Java: Check if an array of integers without two specified numbers

Last update on May 09 2025 12:48:30 (UTC/GMT +8 hours)

30. Check if array excludes 0 and -1

Write a Java program to check if an array of integers is without 0 and -1.

Pictorial Presentation:

Sample Solution:

Java Code:

// Import the java.util package to use utility classes, including Arrays.
import java.util.*;

// Import the java.io package to use input and output classes.
import java.io.*;

// Define a class named Exercise30.
public class Exercise30 {
    // The main method for executing the program.
    public static void main(String[] args) {
        // Declare and initialize an array of integers.
        int[] array_nums = {50, 77, 12, 54, -11};

        // Print the original array.
        System.out.println("Original Array: " + Arrays.toString(array_nums));

        // Call the test method with the array as an argument and print the result.
        System.out.println("Result: " + test(array_nums));
    }

    // Define a method named test that takes an array of integers as input.
    public static boolean test(int[] numbers) {
        // Use an enhanced for loop to iterate through the array elements.
        for (int number : numbers) {
            // Check if the current number is 0 or -1.
            if (number == 0 || number == -1) {
                // If any number is 0 or -1, return false.
                return false;
            }
        }
        // If no number is 0 or -1, return true.
        return true;
    }
}

Sample Output:

                                                                              
Original Array: [50, 77, 12, 54, -11]                                  
Result: true

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to check if an array contains only prime numbers.
• Write a Java program to check if an array contains only even numbers.
• Write a Java program to check if an array contains only numbers greater than a specified value.
• Write a Java program to check if an array contains no duplicates.

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