Java:构造函数和传递变量时出错

我试图以

dd-mm-yyyy

格式输入日期，并且必须以e格式返回。g<代码>9月29日星期二。我是Java新手，不确定我的day、month、year类的值是否返回到main。

Date-date1=new-Date（day1，month1，year1）

有一个错误，表示它未定义，并使其成为构造函数。如果我让它成为一个构造函数并运行程序，我会得到像

lab2一样的值。Day@659e0bfd

。不知道从这里到哪里去

package lab2;

public class Calendar {

//assume all months have 30 days and that 1 January is a Monday;

public static void main(String[] args) { // e.g. input: 29 09 2015

    int in1 = Integer.parseInt(args[0]);
    int in2 = Integer.parseInt(args[1]);
    int in3 = Integer.parseInt(args[2]);

    Day day1 = new Day(in1, in2); // string
    Month month1 = new Month(in2); // string
    Year year1 = new Year(in3); // integer


     Date date1 = new Date(day1, month1, year1); //

    date1.printName(); // e.g. "The date is Tuesday, 29th of September, 2015

}
}

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“Date date1=新日期（day1，month1，year1）”有错误 说它是未定义的，并使它成为构造函数

因为在

Date

类中没有像

Date（d天，m月，y年）

这样的参数化构造函数。它具有构造函数

Date（字符串temp1、字符串temp2、int temp3）

。所以参数类型是不同的

而不是

Date date1 = new Date(day1, month1, year1);

使用

“Date date1=新日期（day1，month1， 第1年）“说它是未定义的，并使其成为构造函数。如果我 它是一个构造函数并运行程序，我得到的值如下 “lab2。Day@659e0bfd". 不知道从这里到哪里去

你得到了lab2。Day@659e0bfd因为您还没有实现toString（）方法。在Day、Month和Year类中实现toString（）方法，您将获得所需的结果。请检查下面的代码-

 public class Day {
    private int day;
    private int month;
    private int code;
    private String name; //e.g. Tuesday 

    public Day(int dy, int mth ){
        day = dy;
        month = mth;
        code = ((day*month) % 7);


        // Assigning the day variable number to text //
        switch (code) {
        case 0: name = "Monday";
                break;
        case 1: name = "Tuesday";
                break;
        case 2: name = "Wednesday";
                break;
        case 3: name = "Thursday";
                break;
        case 4: name = "Friday";
                break;
        case 5: name = "Saturday";
                break;
        case 6: name = "Sunday";
                break;
        default: System.out.println("Incorrect Day Entered");}

        }
        @Override
        public String toString() {
            return name;
        }

    }

类似地，可以将toString（）方法放在Month类中

public class Month {

private int month1;
private String monthName;




public Month(int temp1){
    month1=temp1;


switch (month1) {
case 1: monthName = "January";
        break;
case 2: monthName = "February";
        break;
case 3: monthName = "March";
        break;
case 4: monthName = "April";
        break;
case 5: monthName = "May";
        break;
case 6: monthName = "June";
        break;
case 7: monthName = "July";
        break;
case 8: monthName = "August";
        break;
case 9: monthName = "September";
        break;
case 10: monthName = "October";
        break;
case 11: monthName = "November";
        break;
case 12: monthName = "December";
        break;
default: System.out.println("Incorrect Month Error");

        @Override
        public String toString() {
            return monthName;
        }

}

你的年班-

public class Year {

private int yearNumber;

public Year(int temp2)
{
    yearNumber=temp2;


}

        @Override
        public String toString() {
            return yearNumber;
        }
}

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我投票结束这个问题，因为这个问题属于主题。

Date date1 = new Date(day1, month1, year1);

Date date1 = new Date(day1.name, month1.monthName, year1.yearNumber); 

 public class Day {
    private int day;
    private int month;
    private int code;
    private String name; //e.g. Tuesday 

    public Day(int dy, int mth ){
        day = dy;
        month = mth;
        code = ((day*month) % 7);


        // Assigning the day variable number to text //
        switch (code) {
        case 0: name = "Monday";
                break;
        case 1: name = "Tuesday";
                break;
        case 2: name = "Wednesday";
                break;
        case 3: name = "Thursday";
                break;
        case 4: name = "Friday";
                break;
        case 5: name = "Saturday";
                break;
        case 6: name = "Sunday";
                break;
        default: System.out.println("Incorrect Day Entered");}

        }
        @Override
        public String toString() {
            return name;
        }

    }

public class Month {

private int month1;
private String monthName;




public Month(int temp1){
    month1=temp1;


switch (month1) {
case 1: monthName = "January";
        break;
case 2: monthName = "February";
        break;
case 3: monthName = "March";
        break;
case 4: monthName = "April";
        break;
case 5: monthName = "May";
        break;
case 6: monthName = "June";
        break;
case 7: monthName = "July";
        break;
case 8: monthName = "August";
        break;
case 9: monthName = "September";
        break;
case 10: monthName = "October";
        break;
case 11: monthName = "November";
        break;
case 12: monthName = "December";
        break;
default: System.out.println("Incorrect Month Error");

        @Override
        public String toString() {
            return monthName;
        }

}

public class Year {

private int yearNumber;

public Year(int temp2)
{
    yearNumber=temp2;


}

        @Override
        public String toString() {
            return yearNumber;
        }
}