java - 实现一个负责创建和存储对象的 "manager"类

Question

这个项目的目标是利用我已经编写的现有代码并实现一个“管理器”类，该类将负责在数组中创建和存储 Dog 对象。我的问题是，我不明白为什么需要这样做，这阻碍了我理解我需要做什么/更改我的代码。任何帮助将不胜感激。谢谢!

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

class Dog {
    private String name;
    private String breed;
    private String age;


    // Constructs fields
    public Dog(String name, String breed, String age) {
        this.name = name;
        this.breed = breed;
        this.age = age;

    }

    public String setName(String Name) {
        this.name = name;
        return name;
    }

    public String setbreed(String breed) {
        this.breed = breed;
        return breed;
    }

    public String setage(String age) {
        this.age = age;
        return age;
    }

    public String toString() {
        return ("Name: " + this.name + " breed: " + this.breed + " age: " + this.age);
    }
}


public class LabFour extends JFrame implements ActionListener {
    public LabFour() {
        setLayout(new GridLayout(5, 1, 1, 1));

        // Creates TextField, TextArea, and button components
        name = new JTextField();
        breed = new JTextField();
        age = new JTextField();
        JButton jbtSubmit = new JButton("Submit");
        echoDog = new JTextArea();

        // Add TextField, TextArea, and button components to the frame
        add(new JLabel("Name: "));
        add(name);
        add(new JLabel("breed: "));
        add(breed);
        add(new JLabel("age: "));
        add(age);
        add(new JLabel("Submit Button: "));
        add(jbtSubmit);
        jbtSubmit.addActionListener(this);
        add(new JLabel("Submitted Text: "));
        add(echoDog);
        echoDog.setEditable(false);

    }

    // TextFields
    private JTextField name;
    private JTextField breed;
    private JTextField age;

    // Echo TextArea
    private JTextArea echoDog;

    // Listener
    public void actionPerformed(ActionEvent a) {

        Dog[] Dogs = new Dog[50];
        int arrayLocation = 0;

        Dog Dog1 = new Dog(name.getText(), breed.getText(),
                age.getText());
        // Checks remaining array space
        if (arrayLocation < 50) {
            Dogs[arrayLocation] = Dog1;
            ++arrayLocation;
        }
        // Echos back entered text while storing the previous text
        echoDog.setText(echoDog.getText() + "\n" + Dog1.toString());
    }

    // Main
    public static void main(String[] args) {
        LabFour frame = new LabFour();
        frame.setTitle("Dog Interface");
        frame.setSize(1200, 900);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
        frame.setVisible(true);

    }

}

Answer 1

正如您所写的“Manager 将负责在数组中创建和存储 Dog 对象”，因此您需要创建更好的 Dog 对象列表(以便您可以添加和删除 Dogs)，为此列表添加 CRUD 方法。如果您需要列表中的数组，稍后可以轻松转换它。

所以放这样的东西

public class Manager {

   private List<Dog> = new ArrayList<>();

   ...

   CRUD operations here

}

然后您需要添加 UI 控件来实际输入有关狗的信息，并显示狗的表格。所以它将是 Pane 、文本输入、按钮等。