将变量从类添加到 ArrayList

Question

我们应该创建 2 个 .java 文件。然后，我尝试将 FakeUser.java 中的构造函数中的所有详细信息添加到 ReviewSpammer.java 中名为 users 的 ArrayList 中，但是似乎无法理解如何做到这一点？

FakeUser.java：

public class FakeUser {
private String name;
private int age;
private String location;

public FakeUser(String name, int age, String location){
    this.name = name ;
    this.age = age;
    this.location = location;
}

public String toString(){
    return name + ", " + age + ", " + location;
}
}

ReviewSpammer.java：

public class ReviewSpammer {
    private ArrayList<String> phrases;
    private ArrayList<String> stories;
    private ArrayList<Class> users;

    public ReviewSpammer(){

    }

    public void addPhrase(String newPhrase){
        phrases = new ArrayList<>();
        phrases.add(newPhrase);
    }

    public void addStory(String newStory){
        stories = new ArrayList<>();
        stories.add(newStory);

    }

    public void addUser(Class FakeUser){
        this.users = new ArrayList<>();
    }
}

Answer 1

我不确定我是否理解您的问题，但如果您想使用您应用中的所有用户，您将需要一个容器来组织所有用户。

如果会看一些链接这个（只是伪代码）：

   public class UserContainer {

     private List<User> allUsers;

     //Singelton Constructor for the container

     public addUser(User user) {
     allUsers.add(user)
     }

   }

   //update your FakeUser constructor

   public FakeUser(String name, int age, String location){
     this.name = name ;
     this.age = age;
     this.location = location;
     UserContainer.getInstance().addUser(this);
   }

您还应该注意删除用户。

希望这会有所帮助；）

Answer 2

如果我理解正确，您想在用户列表中添加一个或多个 FakeUser？

public class ReviewSpammer {
    private ArrayList<String> phrases;
    private ArrayList<String> stories;
    private ArrayList<FakeUser> users;

    public ReviewSpammer() {
        phrases = new ArrayList<>();
        stories = new ArrayList<>();
        users = new ArrayList<>();
    }

    public void addPhrase(String newPhrase){
        phrases.add(newPhrase);
    }

    public void addStory(String newStory){
        stories.add(newStory);
    }

    public void addUser(FakeUser newUser){
        users.add(newUser);
    }
}   

然后像这样使用它：

ReviewSpammer reviewSpammer = new ReviewSpammer();

FakeUser johnDoe = new FakeUser("John Doe", 22, "New York");
reviewSpammer.addUser(johnDoe);

Answer 3

import java.util.*;
import java.lang.*;
import java.io.*;

class FakeUser {

private String name;
private int age;
private String location;

public FakeUser(String name, int age, String location){
    this.name = name ;
    this.age = age;
    this.location = location;
}

public String toString(){
    return name + ", " + age + ", " + location;
}

    public static void main(String[] args)
    {
        FakeUser user=new FakeUser("anupam",20,"delhi");
        FakeUser user2=new FakeUser("lucky",20,"delhi");
        ReviewSpammer rs=new ReviewSpammer();
        rs.addPhrase("phrase");
        rs.addStory("story");
        rs.addUser(user);
        rs.addUser(user2);

        ArrayList<FakeUser> list=rs.users;

        for(int i=0;i<list.size();i++)
        {
            FakeUser fake=list.get(i);
            System.out.println(fake.name+" "+fake.age+" "+fake.location);
        }


    }

}


 class ReviewSpammer {
    private ArrayList<String> phrases;
    private ArrayList<String> stories;
    public ArrayList<FakeUser> users;

    public ReviewSpammer(){             /*Make the arraylist in constructor, not in the methods below as you did */
        phrases = new ArrayList<>();
        stories = new ArrayList<>();
        users = new ArrayList<>();

    }

    public void addPhrase(String newPhrase){
        phrases.add(newPhrase);
    }

    public void addStory(String newStory){
        stories.add(newStory);

    }

    public void addUser(FakeUser user){ /* Make the array list of **FakeUser** class not of **Class** and pass the object of FakeUser as parameter*/
        users.add(user);
    }
}

这是您想要的工作演示。如果理解代码有问题，请告诉我。我已经解释了你在 cmets 中的错误。