方法重载

[java]代码库

public class BirthdayTest
{
	int year,month,day;//成员变量
    Birthday gt;

	public BirthdayTest(int year){//方法重载
	  this.year=year;//用this关键字来初始化
	}

	public BirthdayTest(int year,int month){//方法重载
	  this(year);//用this关键字作为参数来传值
	  this.month=month;
	}

   public BirthdayTest(int year,int month,int day){//方法重载
	  this(year,month);//用this关键字作为参数来传值
	  this.day=day;
	}

	
	public static void main(String[] args){
	
	  BirthdayTest birthday=new BirthdayTest(2017,7,18);
	       System.out.println("出生年月日"+birthday.year+"年"+birthday.month+"月"+birthday.day+"日");
	}
};