# Java Program to Print 3×3 Matrix

Java Program to Print 3×3 Matrix | Print 3×3 Matrix using loops | Program to display 3×3 Matrix using Arrays.deepToString().

To print or display a 3×3 matrix we can use nested loops, it can be either for loop, for-each loop, while loop, or do-while loop. We have another better alternative deepToString() which is given in java.util.Arrays class. First, let us see the Java program using loops.

## Java Program to Print 3×3 Matrix using for loop

``````public class DisplayMatrix {

public static void main(String[] args) {
// declare and initialize a 3x3 matrix
int matrix[][] =
{ { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 } };

// display matrix using for loops
// outer loop for row
for(int i=0; i<matrix.length; i++) {
// inner loop for column
for(int j=0; j<matrix[0].length; j++) {
System.out.print(matrix[i][j] + " ");
}
System.out.println(); // new line
}
}

}``````

Output:-

1 2 3
4 5 6
7 8 9

In this program matrix.length returns the row size and matrix[0].length returns the size of the column. See more:- How to find the length of the array in Java. Since we are assuming that the given matrix is of 3×3 matrix, therefore, is no need to calculate the row and column size, directly place 3.

``````// display matrix using for loops
for(int i=0; i<3; i++) {
for(int j=0; j<3; j++) {
System.out.print(matrix[i][j] + " ");
}
System.out.println(); // new line
}``````

The for-each or enhanced for loop was introduced in Java 1.5 version. Below is the Java program to display the 3×3 matrix using the for-each loop.

``````public class DisplayMatrix {

public static void main(String[] args) {
// declare and initialize a 3x3 matrix
int matrix[][] =
{ { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 } };

// display 2D array using for-each loop
for(int[] i : matrix) {
for(int j : i) {
System.out.print(j + " ");
}
System.out.println(); // new line
}
}

}``````

Output:-

1 2 3
4 5 6
7 8 9

## Java Program to Print 3×3 Matrix using Arrays.deepToString() method

The java.util.Arrays class in Java contains several methods for basic array problems. It contains toString() method to display one-dimension array and deepToString() method to display the Java multi-dimensional array. Below program uses Arrays.deepToString() method to display the 3×3 matrix.

``````import java.util.Arrays;

public class DisplayMatrix {

public static void main(String[] args) {
// declare and initialize a 3x3 matrix
int matrix[][] =
{ { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 } };

// display 2D array using for-each loop
System.out.println(Arrays.deepToString(matrix));
}

}``````

Output:-

`[[`1, 2, 3`]`,` [`4, 5, 6`]`, `[`7, 8, 9`]]`

Java Program to take 3×3 matrix elements as input from the user and display it

``````import java.util.Arrays;
import java.util.Scanner;

public class DisplayMatrix {

public static void main(String[] args) {

// declare a 3x3 matrix
int matrix[][] = null ;
matrix = new int[3][3];

// create Scanner class object to read input
Scanner scan = new Scanner(System.in);

// read matrix
System.out.println("Enter 3x3 Matrix elements: ");
for(int i=0; i<3; i++) {
for(int j=0; j<3; j++) {
matrix[i][j] = scan.nextInt();
}
}

// display 2D array using for-each loop
System.out.println("Entered Matrix: ");
System.out.println(Arrays.deepToString(matrix));

// close Scanner
scan.close();
}

}``````

Output:-

Enter 3×3 Matrix elements:
10 20 30
40 50 60
70 80 90
Entered Matrix:
`[[`10, 20, 30`]`, `[`40, 50, 60`]`, `[`70, 80, 90`]]`

See more matrix programs in Java:-

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