how to use pow function in java

import java.lang.Math; 
  
class Gfg { 
  
    // driver code 
    public static void main(String args[]) 
    { 
        double a = 30; 
        double b = 2; 
        System.out.println(Math.pow(a, b)); 
  
        a = 3; 
        b = 4; 
        System.out.println(Math.pow(a, b)); 
  
        a = 2; 
        b = 6; 
        System.out.println(Math.pow(a, b)); 
    }