Normally, an array is a collection of similar type of elements that have a contiguous memory location.

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Java Array: Nrmally, an array is a cllectin f similar type f elements that have a cntiguus memry lcatin. Java array is an bject which cntains elements f a similar data type.

1 Java Array: Nrmally, an array is a cllectin f similar type f elements that have a cntiguus memry lcatin. Java array is an bject which cntains elements f a similar data type. It is a data structure where we stre similar elements. We can stre nly a fixed set f elements in a Java array. Array in java is index-based, the first element f the array is stred at the 0 index. Advantages Cde Optimizatin: It makes the cde ptimized, we can retrieve r srt the data efficiently. Randm access: We can get any data lcated at an index psitin. Disadvantages Size Limit: We can stre nly the fixed size f elements in the array. It desn't grw its size at runtime. T slve this prblem, cllectin framewrk is used in Java which grws autmatically. Types f Array in java There are tw types f array. Single Dimensinal Array Multidimensinal Array

2 Single Dimensinal Array in Java Syntax t Declare an Array in Java datatype[] arr; (r) datatype []arr; (r) datatype arr[]; Example f Java Array: //Java Prgram t illustrate hw t declare, instantiate, initialize, and traverse the //Java array. class Testarray{ public static vid main(string args[]){ int a[]=new int[5];//declaratin and instantiatin a[0]=10;//initializatin a[1]=20; a[2]=70; a[3]=40; a[4]=50; //traversing array fr(int i=0;i<a.length;i++) //length is the prperty f array System.ut.println(a[i]);

3 Passing Array t Methd in Java We can pass the java array t methd s that we can reuse the same lgic n any array. Let's see the simple example t get the minimum number f an array using a methd. //Java Prgram t demnstrate the way f passing an array t methd. class Testarray2{ //creating a methd which receives an array as a parameter static vid min(int arr[]){ int min=arr[0]; fr(int i=1;i<arr.length;i++) if(min>arr[i]) min=arr[i]; System.ut.println(min); public static vid main(string args[]){ int a[]={33,3,4,5;//declaring and initializing an array min(a);//passing array t methd 3

4 Returning Array frm the Methd We can als return an array frm the methd in Java. //Java Prgram t return an array frm the methd class TestReturnArray{ //creating methd which returns an array static int[] get(){ return new int[]{10,30,50,90,60; public static vid main(string args[]){ //calling methd which returns an array int arr[]=get(); //printing the values f an array fr(int i=0;i<arr.length;i++) System.ut.println(arr[i]); Multidimensinal Array in Java In such case, data is stred in rw and clumn based index (als knwn as matrix frm). Syntax t Declare Multidimensinal Array in Java datatype[][] arrayrefvar; (r) datatype [][]arrayrefvar; (r) datatype arrayrefvar[][]; (r) datatype []arrayrefvar[];

5 Example f Multidimensinal Java Array //Java Prgram t illustrate the use f multidimensinal array class Testarray3{ public static vid main(string args[]){ //declaring and initializing 2D array int arr[][]={{1,2,3,{2,4,5,{4,4,5; //printing 2D array fr(int i=0;i<3;i++){ fr(int j=0;j<3;j++){ System.ut.print(arr[i][j]+" "); System.ut.println();

6 Additin f 2 Matrices in Java //Java Prgram t demnstrate the additin f tw matrices in Java class Testarray5{ public static vid main(string args[]){ //creating tw matrices int a[][]={{1,3,4,{3,4,5; int b[][]={{1,3,4,{3,4,5; //creating anther matrix t stre the sum f tw matrices int c[][]=new int[2][3]; //adding and printing additin f 2 matrices fr(int i=0;i<2;i++){ fr(int j=0;j<3;j++){ c[i][j]=a[i][j]+b[i][j]; System.ut.print(c[i][j]+" "); System.ut.println();//new line

7 int[][] a = new int[3][4]; Here, a is a tw-dimensinal (2d) array. The array can hld maximum f 12 elements f type int.

History of Java. VM (Java Virtual Machine) What is JVM. What it does. 1. Brief history of Java 2. Java Version History

History of Java. VM (Java Virtual Machine) What is JVM. What it does. 1. Brief history of Java 2. Java Version History Histry f Java 1. Brief histry f Java 2. Java Versin Histry The histry f Java is very interesting. Java was riginally designed fr interactive televisin, but it was t advanced technlgy fr the digital cable