定义一个Date类,成员变量year,month和day，成员方法包括input_Date()和out_putDate(),分别用于实现日期的

public class Date{
    private int year,month,day;
    public Date(){  
    }
    public void input_Date(int year,int month,int day){
        this.year = year;
        this.month = month;
        this.day = day;
    }
    public void output_Date(){
        System.out.println("日期是："+year+"年"+month+"月"+day+"日");
    }
}
//测试类
public class Test{
    public static void main(String args[]){
        Date date = new Date();
        Scanner input = new Scanner(System.in);
        System.out.println("请输入年月日：");
        int year = input.nextInt();
        int month = input.nextInt();
        int day = input.nextInt();
        date.input_Date(year,month,day);
        date.output_Date();
    }
}

分别实现日期的什么？