Question

java swing 怎样实现复选框复选状态的保存？

在窗体1上放置一些复选框，点击确定，调转到窗体2，在窗体2上点击返回窗体1，并且复选框被选的状态仍保存着。

Answer 1

我觉得如果使用Swing开发程序，你必须学会使用BeansBinding。BeansBinding能够将JavaBean的属性值绑定在一起。比如说有两个Bean，一个是你的数据Model，一个是JCheckbox。那么，你可以将JcheckBox的selected属性绑定到数据Model的一个属性上。这样，无特殊需要的多数情况下你就不必去关心JCheckBox是否被勾选，只需要关心数据Model的状态了。 使用BeansBinding，你必须引入appframework和beansbinding两个包。具体的下载，你可以到Maven库中查询并下载（google “maven repos”就能找到很多Maven库了）。 举个简单的例子 import javax.swing.JFrame; import org.jdesktop.beansbinding.BeanProperty; import org.jdesktop.beansbinding.Binding; import org.jdesktop.beansbinding.BindingGroup; import org.jdesktop.beansbinding.Bindings; import org.jdesktop.beansbinding.AutoBinding.UpdateStrategy; import javax.swing.JPanel; import java.awt.BorderLayout; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.JTextField; import javax.swing.JCheckBox; public class Swing8{ /** * 一个非常简单的JavaBean，POJO。当作数据Model */ public class Computer{ private boolean huihuai; // 是否坏了 private String pinpai; // 品牌 private String huihuaiyuanyin; // 毁坏原因 private String yonghu; // 谁的电脑 public boolean isHuihuai() { return huihuai; } public void setHuihuai(boolean huihuai) { this.huihuai = huihuai; } public String getPinpai() { return pinpai; } public void setPinpai(String pinpai) { this.pinpai = pinpai; } public String getHuihuaiyuanyin() { return huihuaiyuanyin; } public void setHuihuaiyuanyin(String huihuaiyuanyin) { this.huihuaiyuanyin = huihuaiyuanyin; } public String getYonghu() { return yonghu; } public void setYonghu(String yonghu) { this.yonghu = yonghu; } public String toString(){ return "Computer当前属性值是：\n" + "yonghu: " + yonghu + "\n" + "pinpai: " + pinpai + "\n" + "huihuai: " + huihuai + "\n" + "huihuaiyuanyin: " + huihuaiyuanyin; } } public Swing8(){ // 创建一个Frame final JFrame frame = new JFrame("BeansBinding 示例"); frame.setBounds(100, 100, 500, 380); final JPanel panel = new JPanel(); frame.getContentPane().add(panel, BorderLayout.CENTER); panel.setLayout(new GridLayout(4, 2, 2, 2)); JLabel label = new JLabel("谁的电脑："); panel.add(label); final JTextField ut; // 用户 final JTextField bt; // 品牌 final JCheckBox cb; // 是否坏了 final JTextField rt; // 毁坏原因 final Computer c = new Computer(); // 创建一个Model ut = new JTextField(); panel.add(ut); ut.setColumns(10); JLabel label_1 = new JLabel("电脑品牌:"); panel.add(label_1); bt = new JTextField(); panel.add(bt); bt.setColumns(10); cb = new JCheckBox("是否坏了"); panel.add(cb); JLabel label_2 = new JLabel(""); panel.add(label_2); JLabel label_3 = new JLabel("毁坏原因："); panel.add(label_3); rt = new JTextField(); panel.add(rt); rt.setColumns(10); // 绑定属性 BindingGroup bg = new BindingGroup(); // 绑定组，绑定的内容都要在绑定组中。 // 使用Bindings.createAutoBinding静态方法创建一个绑定实例。 // UpdateStrategy.READ_WRITE 绑定策略，读写 // ut 绑定源对象 // BeanProperty.create("text") 绑定源的属性 // c 绑定目标对象 // BeanProperty.create("yonghu") 绑定目标属性 // 将ut的text属性绑定到c的yonghu属性上。 Binding userBind = Bindings.createAutoBinding(UpdateStrategy.READ_WRITE, ut, BeanProperty.create("text"), c, BeanProperty.create("yonghu")); // 将绑定实例放入绑定组。 bg.addBinding(userBind); // 下面的类似，不再详细写 // ut.text -> c.pinpai bg.addBinding(Bindings.createAutoBinding(UpdateStrategy.READ_WRITE, bt, BeanProperty.create("text"), c, BeanProperty.create("pinpai"))); // rt.text -> c.huihuaiyuanyin bg.addBinding(Bindings.createAutoBinding(UpdateStrategy.READ_WRITE, rt, BeanProperty.create("text"), c, BeanProperty.create("huihuaiyuanyin"))); // cb.selected -> c.huihuai bg.addBinding(Bindings.createAutoBinding(UpdateStrategy.READ_WRITE, cb, BeanProperty.create("selected"), c, BeanProperty.create("huihuai"))); // 若程序有需求，只有当勾选了“是否坏了”CheckBox，才能输入"毁坏原因"，怎么办？ // 好办，将cb.selected绑定到rt的enabled属性上。 bg.addBinding(Bindings.createAutoBinding(UpdateStrategy.READ_WRITE, cb, BeanProperty.create("selected"), rt, BeanProperty.create("enabled"))); // 重要的一句话，让版定生效 bg.bind(); //好吧，我们再加一个按钮，看看效果如何。 JButton button = new JButton("查看绑定效果"); button.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { JOptionPane.showMessageDialog(frame, c.toString(), "Model属性值列表", JOptionPane.INFORMATION_MESSAGE); } }); frame.getContentPane().add(button, BorderLayout.SOUTH); frame.setVisible(true); } public static void main(String args[]){ new Swing8(); } } ~

Answer 2

提供参考代码。
窗体1
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

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

public class MainGUI extends JFrame {

private static JPanel panel;
private static JButton btn2;
private static JCheckBox chk;
private static MainGUI frame;

public static void main(String[] args) {
createGUI();
}

public static void createGUI() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
frame = new MainGUI();
frame.setTitle("window1");
frame.setSize(100,200);

panel = new JPanel();
chk = new JCheckBox("test");
chk.setSelected(true);
btn2 = new JButton("set invisible");

btn2.addActionListener(new ActionListener() {

@Override
public void actionPerformed(ActionEvent arg0) {
frame.setVisible(false);
CopyOfMainGUI frame2 = new CopyOfMainGUI(frame);
frame2.createGUI();
}

});

FlowLayout layout = new FlowLayout();
layout.setAlignment(0);
panel.setLayout(layout);
panel.add(chk);

frame.add(panel, BorderLayout.CENTER);
frame.add(btn2, BorderLayout.NORTH);
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}

}

}
窗体2
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.HeadlessException;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.UIManager;

public class CopyOfMainGUI extends JFrame {
private static JButton btn;
private CopyOfMainGUI frame2;
private MainGUI frame1;

public CopyOfMainGUI(MainGUI frame) {
frame1 = frame;
}

public void createGUI() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
frame2 = new CopyOfMainGUI(frame1);
frame2.setTitle("window2");
frame2.setSize(200, 200);
btn = new JButton("set visible");
btn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
try {
frame1.setVisible(true);
frame2.setVisible(false);
} catch (HeadlessException e) {
e.printStackTrace();
}
}
});
FlowLayout layout = new FlowLayout();
layout.setAlignment(0);
frame2.add(btn, BorderLayout.SOUTH);
frame2.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
}