java.lang.Double.parseDouble()

package com.codingdict;



import java.lang.*;



public class DoubleDemo {



   public static void main(String[] args) {



      Double d = new Double("6.35");



      // returns the double value represented by the string argument

      String str = "50";

      double retval = d.parseDouble(str);

      System.out.println("Value = " + retval);

   }

}