passref.java

这个源码是个提供大家学习的

class PassRef
{
    int x;
    public static void main(String args[])
    {
      PassRef obj = new PassRef();
      obj.x = 5;
      change(obj);
      System.out.println(obj.x); 
    }
    public static void change(PassRef obj)
    {
    	obj = new PassRef();
      obj.x = 3;
    }
}