1 package java.lang;

     2 

     3 public class Double extends Number

     4 {

     5     public static Double valueOf(double v) {

     6         return new Double(v);

     7     }

     8 

     9     public Double(double v) {

    10         value = v;

    11     }

    12 

    13     public double doubleValue() {

    14         return value;

    15     }

    16 

    17     private double value;

    18 }