//: checkboxes.javaimport javax.swing.*;
import java.awt.*;
import java.awt.event.*;public class CheckBoxes extends JApplet {
private JTextArea t = new JTextArea("JTextArea",6,15);
private JCheckBox
cb1 = new JCheckBox("Check Box 1"),
cb2 = new JCheckBox("Check Box 2"),
cb3 = new JCheckBox("Check Box 3");
public void init() {
cb1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
trace("1",cb1);
}
});
cb2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
trace("2",cb2);
}
});
cb3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
trace("3",cb3);
}
});
Container cp = getContentPane();
cp.setLayout(new FlowLayout());
cp.add(new JScrollPane(t));
cp.add(cb1);
cp.add(cb2);
cp.add(cb3);
}
private void trace(String b,JCheckBox cb) {
if(cb.isSelected())
t.append("Box "+b+" Set\n");
else
t.append("Box "+b+" cleared\n");
}
public static void main(String[] args) {
Console.run(new CheckBoxes(),200,200);
}
}/*-----------------------------------------------------------------------------
编译后出现错误:
D:\java\c14\c565>javac checkboxes.java
checkboxes.java:43: cannot find symbol
symbol : variable Console
location: class CheckBoxes
Console.run(new CheckBoxes(),200,200);
^
1 error
--请问这是什么原因?如果把下面句子删了,在IE上又可以打开
public static void main(String[] args) {
Console.run(new CheckBoxes(),200,200);
}
------------------------------------------------------------------------------*/
import java.awt.*;
import java.awt.event.*;public class CheckBoxes extends JApplet {
private JTextArea t = new JTextArea("JTextArea",6,15);
private JCheckBox
cb1 = new JCheckBox("Check Box 1"),
cb2 = new JCheckBox("Check Box 2"),
cb3 = new JCheckBox("Check Box 3");
public void init() {
cb1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
trace("1",cb1);
}
});
cb2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
trace("2",cb2);
}
});
cb3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
trace("3",cb3);
}
});
Container cp = getContentPane();
cp.setLayout(new FlowLayout());
cp.add(new JScrollPane(t));
cp.add(cb1);
cp.add(cb2);
cp.add(cb3);
}
private void trace(String b,JCheckBox cb) {
if(cb.isSelected())
t.append("Box "+b+" Set\n");
else
t.append("Box "+b+" cleared\n");
}
public static void main(String[] args) {
Console.run(new CheckBoxes(),200,200);
}
}/*-----------------------------------------------------------------------------
编译后出现错误:
D:\java\c14\c565>javac checkboxes.java
checkboxes.java:43: cannot find symbol
symbol : variable Console
location: class CheckBoxes
Console.run(new CheckBoxes(),200,200);
^
1 error
--请问这是什么原因?如果把下面句子删了,在IE上又可以打开
public static void main(String[] args) {
Console.run(new CheckBoxes(),200,200);
}
------------------------------------------------------------------------------*/
//: Box1.javaimport javax.swing.*;
import java.awt.*;public class Box1 extends JApplet {
public void init() {
Box bv = Box.createVerticalBox();
for(int i=0; i<5; i++)
bv.add(new JButton("bv"+i)); Box bh = Box.createHorizontalBox();
for(int i=0; i<5; i++)
bh.add(new JButton("bh"+i));
Container cp = getContentPane();
cp.add(BorderLayout.EAST,bv);
cp.add(BorderLayout.SOUTH,bh);
}
public static void main(String[] args) {
Console.run(new Box1(),450,200);
}
}