# How to Square a number In java

We will learn in this tutorial how to square a number in java . We can square in java using multiple methods . First we see what is squaring in java , then we will see example of square in java .

## What is the square of a number?

In mathematics or algebra, you can calculate the “square” of a number, by multiplying the same number with itself.

Example : the square of 2 is (2*2=4)4, and the square of 3 is (3*3=9)9.

## How to Square a number In java ?

Now we can square in java using these below methods .

1. Square a number by multiplying it by itself
2. Square a number using Math.pow function

## 1.  Square a number by multiplying it by itself

We can find square in java multiply number by itself .  It is very simple method for squaring in java for any  number .

``````public class SquareNumber {

public static void main(String[] args) {
int num = 2;
int square = num * num ;
System.out.println("square of num :"+ num +" is :"+ square );
}
}``````

Output :

``square of num :2 is :4``

## Square a number using Math.pow function

We can use Java math.pow() method for squaring in java . In this example of square  Math.pow(num, POW) multiply num with itself  POW times .

``````public class SquareNumber2 {

public static final Integer POW = 2;

//return square a number
public static Double getSquare(Double num) {
//square a number
return Math.pow(num, POW);
}

public static void main(String[] args) {
double num = 2;
System.out.println("square of num :"+ num +" is :"+ getSquare(num) );
num = 3;
System.out.println("square of num :"+ num +" is :"+ getSquare(num) );
}
}``````

Output :

``````square of num :2.0 is :4.0
square of num :3.0 is :9.0``````

In this tutorial we learned how to square a number in java using multiple methods. squaring in java is frequently ask question in academic exam . So you should try these example of square . You can find more java program for practice .