兩人對象

Question

import cs1.Keyboard; 
import java.util.Scanner; 
class Person 
{ 
    private String name; 
    private String persnr; 
    private String adress; 
    private int age; 

    public Person(String _name, String _persnr, String _adress, int _age) 
    { 
     name = name; 
     persnr = persnr; 
     adress = adress; 
     age = age; 
    } 

    public void byterNamn(String _name) 
    { 
     name = _name; 
    } 

    public void byterAdress(String _adress) 
    { 
     adress = _adress; 
    } 

    public void fyllerAr() 
    { 
     age = age + 1; 
    } 

    public String hamtaNamn() 
    { 
     return name; 
    } 

    public String hamtaPersonnmmer() 
    { 
     return persnr; 
    } 

    public String hamtaAdress() 
    { 
     return adress; 
    } 

    public int hamtaAlder() 
    { 
     return age; 
    } 

    public String toString() 
    { 
    String _toString; 
    _toString = "Namn: " + name + "\nÅlder: " + age; 
    _toString = _toString + "\nPersonnummer: " + persnr + "\nAdress: " + adress; 
    return _toString; 
    } 

    public p1() 
    { 
     System.out.print("namn: "); 
     name = Keyboard.readString();  

     System.out.print("adress: "); 
     String adress = Keyboard.readString(); 

     System.out.print("ålder: "); 
     Integer age = new Integer(); 
     age.parseInt(Keyboard.readint()); 

     System.out.print("personnummer: "); 
     String persnr = Keyboard.readString(); 

    } 
    public p2() 
    { 
     System.out.print("namn: "); 
     name = Keyboard.readString();  

     System.out.print("adress: "); 
     String adress = Keyboard.readString(); 

     System.out.print("ålder: "); 
     Integer age = new Integer(); 
     age.parseInt(Keyboard.readint()); 

     System.out.print("personnummer: "); 
     String persnr = Keyboard.readString(); 
    } 

    public static void main(String[] args) 
    { 
     String name = Keyboard.readString(); 
     String persnr = Keyboard.readString(); 
     String adress = Keyboard.readString(); 
     int age = Keyboard.readint(); 
     Person p1 = new Person(name, age, adress, personnummer); 

     String name = Keyboard.readString(); 
     String persnr = Keyboard.readString(); 
     String adress = Keyboard.readString(); 
     int age = Keyboard.readint(); 
     Person p2 = new Person(name, age, adress, personnummer); 

    } 
} 

你好。 我試圖這樣做，它是2人。你應該輸入兩個人的年齡，姓名，地址，然後在程序運行時輸入你想要的內容後打印出來。我想知道我如何在公共P1（）和公共P2（）上做回報，所以我可以做到這一點。或者它是一個更簡單的方法來做到這一點？

Answer 1

此代碼不能編譯。 public p1()和public p2()不是有效的方法聲明。在public後和方法名之前，您必須至少添加一個方法的返回類型，例如：

public Person p1() 

那我猜你想要做的就是從每個這兩種方法的返回Person對象。裏面的方法，你必須創建一個新Person對象，然後從方法返回它：

return new Person(name, persnr, adress, age); 

請參閱Oracle的Java教程Defining Methods和Returning a Value from a Method。