Question

Write a Java program that will use a two-dimensional array and modularity to solve the following tasks:

Create a method to fill the 2-dimensional array with (random numbers, range 0 - 30). The array has rows (ROW) and columns (COL), where ROW and COL are class constants.

Create a method to print the array.

Create a method to find the largest element in the array

Create a method to find the smallest element in the array

Create a method to find the sum of all elements in the array

Generate output similar to the sample output below.

Sample Output:

The matrix is:

   16    8   23   23

    8   22   28    9

   23   19    9   19

   27   16   27   14

    6   11   13   5

The max value for the entire matrix is: 28

Answer 1

package org;

import java.util.Random;

import java.util.Scanner;

public class Matrix {

int ROW;

int COLUMN;

public static void main(String[] args) {

// TODO Auto-generated method stub

Scanner sc=new Scanner(System.in);

Matrix m=new Matrix();

System.out.println("Enter number of rows: ");

m.ROW=sc.nextInt();

System.out.println("Enter number of columns: ");

m.COLUMN=sc.nextInt();

int[][] a=m.randomArray();

m.printArray(a);

m.largest(a);

m.smallest(a);

m.sum(a);

}

public void largest(int[][] a) {

// TODO Auto-generated method stub

int max=a[0][0];

for(int i=0;i<ROW;i++)

{

for(int j=0;j<COLUMN;j++)

{

if(a[i][j]>max)

{

max=a[i][j];

}

}

}

System.out.println("The largest element in the array is "+max);

}

public void smallest(int[][] a) {

// TODO Auto-generated method stub

int min=a[0][0];

for(int i=0;i<ROW;i++)

{

for(int j=0;j<COLUMN;j++)

{

if(a[i][j]<min)

{

min=a[i][j];

}

}

}

System.out.println("The smallest element in the array is "+min);

}

public void sum(int[][] a) {

// TODO Auto-generated method stub

int sum=0;

for(int i=0;i<ROW;i++)

{

for(int j=0;j<COLUMN;j++)

{

sum=sum+a[i][j];

}

}

System.out.println("The sum of the array is "+sum);

}

public void printArray(int[][] a) {

// TODO Auto-generated method stub

System.out.println("The array is: ");

for(int i=0;i<ROW;i++)

{

for(int j=0;j<COLUMN;j++)

{

System.out.print(a[i][j]+" ");

}

System.out.println();

}

}

public int[][] randomArray() {

// TODO Auto-generated method stub

int a[][]=new int[ROW][COLUMN];

Random r=new Random();

for(int i=0;i<ROW;i++)

{

for(int j=0;j<COLUMN;j++)

{

a[i][j]=r.nextInt(31);

}

}

return a;

}

}

Output: