Question

我的程序中有一个AddressBook类和一个Persons类。 AddressBook类有一个Persons对象数组。

import java.util.*;
public class Persons {
    private String name;
    private String lastName;
    private String addres;
    private String city;
    private String state;
    private int zip;
    private String phoneNumber;

    public Persons(String name , String lastname,String phoneNumber) {
        this.name = name;
        this.lastName = lastname;
        this.phoneNumber = phoneNumber;
    }

//some getter and setter here for all private fields and some other code

这是AddressBook.addPerson方法：

public void addPerson(Persons prs) {
    for (int i = 0; i < ArrayOfPerson.length; i++) {
        if (ArrayOfPerson[i] == null) {
            ArrayOfPerson[i] = prs;
            break;
        }
    }
}

和Main类：

public class Main {        
    public static void main(String[] args) {
        AddressBook addr = new AddressBook();
        addr.addPerson(new Persons("first name", "first lastname", "123"));// in here for example/ how can i use this person object later
        addr.addPerson(new Persons("second name", "second lastname", "456"));
        addr.addPerson(new Persons("third name", "thirs last name", "789"));
        addr.addPerson(new Persons("fourth name", "fourth last name", "101112"));
    }
}

我的问题是关于Main课程。如何重新使用创建的人物对象？例如，我想做这样的事情：

System.out.println(x.getname());

其中x是由new关键字作为参数创建的person对象。

打扰一下，如果我的问题是初学者的问题......我在google搜索并没有找到任何内容。

Answer 1

您只需要在创建变量时将此对象分配给变量，然后您可以访问它并将其作为参数传递：

Persons firstOne = new Persons("first name","first lastname","123");

您的代码将是：

public static void main(String[] args) {
    AddressBook addr = new AddressBook();
    Persons firstOne = new Persons("first name","first lastname","123");

    //You will use it as parameter like this:
    addr.addPerson(firstOne);
    addr.addPerson(new Persons("second name", "second lastname","456"));
    addr.addPerson(new Persons("third name", "thirs last name","789"));
    addr.addPerson(new Persons("fourth name", "fourth last name","101112"));
}

然后你可以像这样访问它：

System.out.println(firstOne.getname());

或者，如果没有创建变量，您可以通过其索引addr.get(index)从集合中获取它：

System.out.println(addr.get(0).getname());

Answer 2

您应该将每个Persons存储到一个变量中，如下所示：

Persons p1 = new Persons("first name","first lastname","123")

然后获取字段name：

System.out.println(p1.getName());

Answer 3

你必须向这个人提供变量：

addr.addPerson(x);
System.out.println(x.getname());

然后你可以这样做：

System.out.println(addr.get(3).getname())

或者您可以从lits中获取元素：

@media all and (max-width: 1200px) and (-ms-high-contrast:active), (-ms-high-contrast:none) {
    .breadcrumb.Connect {
        bottom: 176%;
    }
}
@media all and (min-width: 1920px) and (-ms-high-contrast:active), (-ms-high-contrast:none) {
    .breadcrumb.Connect {
        bottom: 181.5%;
        left: -30%;
        width: 160.2%;
    }
}
@media all and (min-width: 1201px) and (max-width: 1919px) and (-ms-high-contrast:active), (-ms-high-contrast:none) {
    .breadcrumb.Connect {
        bottom: 172.5%;
        left: -7.5%;
        width:115.2%;
    }
    div.newsletter-container-connect div.right-form-block {
        width: 43%;
    }
}

Answer 4

你会做这样的事情：

  public class Main {

public static void main(String[] args) {
    AddressBook addr = new AddressBook();
    addr.addPerson(new Persons("first name","first lastname","123"));// in here for example/ how can i use this person object later
    addr.addPerson(new Persons("second name", "second lastname","456"));
    Person x = new Persons("third name", "thirs last name","789")
    addr.addPerson(x);
    addr.addPerson(new Persons("fourth name", "fourth last name","101112"));
    System.out.println(x.getName());
}

如何使用在java中作为参数创建的对象

4 个答案: