class?Point?{
????int?xy;
????void?setXY（int?mint?n）{
?????????x?=?m;
?????????y?=?n;
????}
}
public?class?Example4_4?{
???public?static?void?main（String?args[]）?{
??????Point?p1p2;????????????????
??????p1=new?Point（）;?????????
??????p2=new?Point（）;
??????System.out.println（“p1的引用:“+p1）;
??????System.out.println（“p2的引用:“+p2）;
??????p1.setXY（11112222）;
??????p2.

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件?????????798??2010-12-05?22:52??Example4_4.java