在构造函数上声明日期

问题描述

刚开始学习Java并完成练习。

我有以下代码：

package exercise1;

import java.text.SimpleDateFormat;
import java.util.Date;

public class Singer {

//Class Parameters
int id;
String name;
String address;
Date dob;
int nAlbums;

//Overloaded Constructors
public Singer()
{
    
}

public Singer(int id)
{
this.id = id;
}

public Singer(int id,String name)
{
this.id = id;
this.name = name;
}

public Singer(int id,String name,String address)
{
this.id = id;
this.name = name;
this.address = address;
}

public Singer(int id,String address,Date dob)
{
this.id = id;
this.name = name;
this.address = address;
this.dob = dob;
}

public Singer(int id,Date dob,int nAlbums)
{
this.id = id;
this.name = name;
this.address = address;
this.dob = dob;
this.nAlbums = nAlbums;
}

//All Setters
public void setId (int id)
{

    this.id = id;
    
}

public void setName (String name)
{

    this.name = name;
    
}

public void setAddress (String address)
{

    this.address = address;
    
}

public void setDOB (Date dob)
{

    this.dob = dob;
    
}

public void setNAlbums (int nAlbums)
{

    this.nAlbums = nAlbums;
    
}

public void setSinger (int id,int nAlbums)
{
    this.id = id;
    this.name = name;
    this.address = address;
    this.dob = dob;
    this.nAlbums = nAlbums;
    
}

//All Getters

public int ID ()
{
    return id;
}

public String Name ()
{
    return name;
}

public String Address ()
{
    return address;
}

public Date DOB ()
{
    return dob;
}

public int NAlbums ()
{
    return nAlbums;
}

public String Display()
{
    return "\nID: " + id + "\nName: " + name + "\nAddress: " + address + "\nBirthday: " +dob+ "\nNumber of Albums: "+nAlbums;
}
public static void main(String[] args) {
    
    String pattern = "yyyy-MM-dd";
    SimpleDateFormat sdf = new SimpleDateFormat(pattern);
    
    Singer singer1 = new Singer();

    System.out.println("\nID (singer1): "+ singer1.id);

    System.out.println("\nName (singer1) :"+ singer1.name);

    System.out.println("\nAddress (singer1) :"+ singer1.address);
    
    System.out.println("\nBirthday (singer1) :"+ singer1.dob);
    
    System.out.println("\nNumber of Albums (singer1) :"+ singer1.nAlbums);

        singer1.setSinger(1,"Davy Jones","12 Main Street",sdf.parse("1947-01-08"),27);
            
    System.out.println("\nsinger1 Details: "+ singer1.Display());

        
}

}

因此发生了两个错误：

1. 要我扔一个假面;
2. 即使我接受更正，我也会通过以下格式接收日期：

singer1 Details: 
ID: 1
Name: Davy Jones
Address: 12 Main Street
Birthday: Wed Jan 08 00:01:00 EST 1947
Number of Albums: 27

使用Eclipse

谢谢您的帮助！

编辑

感谢您的帮助，这是最终代码：

package exercise1;

import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.Locale;

public class Singer {

//Class Parameters
int id;
String name;
String address;
LocalDate dob;
int nAlbums;

//Overloaded Constructors
public Singer()
{
    
}

public Singer(int id)
{
this.id = id;
}

public Singer(int id,LocalDate dob)
{
this.id = id;
this.name = name;
this.address = address;
this.dob = dob;
}

public Singer(int id,LocalDate dob,int nAlbums)
{
this.id = id;
this.name = name;
this.address = address;
this.dob = dob;
this.nAlbums = nAlbums;
}

//All Setters
public void setId (int id)
{

    this.id = id;
    
}

public void setName (String name)
{

    this.name = name;
    
}

public void setAddress (String address)
{

    this.address = address;
    
}

public void setDOB (LocalDate dob)
{

    this.dob = dob;
    
}

public void setNAlbums (int nAlbums)
{

    this.nAlbums = nAlbums;
    
}

public void setSinger (int id,int nAlbums)
{
    this.id = id;
    this.name = name;
    this.address = address;
    this.dob = dob;
    this.nAlbums = nAlbums;
    
}

//All Getters

public int ID ()
{
    return id;
}

public String Name ()
{
    return name;
}

public String Address ()
{
    return address;
}

public LocalDate DOB ()
{
    return dob;
}

public int NAlbums ()
{
    return nAlbums;
}

public String Display()
{
    return "\nID: " + id + "\nName: " + name + "\nAddress: " + address + "\nBirthday: " +dob+ "\nNumber of Albums: "+nAlbums;
}
public static void main(String[] args) {
    
    Singer singer1 = new Singer();
    
    System.out.println("\nID (singer1): "+ singer1.id);

    System.out.println("\nName (singer1) :"+ singer1.name);

    System.out.println("\nAddress (singer1) :"+ singer1.address);
    
    System.out.println("\nBirthday (singer1) :"+ singer1.dob);
    
    System.out.println("\nNumber of Albums (singer1) :"+ singer1.nAlbums);

    singer1.id = 1;
    
    singer1.name = "Davy Jones";
    
    singer1.address = "12 Main Street";
    
    String string = "January 08,1947";
    
    DateTimeFormatter pattern = DateTimeFormatter.ofPattern("MMMM dd,yyyy",Locale.ENGLISH);
    
    LocalDate date = LocalDate.parse(string,pattern);
    
    singer1.dob = date;
    
    singer1.nAlbums = 27;
    
    System.out.println("\nAll singer properties set\n");
    
    System.out.println("\nsinger1 Details: "+ singer1.Display());
    

}

}

解决方法

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