将动作侦听器添加到在Java循环中创建并从另一个类调用的新jbutton中 [英] adding action listeners to a new jbutton created in a loop in java and called from another class

问题描述

我试图在循环中创建的JButton中添加ActionListener，然后从另一个类(控制器类)调用ActionListener，但是它不起作用.我不知道为什么.

I am trying to add an ActionListener to a JButton created in a loop, then call the ActionListener from another class (the controller class), but its not working. I don't know why.

这是头等舱

public class Browse extends JPanel {

    private JButton play_lists_btn;

    public Browse() {

        int increment = 0;
        while (increment < 5) {
            add(createButton(increment));
            increment++;
        }
    }

    private JButton createButton(final int i) {

        play_lists_btn = new JButton();
        play_lists_btn.setText(" This is " + i);
        return play_lists_btn;
    }

    public void addPlayListener(ActionListener play) {
        play_lists_btn.addActionListener(play);
    }

    public static void main(String args[]) {
        Browse b = new Browse();
        BrowseController bc = new BrowseController(b);
        JFrame frame = new JFrame();
        frame.add(b);
        frame.setSize(1100, 830);
        frame.setLocationRelativeTo(null);
        frame.setResizable(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
}

这是调用按钮ActionListener并为按钮创建ActionEvent的控制器类

Here is the controller class that calls the button ActionListener, and creates an ActionEvent for the button

public class BrowseController {

    private Browse b;

    public BrowseController(Browse b) {
        this.b = b;
        b.addPlayListener(new PlayListener());
    }

    private class PlayListener implements ActionListener {

        @Override
        public void actionPerformed(ActionEvent e) {
            String text = (String) e.getActionCommand();
            System.out.println(text);
        }
    }   
}

似乎没有任何作用.打印语句永远不会出现.请帮忙，因为我正在尝试实现MVC设计模式.

Nothing seems to work. the print statement never show up. please help, because I am trying to achieve the MVC design pattern.

推荐答案

尝试一下，

将内部类移动到Browse.java中，并为每个创建的每个按钮添加ActionListener

Move your inner class inside Browse.java and add ActionListener for each and every button created

import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;


public class Browse extends JPanel {

    private JButton [] play_lists_btn=new JButton[5];//define an array of JButtons

public Browse() {

    int increment = 0;
    while (increment < 5) {
        add(createButton(increment));
        increment++;
    }
}

private JButton createButton(final int i) {

    play_lists_btn[i] = new JButton();
    play_lists_btn[i].setText(" This is " + i);
    return play_lists_btn[i];
}

public void addPlayListener(ActionListener play) {
    for(JButton b : play_lists_btn)
    b.addActionListener(play);
}



public static void main(String args[]) {
    client.Browse b = new client.Browse();
    BrowseController bc = new BrowseController(b);
    JFrame frame = new JFrame();
    frame.add(b);
    frame.setSize(1100, 830);
    frame.setLocationRelativeTo(null);
    frame.setResizable(true);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);
}
}

BrowseController.java

BrowseController.java

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;


public class BrowseController {

private Browse b;

public BrowseController(Browse b) {
    this.b = b;
    b.addPlayListener(new PlayListener());
}

    private class PlayListener implements ActionListener {

        @Override
        public void actionPerformed(ActionEvent e) {
            String text = (String) e.getActionCommand();
            System.out.println(text);
        }
    }

}

这篇关于将动作侦听器添加到在Java循环中创建并从另一个类调用的新jbutton中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！