util.Date.setMonth() should wrap around end of year

java.util.Date.setMonth() should wrap around end of year.

Steps to reproduce:
Compile and run the following code

// tests setMonth()

import java.util.Date;

class setMonthTest
{
    public static void main(String args[])
    {
       Date d1 = new Date(95, 10, 21);
       System.out.println("Date " + d1);
       d1.setMonth(11);
       System.out.println("Date changed to Thu Dec 21 1995: " + d1);

       d1.setMonth(12);
       System.out.println("Date wrapped to Sun Jan 21 1996: " + d1);
    }
}