java - 将扫描仪传递给方法

Question

谁能告诉我为什么日期打印0/0/0？
缺少哪部分代码，因此使用 Scanner 输入的值被传递到方法 DisplayDate 并打印在屏幕上？

import java.util.Scanner;

public class DateClass {

public static void main(String[] args) {

    Scanner scanner = new Scanner(System.in);
    System.out.println("Enter day:");
    int day = scanner.nextInt();
    System.out.println("Enter month:");
    int month = scanner.nextInt();
    System.out.println("Enter year:");
    int year = scanner.nextInt();

    Date d = new Date(day,month,year);
    d.DisplayDate();

}

}

class Date {

private int day;
private int month;
private int year;


public Date(int day, int month, int year) {
}

public int getDay() {
    return day;
}

public void setDay(int day) {
    this.day = day;
}

public int getMonth() {
    return month;
}

public void setMonth(int month) {
    this.month = month;
}

public int getYear() {
    return year;
}

public void setYear(int year) {
    this.year = year;
}


public void DisplayDate() {
    System.out.println(getDay() + "/" + getMonth() + "/" + getYear());
}

}  

Answer 1

你没有保存你的日、月、年。您应该在构造函数中执行此操作:

public Date(int day, int month, int year) {
    this.day = day;
    this.month = month;
    this.year = year;
}