Java Programs to illustrate Array Operations

             Array is a collection of similar data items. Genarally,operations on array includes finding a maximum number in array, reversing the array elements, sorting and searching.

This blog includes two java programs to illustrate array operations.

1.Java Program to find biggest number in the array:

              This program includes the below steps.

• ·       Include the built in package java.util.Scanner.
• ·       A public class MaxElement is created with main() function.
• ·       Read the number of elements in an array as input.
• ·       Using a loop(for loop), get all the elements to array.
• ·       Set a variable max to first element of array.
• ·       Check each element with max value to find the biggest value.
• ·       If the array element is greater than max, set the max as array element.
• ·       otherwise, repeat the process.
• ·       Finally, print the maximum value of the array.

#Java program to find the biggest array element.

import java.util.Scanner;

public class MaxElement {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        System.out.print("Enter the number of elements");

        int no = scanner.nextInt(); // Read the number of elements

        int[] a = new int[no]; // Array declaration

        int j=0;

        System.out.println("Enter " + no + " elements: ");

        for (j = 0; j< no; j++) {

            a[j] = scanner.nextInt(); // get the array elements

        }

         int max = a[0];

        for (int num : a) {

            if (num > max) {

                max = num;

            }

        }

        System.out.println("The Biggest array element is:"+max);

     }

}

The output is as follows….

C:\raji\blog>javac MaxElement.java

C:\raji\blog>java MaxElement

Enter the number of elements 5

Enter 5 elements:

11

23

76

45

18

The Biggest array element is:76

Next program is to reverse the elements in array.

2.Java Program to reverse the elements in the array:

              This program is to reverse the elements from the beginning to last.

Steps:👇

• As a beginning, import the built in package java.util.scanner.
• A class is created with main() function.
• First,get the number of elements of the array.
• Read the array elements.
• Declare the two variables as Sta and end. Using this variables, repeat the process from starting element to last element to reverse the array.
• Finally,print the array reversed.

#Java Program to reverse the elements in the array:

import java.util.Scanner;

public class ReverseElement {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        System.out.print("Enter the number of elements");

        int no = scanner.nextInt(); // Read the number of elements

        int[] a = new int[no]; // Array declaration

        int j=0;

        System.out.println("Enter " + no + " elements: ");

        for (j = 0; j< no; j++) {

            a[j] = scanner.nextInt(); // get the array elements

        }

       int sta = 0;

        int end = a.length - 1;

        while (sta < end) {

            int temp = a[sta];

            a[sta] = a[end];

            a[end] = temp;

            sta++;

            end--;

        }

      System.out.print("The Reversed array is:");

      System.out.println("");

      for(j=0;j<no;j++)

      {

       System.out.println(a[j]);

     }

 }

}

Output:

C:\raji\blog>javac ReverseElement.java

C:\raji\blog>java ReverseElement

Enter the number of elements5

Enter 5 elements:

54

34

23

67

87

The Reversed array is:

87

67

23

34

54

These are the java programs to perform array operations. Keep coding!!!!