请帮忙改一个程序

[cbcool]

我想写一个对象如下，但是出错（刚开始学，请多多指教）请问怎么改？谢谢！
public class ShowDate{
private int day,month,year;
public void SetDate(int d,m,y){
day := d;
month := m;
year := y;
}
public void PrintDate {
System.out.println("The Date is :"+ year + "年" + month + "月" + day + "日");
}
}