使用Swing的setter和getter时的基本逻辑问题

时间:2016-09-06 06:36:26

标签: java swing

我正在编写一个基本程序来模拟用户和计算机之间的对话。我正在尝试使用setter和getter来更改另一个类中textField中的文本。单击该按钮,textField中不显示任何内容。这是我的代码:

public class DialogueWindow extends JFrame {

    SuperDialogue SD = new SuperDialogue();
    JTextField textField = new JTextField();
    JButton Answer1 = new JButton();

    public DialogueWindow() {
        initUI();   
    }

    public void initUI() {

        JPanel panel = new JPanel();
        getContentPane().add(panel);
        panel.setLayout(null);

        JButton Answer1 = new JButton();
        Answer1.setBounds(102, 149, 113, 30);

        Answer1.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {

                textField.setText(SD.getReply1());  
            }
        });

        panel.add(Answer1);

        textField = new JTextField();
        textField.setBounds(56, 74, 174, 45);
        panel.add(textField);

        setTitle("Dialogue");
        setSize(800, 600);
        setLocationRelativeTo(null);
        setDefaultCloseOperation(EXIT_ON_CLOSE);    
    }
}

public class SuperDialogue {

    private String answer;

    public String getReply1(){
        return this.answer;         
    }

    public void setReply1(String a1){

    this.answer = a1;       
    }   
}
public class Conversation1 extends SuperDialogue {

public void Convo(){
    String firstLine = "hello";
    setReply1(firstLine);
    DialogueWindow DW = new DialogueWindow();
    DW.setVisible(true);
    DW.setSize(300,300);
    }   
}

public class Main {

public static void main(String[] args) {

    Conversation1 c1 = new Conversation1();
    c1.Convo();
    }
}

1 个答案:

答案 0 :(得分:2)

JFrame类中的SuperDialogue与您在main中创建的SuperDialogue不同。

SuperDialogue SD = new SuperDialogue();

这一行创建了一个单独的SuperDialog,它没有相同的值。这个从未设置,因此getReply1()不返回任何内容。