;"//:.KC/6#'& HashSet<#(%$19I20L/5 add()9"1'(9&HC2/0M##69"//:.K s!5$:1DA<#2@ C/60L/5add().D2/6:;"//:.KC/6#'& I %B 7B/Object
("' 4!5 D,@/$H'61'(9I2#'&HashSet import java.util.*; public class SampleSet { public static void main(String args[]) { Set s = new HashSet(); s.add("C#"); s.add("Java"); s.add("Pascal"); System.out.println("The size of this set is "+ s.size()); System.out.println("The contents are "+s); System.out.println("Removing C#"); s.remove("C#"); System.out.println("Now this set contains C#: "+ s.contains("C#")); s.add("Java"); System.out.println("Now the size is "+s.size()); System.out.println("The contents are "+s); } }

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x Object remove(int index) :;"0L/59"1'(#+&0'IA1#='5,+ %BRSB60%#C.='"@"DK09" index//1.'1/##K1I,B"

x Object get(int index) 0L/5"%89I29"1'((%$1C2/0M#C/6&0'IA1#='5,+ %B0%#C.='"@"DK09" %B I7B/index

x int indexOf(Object element) 0L/5"%89I29"1'(D(@.&/+@H'//:.K 0%B %H'9" &0'IA1#='5,+ %B H'G(C/6/##K1I,B"

x ListIterator listIterator() 0L/5"%89I29"1'(<.1<.6C2/0M#C/6&0'IA19"/##K1I,B"<++List

%BI7B/

%B&H6WH'"0':;"

#'&&=',n %B implements/A"D/(EJ& List RSB6(+3G@29"_=33851/=7PHQ7/ #'& LinkedList <# ArrayList !:(<1(0 %B zQPm <&56D,@/$H'61'(9I2#'& LinkedList!:(<1(0"%. 8 0%='&,6B l.get(0):;"1'((%$1C2/0M#C/6&0'IA1#='5,+ %B m 9"//:.Kl %B:;"//:.KC/6#'&LinkedList&H@"='&,B6l.indexOf(“Java”) :;"='&,B6(%$15M#='5,+ C%B /6&0'IA19"//:.K l RSB60%C2/0M#:;"//:.K String %B0% C2/@'09" “Java” !:(<1(0"%8<&56D,@/$H'6C/6C2/ Set <#List ,86"%8.4K"G52.'1='&,B6l.add(“Java”)&'0'(* %B.9&HC2/0M# %BR8='1,"G52!5$ !:(<1(0.G52W##,-LE5,6<&569"(M: %BzQPu ("' 4! 6D,@/$H'61'(9I2#'&LinkedList import java.util.*; public class SampleList { public static void main(String args[]) { List l = new LinkedList(); l.add("C#"); l.add("Java"); l.add("Pascal"); System.out.println("The size is "+l.size()); System.out.println("The contents are "+l); System.out.println("The first one is "+l.get(0)); l.add("Java"); System.out.println("The contents are "+l); System.out.println("The index of Java is "+ l.indexOf("Java")); } }

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x Object put(Object key, Object value) :;"0L/5 9%B I29"1'(9&H&0'IA1#69"/##K1I,B"!5$D2/69&H//:.K ,86&H@" %B :;" %$E<#&H@" %B :;"C2/0M#D'0 %BI7B/key<#valueD'0#='5,+

x Object remove(Object key) :;"0L/5 9%B I29"1'(#+&0'IA1//1.'1/##K1I,B" !5$&0'IA1 %B*M1#+.0%H' C/6%$E :;"//:.K %B0%H'D'0 %BI7B/key

x Object get(Object key) :;"0L/5 9%B I29"1'((%$15MC2/0M#C/6&0'IA19"/##K1I,B" %B0% H'C/6%$E :;"H' C/6//:.K %BI7B/key %BWH'"0'$,6

x Set entrySet() :;"0L/5 9%B I2(%$15MC2/0M#C/6&0'IA1 6,8 4059"/##K1I,B"

x Set keySet() :;"0L/5 9%B I2(%$15M$% EC/6&0'IA1 ,864059"/##K1I,B"

x int size() :;"0L/5 9%B I29"1'(4'.='"@"&0'IA1C/6/##K1I,B" #'& &%B =',n %Bimplements/A"D/(EJ&Map7/#'&HashMap!:(<1(0 %B zQPP<&56D,@/$H'61'(&(2'6//:.KC/6#'&"%8<#2@(%$19I20L/5 put()9"1'(9&H&0'IA1 #69"/##K1I,B" ,86"%8 0L/5"%8.D2/6&H6WH'" &/6D,@9" %B"%8 6,8 &/6D,@.&H6WH'"//: .KI"A5 String 0L/5 remove() 9" %B".%8 9I29"1'(#+&0'IA1 0%B %H'C/6%$E :;" String %B0%H':;"c!:(<1(0"%8.942W##,-LE5,6<&569"(M: %BzQPt

("' 4! D,@/$H'61'(9I2#'&HashMap import java.util.*; public class SampleMap { public static void main(String args[]) { Map m = new HashMap(); m.put("1","C#"); m.put("2","Java"); m.put("3","Pascal"); System.out.println("Removing Pascal"); m.remove("3"); System.out.println("The size is "+m.size()); System.out.println("The first one is "+ m.get("1")); m.put("3","Java"); System.out.println("The key of this map are "+ m.keySet()); System.out.println("The contents are "+ m.entrySet()); } }

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x boolean

hasNext()

!"!#$%&'(&" )&*'+," !"!#$%-(./01#2'.2'3 4'(#'51(+,6

:;"0L/5 .%B D(@.&/+@H'$,60%C2/0M#/$M9H "Iterator/%14(7/G0H

x Object next() :;"0L/5 .%B (%$15MH'C/6//:.KC/6&0'IA1D,@*,5G:C/6 Iterator!5$ .&H6H'1#,+0':;"//:.KC/6#'& %BI7B/Object

x void remove() :;"0L/5 9%B I29"1'(#+&0'IA1D='<4"H6:]..3+,"//1.'1Iterator !5$ @,B G:D='<4"H6(AB0D2"C/6 Iterator .I%8G: D%B '= <4"H61H/"&0'IA1C/6 Iterator D,@<(1<#.9I20L/5 next() 9"1'((%$15M&0'IA1D,@DH/FG: !:(<1(0 %B zQP <&56D,@/$H'61'(9I2/A"D/(EJ& Iterator 9"1'((%$15MC2/0M#C/6&0'IA1C/6 //:.KI"A5ArrayList!:(<1(0"%8.942W##,-LE5,6<&569"(M: %BzQP

("' 4! $D,@/$H'61'(9I2/A"D/(EJ&Iterator import java.util.*; public class SampleIterator { public static void main(String args[]) { Set scrSet = new HashSet(); scrSet.add("C#"); scrSet.add("Java"); scrSet.add("Pascal"); Iterator it = scrSet.iterator(); Set dstSet = new HashSet(); for(int i=0; i<scrSet.size(); i++) { if(it.hasNext()) { dstSet.add(it.next()); } } System.out.println(dstSet); } }

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ListIterator

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x boolean hasMoreElement() :;"0L/5 9%B I29"1'(D(@.&/+@H'$,60%&0'IA19"Enumeration/%14(7/G0H

x Object nextElement() :;"0L/5 9%B I29"1'((%$15MH'C/6&0'IA19" Enumeration %B/$MH9"D='<4"H6 *,5G: !5$ @,B G:1'((%$15MH'C/6&0'IA1C/6//:.K:(> Enumeration .0% (M:<++C/6='&,B65,6"%8 while(e.hasMoreElements()){ System.out.print(e.nextElement()+“ ”);

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}

844 #Vector

Vector

:;"#'&:(> /##K1I,B" %B1='4"5G@29" _=33851/=7 PHQ #'& Vector 9I21K+1#3H0C/6//:.KC/6#'&95F !5$G0H.='1,5.='"@" #'& Vector :;" #'& %B implements /A"D/(EJ& List ('&'0'(*&(2'6//:.KC/6#'& Vector !5$(%$19I2X X 9"(M:<++DH'6F5,6"%8 x

Vector()

x

Vector(int initialCapacity)

x

Vector(int initialCapacity, int capacityIncrement)

!5$ %B x

initialCapacity7/C"'5(AB0D2"C/6Vector

x capacityIncrement7/C"'5 %B.-AB0CS8"07B/Vector0%C"'5DK0<#2@ !:(<1(0 %BzQPc :;"D,@/$H'61'(9I2//:.KC/6#'&Vector<#9I2/A"D/(EJ& Enumeration9"1'((%$15MC2/0M#!:(<1(0"%8.942W##,-LE5,6<&569"(M: %BzQPv ("' 4! %D,@/$H'61'(9I2//:.KC/6#'&Vector import java.util.*; public class SampleEnumeration { public static void main(String args[]) { Vector v = new Vector(); v.add("C#"); v.add("Java"); v.add("Pascal"); Enumeration e = v.elements(); while (e.hasMoreElements()) { System.out.print(e.nextElement()+" } } }

");

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Arrays

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sort(),

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Collection,

Set,

List

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!"!#$%&'(&" )&*'+," !"!#$%-(./01#2'.2'3 4'(#'51(+,6

Chap 8

Overview

More details

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