清华大学：JAVA教学课件：8-3

程序8-3：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
public class TwoStatesButtonDemo2 {
JFrame frame = new JFrame ("Two States Button Demo 2");
JCheckBox cb1 = new JCheckBox("JCheckBox 1");
JCheckBox cb2 = new JCheckBox("JCheckBox 2");
JCheckBox cb3 = new JCheckBox("JCheckBox 3");
JCheckBox cb4 = new JCheckBox("JCheckBox 4");
JCheckBox cb5 = new JCheckBox("JCheckBox 5");
JCheckBox cb6 = new JCheckBox("JCheckBox 6");
JRadioButton rb1 = new JRadioButton("JRadioButton 1");
JRadioButton rb2 = new JRadioButton("JRadioButton 2");
JRadioButton rb3 = new JRadioButton("JRadioButton 3");

JRadioButton rb4 = new JRadioButton("JRadioButton 4");
JRadioButton rb5 = new JRadioButton("JRadioButton 5");
JRadioButton rb6 = new JRadioButton("JRadioButton 6");

JTextArea ta = new JTextArea(); //用于显示结果的文本区
public static void main(String args[]) {
TwoStatesButtonDemo2 ts = new TwoStatesButtonDemo2();
ts.go();
}
public void go() {
JPanel p1 = new JPanel();
JPanel p2 = new JPanel();
JPanel p3 = new JPanel();
JPanel p4 = new JPanel();
JPanel p5 = new JPanel();
JPanel pa = new JPanel();
JPanel pb = new JPanel();

p1.add(cb1);
p1.add(cb2);
p1.add(cb3);
Border etched = BorderFactory.createEtchedBorder();
Border border = BorderFactory.createTitledBorder(etched,"JCheckBox");
p1.setBorder(border); //设置边框
p2.add(cb4);
p2.add(cb5);
p2.add(cb6);
border = BorderFactory.createTitledBorder(etched,"JCheckBox Group");
p2.setBorder(border); //设置边框

//创建ButtonGroup按钮组，并在组中添加按钮
ButtonGroup group1 = new ButtonGroup();
group1.add(cb4);
group1.add(cb5);
group1.add(cb6);

p3.add(rb1);
p3.add(rb2);
p3.add(rb3);
border = BorderFactory.createTitledBorder(etched,"JRadioButton");
p3.setBorder(border); //设置边框
p4.add(rb4);
p4.add(rb5);
p4.add(rb6);
border = BorderFactory.createTitledBorder(etched,"JRadioButton Group" );
p4.setBorder(border); //设置边框

//创建ButtonGroup按钮组，并在组中添加按钮
ButtonGroup group2 = new ButtonGroup();
group2.add(rb4);
group2.add(rb5);
group2.add(rb6);
JScrollPane jp = new JScrollPane(ta);
p5.setLayout(new BorderLayout());
p5.add(jp);
border = BorderFactory.createTitledBorder(etched,"Results");
p5.setBorder(border); //设置边框
ItemListener il = new ItemListener() {
public void itemStateChanged(ItemEvent e) {
JCheckBox cb = (JCheckBox) e.getSource(); //取得事件源
if (cb == cb1) {
ta.append("\n JCheckBox Button 1 "+ cb1.isSelected());
} else if (cb == cb2) {
ta.append("\n JCheckBox Button 2 "+ cb2.isSelected());
} else if (cb == cb3) {
ta.append("\n JCheckBox Button 3 "+ cb3.isSelected());
} else if (cb == cb4) {
ta.append("\n JCheckBox Button 4 "+ cb4.isSelected());
} else if (cb == cb5) {
ta.append("\n JCheckBox Button 5 "+ cb5.isSelected());
} else {
ta.append("\n JCheckBox Button 6 "+ cb6.isSelected());
}
}
};
cb1.addItemListener(il);
cb2.addItemListener(il);
cb3.addItemListener(il);
cb4.addItemListener(il);
cb5.addItemListener(il);
cb6.addItemListener(il);
ActionListener al = new ActionListener() {
public void actionPerformed(ActionEvent e) {
JRadioButton rb = (JRadioButton) e.getSource(); //取得事件源
if (rb == rb1) {
ta.append("\n You selected Radio Button 1 "+ rb1.isSelected());
} else if (rb == rb2) {
ta.append("\n You selected Radio Button 2 "+ rb2.isSelected());
} else if (rb == rb3) {
ta.append("\n You selected Radio Button 3 "+ rb3.isSelected());
} else if (rb == rb4) {
ta.append("\n You selected Radio Button 4 "+ rb4.isSelected());
} else if (rb == rb5) {
ta.append("\n You selected Radio Button 5 "+ rb5.isSelected());
} else {
ta.append("\n You selected Radio Button 6 "+ rb6.isSelected());
}
}
};
rb1.addActionListener(al);
rb2.addActionListener(al);
rb3.addActionListener(al);
rb4.addActionListener(al);
rb5.addActionListener(al);
rb6.addActionListener(al);

pa.setLayout(new GridLayout(0,1));
pa.add(p1);
pa.add(p2);
pb.setLayout(new GridLayout(0,1));
pb.add(p3);
pb.add(p4);

Container cp = frame.getContentPane();
cp.setLayout(new GridLayout(0,1));
cp.add(pa);
cp.add(pb);
cp.add(p5);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
}