java.lang.Long.getLong(String nm)

package com.codingdict;



import java.lang.*;



public class LongDemo {



   public static void main(String[] args) {



      // determines the Long value of the system property 

      String str = "sun.arch.data.model";

      System.out.println(Long.getLong(str));



      // prints null

      str = "lang";

      System.out.println(Long.getLong(str));

   }

}