Java: Test that a given array of integers of length 2 contains a 4 or a 7

Last update on May 12 2025 13:17:22 (UTC/GMT +8 hours)

Contains 4 or 7

Write a Java program to test that a given array of integers of length 2 contains a 4 or a 7.

Sample Solution:

Java Code:

import java.util.Arrays;

public class Exercise78 {
    public static void main(String[] args) {
        // Define an integer array, array_nums
        int[] array_nums = {5, 7};
        
        // Print the elements of the original array
        System.out.println("Original Array: " + Arrays.toString(array_nums)); 
        
        // Check if the first element of the array is 4 or 7 and print the result
        if (array_nums[0] == 4 || array_nums[0] == 7) {
            System.out.println("True");
        } else {
            // If the first element is not 4 or 7, check the second element and print the result
            System.out.println(array_nums[1] == 4 || array_nums[1] == 7);
        }
    }
}

Sample Output:

Original Array: [5, 7]                                                 
true 

Pictorial Presentation:

Flowchart:

For more Practice: Solve these Related Problems:

• Modify the program to check if the array contains 3 or 9 instead.
• Write a program to check if an array contains only prime numbers.
• Modify the program to count how many times 4 or 7 appear in the array.
• Write a program to check if all elements in an array are either 4 or 7.

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