java - JFrame - 将复选框添加到屏幕

Question

我想要一个显示 5 个不同复选框的 JFrame。应该能够选择多个复选框。此代码仅读取 ExchangeCard1 行并忽略所有其他复选框。当你运行它时，你将只有一个以“A”为字符的复选框。

JCheckBox ExchangingCard1 = new JCheckBox("A");
JCheckBox ExchangingCard2 = new JCheckBox("B");
JCheckBox ExchangingCard3 = new JCheckBox("C");
JCheckBox ExchangingCard4 = new JCheckBox("D");
JCheckBox ExchangingCard5 = new JCheckBox("E");

JFrame frame = new JFrame();
frame.setSize(500, 500);
frame.setTitle("Exchange.");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.add(ExchangingCard1);
frame.setVisible(true);
frame.add(ExchangingCard2);
frame.setVisible(true);
frame.add(ExchangingCard3);
frame.setVisible(true);
frame.add(ExchangingCard4);
frame.setVisible(true);
frame.add(ExchangingCard5);
frame.setVisible(true);

Answer 1

将复选框放入 JPanel 中，然后将 JPanel 放入 JFrame 中。

这是一个可运行的示例。

package com.ggl.testing;

import java.awt.BorderLayout;

import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

public class CheckBoxTest2 implements Runnable {

    private JFrame frame;

    @Override
    public void run() {
        frame = new JFrame("Check Box Test");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel mainPanel = new JPanel();
        mainPanel.setLayout(new BorderLayout());

        JPanel checkBoxPanel = new JPanel();

        JCheckBox exchangingCard1 = new JCheckBox("A");
        checkBoxPanel.add(exchangingCard1);
        JCheckBox exchangingCard2 = new JCheckBox("B");
        checkBoxPanel.add(exchangingCard2);
        JCheckBox exchangingCard3 = new JCheckBox("C");
        checkBoxPanel.add(exchangingCard3);
        JCheckBox exchangingCard4 = new JCheckBox("D");
        checkBoxPanel.add(exchangingCard4);
        JCheckBox exchangingCard5 = new JCheckBox("E");
        checkBoxPanel.add(exchangingCard5);

        mainPanel.add(checkBoxPanel);

        frame.add(mainPanel);

        frame.pack();
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new CheckBoxTest2());
    }

}