How to calculate square root in java code example

Example 1: math sqrt java

import java.lang.Math;

double x = Math.sqrt(9);

Example 2: how to give square in java

import java.util.*;
public class Square {
    public static void main(String args[]){
        Scanner sc=new Scanner(System.in);
        int num;
     
        System.out.print("Enter an integer number: ");
        num=sc.nextInt();
     
        System.out.println("Square of "+ num + " is: "+ Math.pow(num, 2));
        
    }
}

Example 3: square root of a number in java without sqrt

Scanner in=new Scanner(System.in);
int num=in.nextInt();
Systen.out.println(Math.pow(num,0.5));