Java Program to Check Number is Positive or Negative

Last Updated: 09 August, 2022

On this tutorial page we are going to learn how to write a Java program to check whether the number is positive or negative.

Please understand the below points before going through the Java program implementation:

If a number is greater than zero (number > 0), then that number is a positive.
For Example: 1, 2, 3, 4.....

If a number is less than zero (number < 0) then that number is a negative.
For Example: -1, -2, -3, -4.....

If a number is equal to zero (number == 0) then that number is not a positive or negative.
For Example: 0

Let's see the Java program implementation.

Program 1: Check whether the number is positive or negative

  public class PosiviteNegativeNumber {
    public static void main(String[] args) {
      isNumberPositiveOrNegative(50);
      isNumberPositiveOrNegative(-20);
      isNumberPositiveOrNegative(0);
    }
  
    static void isNumberPositiveOrNegative(int number) {
      // number is positive, if it is greater than 0
      if (number > 0)
        System.out.println(number + " is a positve number.");
  
      // number is negative, if it is less than 0
      else if (number < 0)
        System.out.println(number + " is a negative number.");
  
      // if number is not either positive or negative then it is 0
      else
        System.out.println("The number is 0.");
    }
  }

Program 2: Check whether the number is positive or negative using Scanner class (user input)

  
  import java.util.Scanner;
  public class PosiviteNegativeNumber2 {
    public static void main(String[] args) {
      Scanner scanner = new Scanner(System.in);
      System.out.print("Enter the number: ");
      double number = scanner.nextDouble();
      scanner.close();
      isNumberPositiveOrNegative(number);
    }
    
    static void isNumberPositiveOrNegative(double number) {
      // number is positive, if it is greater than 0
      if (number > 0.0)
        System.out.println(number + " is a positve number.");
      
      // number is negative, if it is less than 0
      else if (number < 0.0)
        System.out.println(number + " is a negative number.");
      
        // if number is not either positive or negative then it is 0
      else
        System.out.println("The number is 0.");
    }
  }