Java 位于5个不同JPanel中的JButton数组中的操作侦听器

我有一个任务，将字母表的字母按照我在下面编码的布局放在5个面板中。当您选择一个按钮时，它会更改标签以读取所单击的按钮。 第一种方法是，我把每一个按钮分别添加到每个面板中，并添加所有的

ActionListeners

和文本。这是大约200行，但运作良好。我认为将

JButtons

放入数组并在此时添加侦听器和文本会更简洁。我能够将

JFrame

放到布局中，但我不知道如何使用

ActionListener

。我是否必须添加一个

MouseListener

，以确定单击了哪个面板，然后确定按钮被按下

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;

public class JFileCabinet1 extends JFrame implements ActionListener {
    String[] lettersPanel1 = { "A", "B", "C", "D", "E", "F" };
    String[] lettersPanel2 = { "G", "H", "I", "J", "K", "L" };
    String[] lettersPanel3 = { "M", "N", "O", "P", "Q", "R" };
    String[] lettersPanel4 = { "S", "T", "U", "V", "W", "X" };
    String[] lettersPanel5 = { "Y", "Z" };

    private JPanel jp1 = new JPanel(new GridLayout(1, 6));
    private JPanel jp2 = new JPanel(new GridLayout(1, 6));
    private JPanel jp3 = new JPanel(new GridLayout(1, 6));
    private JPanel jp4 = new JPanel(new GridLayout(1, 6));
    private JPanel jp5 = new JPanel(new GridLayout(1, 6));

    private JButton jblank1 = new JButton();
    private JButton jblank2 = new JButton();
    private JButton jblank3 = new JButton();
    private JLabel jl = new JLabel("");

    private Container con = getContentPane();
    private GridLayout layout = new GridLayout(5, 1, 5, 5);

    public JFileCabinet1() {

        super("File cabinet");

        con.add(jp1);
        for (int i = 0; i < lettersPanel1.length; i++) {
            JButton button[] = new JButton[lettersPanel1.length];
            button[i] = new JButton(lettersPanel1[i]);
            jp1.add(button[i]);
            button[i].addActionListener(this);
        }

        con.add(jp2);
        for (int i = 0; i < lettersPanel2.length; i++) {
            JButton button[] = new JButton[lettersPanel2.length];
            button[i] = new JButton(lettersPanel2[i]);
            jp2.add(button[i]);
            button[i].addActionListener(this);
        }

        con.add(jp3);
        for (int i = 0; i < lettersPanel2.length; i++) {
            JButton button[] = new JButton[lettersPanel3.length];
            button[i] = new JButton(lettersPanel3[i]);
            jp3.add(button[i]);
            button[i].addActionListener(this);
        }
        con.add(jp4);
        for (int i = 0; i < lettersPanel4.length; i++) {
            JButton button[] = new JButton[lettersPanel4.length];
            button[i] = new JButton(lettersPanel4[i]);
            jp4.add(button[i]);
            button[i].addActionListener(this);
        }

        con.add(jp5);
        for (int i = 0; i < lettersPanel5.length; i++) {
            JButton button[] = new JButton[lettersPanel5.length];
            button[i] = new JButton(lettersPanel2[i]);
            jp5.add(button[i]);
            button[i].addActionListener(this);
        }

        jp5.add(jblank1).setVisible(false);
        jp5.add(jblank2).setVisible(false);
        jp5.add(jblank3).setVisible(false);

        setSize(500, 500);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
        setLayout(layout);
    }

    public void actionPerformed(ActionEvent e) {
        JButton src = (JButton) e.getSource();

    }

    public static void main(String[] args) {
        JFileCabinet1 frame = new JFileCabinet1();
        frame.setVisible(true);

    }
}

导入java.awt.BorderLayout；
导入java.awt.Component；
导入java.awt.Container；
导入java.awt.GridLayout；
导入java.awt.event.ActionEvent；
导入java.awt.event.ActionListener；
导入javax.swing.*；
公共类JFileCabinet1扩展了JFrame实现ActionListener{
字符串[]lettersPanel1={“A”、“B”、“C”、“D”、“E”、“F”}；
字符串[]lettersPanel2={“G”、“H”、“I”、“J”、“K”、“L”}；
字符串[]lettersPanel3={“M”、“N”、“O”、“P”、“Q”、“R”}；
字符串[]lettersPanel4={“S”、“T”、“U”、“V”、“W”、“X”}；
字符串[]lettersPanel5={“Y”，“Z”}；
private JPanel jp1=新JPanel（新网格布局（1,6））；
private JPanel jp2=新JPanel（新网格布局（1,6））；
private JPanel jp3=新JPanel（新网格布局（1,6））；
private JPanel jp4=新JPanel（新网格布局（1,6））；
私有JPanel jp5=新JPanel（新网格布局（1,6））；
私有JButton jblank1=新JButton（）；
私有JButton jblank2=新JButton（）；
私有JButton jblank3=新JButton（）；
私有JLabel jl=新JLabel（“”）；
私有容器con=getContentPane（）；
私有网格布局=新网格布局（5,1,5,5）；
公共JFileCabinet1（）{
超级（“文件柜”）；
补充条款（jp1）；
对于（int i=0；i

我是否必须添加鼠标侦听器才能找到单击的面板 然后确定按钮被按下了

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;

public class JFileCabinet1 extends JFrame implements ActionListener {
    String[] lettersPanel1 = { "A", "B", "C", "D", "E", "F" };
    String[] lettersPanel2 = { "G", "H", "I", "J", "K", "L" };
    String[] lettersPanel3 = { "M", "N", "O", "P", "Q", "R" };
    String[] lettersPanel4 = { "S", "T", "U", "V", "W", "X" };
    String[] lettersPanel5 = { "Y", "Z" };

    private JPanel jp1 = new JPanel(new GridLayout(1, 6));
    private JPanel jp2 = new JPanel(new GridLayout(1, 6));
    private JPanel jp3 = new JPanel(new GridLayout(1, 6));
    private JPanel jp4 = new JPanel(new GridLayout(1, 6));
    private JPanel jp5 = new JPanel(new GridLayout(1, 6));

    private JButton jblank1 = new JButton();
    private JButton jblank2 = new JButton();
    private JButton jblank3 = new JButton();
    private JLabel jl = new JLabel("");

    private Container con = getContentPane();
    private GridLayout layout = new GridLayout(5, 1, 5, 5);

    public JFileCabinet1() {

        super("File cabinet");

        con.add(jp1);
        for (int i = 0; i < lettersPanel1.length; i++) {
            JButton button[] = new JButton[lettersPanel1.length];
            button[i] = new JButton(lettersPanel1[i]);
            jp1.add(button[i]);
            button[i].addActionListener(this);
        }

        con.add(jp2);
        for (int i = 0; i < lettersPanel2.length; i++) {
            JButton button[] = new JButton[lettersPanel2.length];
            button[i] = new JButton(lettersPanel2[i]);
            jp2.add(button[i]);
            button[i].addActionListener(this);
        }

        con.add(jp3);
        for (int i = 0; i < lettersPanel2.length; i++) {
            JButton button[] = new JButton[lettersPanel3.length];
            button[i] = new JButton(lettersPanel3[i]);
            jp3.add(button[i]);
            button[i].addActionListener(this);
        }
        con.add(jp4);
        for (int i = 0; i < lettersPanel4.length; i++) {
            JButton button[] = new JButton[lettersPanel4.length];
            button[i] = new JButton(lettersPanel4[i]);
            jp4.add(button[i]);
            button[i].addActionListener(this);
        }

        con.add(jp5);
        for (int i = 0; i < lettersPanel5.length; i++) {
            JButton button[] = new JButton[lettersPanel5.length];
            button[i] = new JButton(lettersPanel2[i]);
            jp5.add(button[i]);
            button[i].addActionListener(this);
        }

        jp5.add(jblank1).setVisible(false);
        jp5.add(jblank2).setVisible(false);
        jp5.add(jblank3).setVisible(false);

        setSize(500, 500);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
        setLayout(layout);
    }

    public void actionPerformed(ActionEvent e) {
        JButton src = (JButton) e.getSource();

    }

    public static void main(String[] args) {
        JFileCabinet1 frame = new JFileCabinet1();
        frame.setVisible(true);

    }
}

不，不要在按钮上使用鼠标侦听器。您的

ActionListener

实现很好，

getSource

将为您提供按下的按钮

要将标签设置为按钮的文本，请使用

jl.setText（src.getText（））

inside

actionPerformed

如果需要按钮所在的面板，请使用按钮的

getParent（）

我是否必须添加鼠标侦听器才能找到单击的面板 然后确定按钮被按下了

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;

public class JFileCabinet1 extends JFrame implements ActionListener {
    String[] lettersPanel1 = { "A", "B", "C", "D", "E", "F" };
    String[] lettersPanel2 = { "G", "H", "I", "J", "K", "L" };
    String[] lettersPanel3 = { "M", "N", "O", "P", "Q", "R" };
    String[] lettersPanel4 = { "S", "T", "U", "V", "W", "X" };
    String[] lettersPanel5 = { "Y", "Z" };

    private JPanel jp1 = new JPanel(new GridLayout(1, 6));
    private JPanel jp2 = new JPanel(new GridLayout(1, 6));
    private JPanel jp3 = new JPanel(new GridLayout(1, 6));
    private JPanel jp4 = new JPanel(new GridLayout(1, 6));
    private JPanel jp5 = new JPanel(new GridLayout(1, 6));

    private JButton jblank1 = new JButton();
    private JButton jblank2 = new JButton();
    private JButton jblank3 = new JButton();
    private JLabel jl = new JLabel("");

    private Container con = getContentPane();
    private GridLayout layout = new GridLayout(5, 1, 5, 5);

    public JFileCabinet1() {

        super("File cabinet");

        con.add(jp1);
        for (int i = 0; i < lettersPanel1.length; i++) {
            JButton button[] = new JButton[lettersPanel1.length];
            button[i] = new JButton(lettersPanel1[i]);
            jp1.add(button[i]);
            button[i].addActionListener(this);
        }

        con.add(jp2);
        for (int i = 0; i < lettersPanel2.length; i++) {
            JButton button[] = new JButton[lettersPanel2.length];
            button[i] = new JButton(lettersPanel2[i]);
            jp2.add(button[i]);
            button[i].addActionListener(this);
        }

        con.add(jp3);
        for (int i = 0; i < lettersPanel2.length; i++) {
            JButton button[] = new JButton[lettersPanel3.length];
            button[i] = new JButton(lettersPanel3[i]);
            jp3.add(button[i]);
            button[i].addActionListener(this);
        }
        con.add(jp4);
        for (int i = 0; i < lettersPanel4.length; i++) {
            JButton button[] = new JButton[lettersPanel4.length];
            button[i] = new JButton(lettersPanel4[i]);
            jp4.add(button[i]);
            button[i].addActionListener(this);
        }

        con.add(jp5);
        for (int i = 0; i < lettersPanel5.length; i++) {
            JButton button[] = new JButton[lettersPanel5.length];
            button[i] = new JButton(lettersPanel2[i]);
            jp5.add(button[i]);
            button[i].addActionListener(this);
        }

        jp5.add(jblank1).setVisible(false);
        jp5.add(jblank2).setVisible(false);
        jp5.add(jblank3).setVisible(false);

        setSize(500, 500);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
        setLayout(layout);
    }

    public void actionPerformed(ActionEvent e) {
        JButton src = (JButton) e.getSource();

    }

    public static void main(String[] args) {
        JFileCabinet1 frame = new JFileCabinet1();
        frame.setVisible(true);

    }
}

不，不要在按钮上使用鼠标侦听器。您的

ActionListener

实现很好，

getSource

将为您提供按下的按钮

要将标签设置为按钮的文本，请使用

jl.setText（src.getText（））

inside

actionPerformed

---

如果您想要按钮所在的面板，请使用按钮的

getParent（）

。

事实是，一旦启动

actionPerformed

，您实际上不需要数组，直接用于

ActionListener

，您可以从

ActionEvent

s源属性获取

JButton

，并从按钮提取文本

public void actionPerformed(ActionEvent e) {
    JButton src = (JButton) e.getSource();
    System.out.println(src.getText());
}

现在，如果您希望按钮包含更多信息（或显示的信息不同），可以使用按钮

actionCommand

属性

还有，这个

for (int i = 0; i < lettersPanel2.length; i++) {
    JButton button[] = new JButton[lettersPanel2.length];

简单地说，就像

addButtonsTo(lettersPanel1, jp1);
addButtonsTo(lettersPanel2, jp2);
addButtonsTo(lettersPanel3, jp3);
addButtonsTo(lettersPanel4, jp4);
addButtonsTo(lettersPanel5, jp5);

---

通读一遍，了解更多细节…

事实上，对于

ActionListener

，您实际上不需要直接使用数组，一旦启动

actionPerformed

，您就可以从

ActionEvent

的源属性中获取

JButton

，并从按钮中提取文本

public void actionPerformed(ActionEvent e) {
    JButton src = (JButton) e.getSource();
    System.out.println(src.getText());
}

现在，如果您希望按钮携带更多信息（或不同的信息）