How to Get the Square of a Double Value in Java

1. Get Square by Multiplying in Java
2. Get Square by Math.pow() Method in Java

This tutorial introduces the ways to get the square of a double value in Java.

The square of a number is a product of the number (itself). For example, a square of 2 is 4 (2*2). In Java, we can use several ways to get the square of any number, such as a built-in method of the Math package or custom code.

This article will teach us to get the square of a double value in Java by using either a built-in method or our custom code. Let’s start with some examples.

Get Square by Multiplying in Java

In this example, we used the multiply operator to get the square of a double value. This is one of the easiest and fast ways to get the square of any number. See the example below.

public class SimpleTesting {
  public static void main(String[] args) {
    double dval = 25.0;
    System.out.println("double value = " + dval);
    double result = dval * dval;
    System.out.println("square result " + result);
  }
}

Output:

double value = 25.0
square result 625.0

Get Square by Math.pow() Method in Java

Java provides a built-in math method, pow(), to get the square of any value. This method takes two arguments, one is the value, and the second is the power. We pass the second argument as 2 because we want a square as a result. See the example below.

public class SimpleTesting {
  public static void main(String[] args) {
    double dval = 25.0;
    System.out.println("double value = " + dval);
    double result = Math.pow(dval, 2);
    System.out.println("square result " + result);
  }
}

Output:

double value = 25.0
square result 625.0