Arrays

Array Declaration Syntax:

dataType arrayName[] = new dataType[size];

For example,

int marks[] = new marks[10];

int []marks = new int[10];

// Here, int[] becomes a data type
int[] marks = new int[10];

// So, we can create multiple arrays
int[] marks, values;
marks = new int[10];
values = new int[10];


int marks[] = {10, 20 ,30};

String fruits[] = {"Banana", "Mango", "Apple"};

Array Length

System.out.println(marks.length);

For each loop

We can also use For each loop to access the elements of the array

int A[] = {2, 4, 6, 8, 10};

for(int x : A) {
    System.out.println(x);
}

It will access each element of the array.

For each loop will only access the array elements, it will not modify the acutal array.

2D Array

int A[][] = new int[3][4];

int [][]A = new int[3][4];

int []A[] = new int[3][4];

// Here, int[] becomes a data type
int[] A[] = new int[3][4];

int[] B[], C[];
B = new int[3][4];
C = new int[3][4];

// Here, int[][] becomes a data type
int[][] A = new int[3][4];

int[][] B, C;
B = new int[3][4];
C = new int[3][4];

int A[][] = {{1,2,3,4}, {2,4,6,8}, {3,6,9,12}};

Consider this tricky array declaration:

int[] A, B[];

A = new int[10];
B = new int[3][4];

Here, A is 1D array and B is 2D array.

Accessing Array Elements

for(int x[] : A) {
    for(int y : x) {
        System.out.print(y);
    }
    System.out.print("\n");
}

Last modified: 08 February 2026