Table of Contents
Two Dimensional Array in Java
In this tutorial, we will discuss the Two Dimensional Array in Java language.
In this post, we will learn how to define the two-dimensional array and how to use it
To understand the two-dimensional array, we can be defined as the appropriate words as an array of array
Declaration of two-dimensional array
Syntex
Two dim arrays can declare the following methods
dataType[][] arrayname; —— 1 or
dataType [][]arrayname; ——- 2 or
dataType arrayname [][]; —— 3 or
you can choose any one method
Example for Two dim array declaration
int [][] array;
Creation of two-dimensional array
Syntax
datatype[row count][coloum count] arrayname=new datatype;
Example of Creation of Twodimensional array
array=new int[5][5]; //5 row and 5 coloum
The default value of array
Find the default value of the two-dimensional array after declaring a two-dimensional array
class ArrayWithForTwoDimdefault{
public static void main (String args[]){
int arr[][]=new int[4][3];//array declaration
System.out.print("\ndisplay cell value in an array: \n");
for(int i=0; i<4; i++){
for(int j=0; j<3; j++){
System.out.print("\ndisplay Element index["+i+"]["+j+"]:"+arr[i][j] );
}
}
}
}
When the above code is executed it produces the following result
initiation of Two dimm array
1.Standered metod
array[0][0]=66;
array[0][1]=54;
array[0][2]=36;
array[0][3]=59;
array[0][4]=50;
array[1][0]=55;
array[1][1]=59;
array1][2]=54;
array[1][3]=59;
array[1][4]=96;
Examples 1
class arr{
public static void main(String args[]){
int[][] x;
x=new int[6][2];
x[0][0]=34;
x[0][1]=56;
x[1][0]=77;
x[1][1]=73;
x[2][0]=14;
x[2][1]=15;
x[3][0]=16;
x[3][1]=07;
x[4][0]=18;
x[4][1]=19;
x[5][0]=25;
x[5][1]=26;
System.out.println(x[0][0]);
System.out.println(x[0][1]);
System.out.println(x[1][0]);
System.out.println(x[1][1]);
System.out.println(x[2][0]);
System.out.println(x[2][1]);
}
}
When the above code is executed it produces the following result
Examples 2
class Arraylast{
public static void main(String args[]){
int[][] x;
x=new int[6][2];
x[0][0]=10;
x[0][1]=11;
x[1][0]=12;
x[1][1]=13;
x[2][0]=14;
x[2][1]=15;
x[3][0]=16;
x[3][1]=17;
x[4][0]=18;
x[4][1]=19;
x[5][0]=20;
x[5][1]=21;
for(int i=0;i<=5;i++)
{
for (int j=0;j<=1;j++)
{
System.out.println(x[i][j]);
}
}
}
When the above code is executed it produces the following result
Initialize during the declaration
int[][] arr={
{45,76,98,65},
{36,78,76,55},
{56,66,56,24},
};
Example
class ArrayTwoDim{
public static void main(String args[]){
int[][] arr={
{45,76,98,65},
{36,78,76,55},
{56,66,48,24},
};
//first row of elements
System.out.println(arr[0][0]);
System.out.println(arr[0][1]);
System.out.println(arr[0][2]);
System.out.println(arr[0][3]);
System.out.println();
//second row of elements
System.out.println(arr[1][0]);
System.out.println(arr[1][1]);
System.out.println(arr[1][2]);
System.out.println(arr[1][3]);
System.out.println();
//third row of elements
System.out.println(arr[2][0]);
System.out.println(arr[2][1]);
System.out.println(arr[2][2]);
System.out.println(arr[2][3]);
}
}
When the above code executed it produces the following output
Initialize and display elements to the array using loops
Using the for loop
import java.util.Scanner;
class ArrayWithForTwoDim{
public static void main (String args[]){
Scanner scan=new Scanner(System.in);
System.out.print("Enter the row length for an array: ");
int row=scan.nextInt();
System.out.print("Enter the coloum length for an array: ");
int column=scan.nextInt();
int arr[][]=new int[row][column];//array declaration
System.out.print("\nEnter "+row*column+" Element to two dim array: \n");
for(int i=0; i<row; i++){
for(int j=0; j<column; j++){
arr[i][j]=scan.nextInt();
}
}
System.out.print("\ndisplay Element in an array: \n");
for(int i=0; i<row; i++){
for(int j=0; j<column; j++){
System.out.print("\ndisplay Element Row["+i+"]:column["+j+"]:"+arr[i][j] );
}
}
}
}
When the above code executed it produces the following output
Using the while loop
import java.util.Scanner;
class ArrayWithWhileTwoDim{
public static void main (String args[]){
Scanner scan=new Scanner(System.in);
System.out.print("Enter the row length for an array: ");
int row=scan.nextInt();
System.out.print("Enter the coloum length for an array: ");
int column=scan.nextInt();
int arr[][]=new int[row][column];//array declaration
System.out.print("\nEnter "+row*column+" Element to two dim array: \n");
int i=0;
while( i<row){
int j=0;
while( j<column){
arr[i][j]=scan.nextInt();
j++;
}
i++;
}
System.out.print("\ndisplay Element in an array: \n");
i=0;
while( i<row){
int j=0;
while( j<column){
System.out.print("\ndisplay Element Row["+i+"]:column["+j+"]:"+arr[i][j] );
j++;
}
i++;
}
}
}
When the above code executed it produces the following output
Using the do-while loop
import java.util.Scanner;
class ArrayWithDoWhileTwoDim{
public static void main (String args[]){
Scanner scan=new Scanner(System.in);
System.out.print("Enter the row length for an array: ");
int row=scan.nextInt();
System.out.print("Enter the coloum length for an array: ");
int column=scan.nextInt();
int arr[][]=new int[row][column];//array declaration
System.out.print("\nEnter "+row*column+" Element to two dim array: \n");
int i=0;
do{
int j=0;
do{
arr[i][j]=scan.nextInt();
j++;
}while( j<column);
i++;
}while( i<row);
System.out.print("\ndisplay Element in an array: \n\n");
i=0;
do{
int j=0;
System.out.print("\nrow "+(i+1)+" elements");
do{
System.out.print("\ndisplay Element Row["+i+"]:column["+j+"]:"+arr[i][j] );
j++;
}while( j<column);
i++;
System.out.print("\n");
}while( i<row);
}
}
When the above code executed it produces the following output
Display output using for each loop in two dimension array
class arrayforeach{
public static void main (String args[]){
int[]array[]=new int[3][3];
array[0][0]=87;
array[0][1]=67;
array[0][2]=07;
array[1][0]=83;
array[1][1]=88;
array[1][2]=81;
array[2][0]=67;
array[2][1]=74;
array[2][2]=828;
for(int i[]:array){
for(int j:i){
System.out.println(j);
}
}
}
}
When the above code executed it produces the following output
Output
87
67
7
83
88
81
67
74
828
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