Processing2DArrays

import java.util.Random;
import java.util.Scanner;

public class Processing2DArrays {

    public static void main(String[] args) {
        int [][] matrix;
        matrix=new int[3][3];
        matrix[0][0]=1;matrix[0][1]=2;matrix[0][2]=3;
        matrix[1][0]=4;matrix[1][1]=5;matrix[1][2]=6;
        matrix[2][0]=7;matrix[2][1]=8;matrix[2][2]=9;
        // OR

        int [][] matrix1={
                {10,20,30},
                {40,50,60},
                {70,80,90},
        };
        // to make matrix by input values

        Scanner kb= new Scanner(System.in);
        int [][] matrix2;
        matrix2= new int[3][3];
        System.out.println("Enter " +matrix2.length + " rows and "+ matrix[0].length+ " columns");
        for (int i=0; i<matrix2.length; i++){
            for (int j=0; j<matrix2[0].length; j++){
                matrix2[i][j]=kb.nextInt();
            }
        }
        // to make matrix with random values
        int [][] matrix3;
        matrix3=new int[3][3];
        for (int i=0; i<matrix3.length; i++){
            for (int j=0; j<matrix3[0].length; j++){
                matrix3[i][j]=(int)(Math.random()*100);
            }
        }
        // OR
        Random ran = new Random();
        int [][] matrix4;
        matrix4=new int[3][3];

        for (int i=0; i<matrix4.length; i++){
            for (int j=0; j<matrix4[0].length; j++){
                matrix4[i][j]=ran.nextInt(100);
            }
        }
        // print the arrays
        for (int i=0; i<matrix.length; i++){
            for (int j=0; j< matrix[0].length; j++){
                System.out.print(matrix[i][j]+ " ");
            }
            System.out.println();
        }
        System.out.println();// space between these 2
            for (int i=0; i<matrix1.length; i++){
                for (int j=0; j< matrix1[0].length; j++){
                    System.out.print(matrix1[i][j]+ " ");
                }
                System.out.println();
            }
        System.out.println();// space between these 2
        for (int i=0; i<matrix2.length; i++){
            for (int j=0; j< matrix2[0].length; j++){
                System.out.print(matrix2[i][j]+ " ");
            }
            System.out.println();
        }
        System.out.println();// space between these 2
        for (int i=0; i<matrix3.length; i++){
            for (int j=0; j< matrix3[0].length; j++){
                System.out.print(matrix3[i][j]+ " ");
            }
            System.out.println();
        }
        System.out.println();// space between these 2
        for (int i=0; i<matrix4.length; i++){
            for (int j=0; j< matrix4[0].length; j++){
                System.out.print(matrix4[i][j]+ " ");
            }
            System.out.println();
        }


    }

}