import javax.swing.*;
import java.awt.*;
import java.awt.event.*;class CheckboxPanel extends JPanel {
Icon unchecked=new ToggleIcon(false);
Icon checked=new ToggleIcon(true);
JCheckBox cb1;
JCheckBox cb2;
public CheckboxPanel() {
setLayout(new GridLayout(2,1));
cb1 = new JCheckBox("Choose Me",true);
cb1.setIcon(unchecked);
cb1.setSelectedIcon(checked);
cb2 = new JCheckBox("No Choose Me",false);
cb2.setIcon(unchecked);
cb2.setSelectedIcon(checked);
add(cb1);
add(cb2);
}
}class ToggleIcon implements Icon {
boolean state;
public ToggleIcon(boolean s) {
state=s;
}
public void paintIcon(Component c,Graphics g,int x,int y) {
int width=getIconWidth();
int height=getIconHeight();
g.setColor(Color.black);
if(state) {
g.fillOval(x,y,width,height);
} else {
g.drawOval(x,y,width,height);
}
}
public int getIconWidth() {
return 10;
}
public int getIconHeight() {
return 10;
}
}
public class Example8_26 extends JApplet implements ItemListener {
CheckboxPanel panel1;
JTextField text1;
public void init() {
text1 = new JTextField(null,10);
panel1=new CheckboxPanel();
panel1.add(text1);
add(panel1);
panel1.cb1.addItemListener(this);
panel1.cb2.addItemListener(this);
}
public void itemStateChanged(ItemEvent e) {
if(e.getItemSelectable() == panel1.cb1) {
text1.setText("hehe");
} else {
text1.setText("haha");
}
}
}
import java.awt.*;
import java.awt.event.*;class CheckboxPanel extends JPanel {
Icon unchecked=new ToggleIcon(false);
Icon checked=new ToggleIcon(true);
JCheckBox cb1;
JCheckBox cb2;
public CheckboxPanel() {
setLayout(new GridLayout(2,1));
cb1 = new JCheckBox("Choose Me",true);
cb1.setIcon(unchecked);
cb1.setSelectedIcon(checked);
cb2 = new JCheckBox("No Choose Me",false);
cb2.setIcon(unchecked);
cb2.setSelectedIcon(checked);
add(cb1);
add(cb2);
}
}class ToggleIcon implements Icon {
boolean state;
public ToggleIcon(boolean s) {
state=s;
}
public void paintIcon(Component c,Graphics g,int x,int y) {
int width=getIconWidth();
int height=getIconHeight();
g.setColor(Color.black);
if(state) {
g.fillOval(x,y,width,height);
} else {
g.drawOval(x,y,width,height);
}
}
public int getIconWidth() {
return 10;
}
public int getIconHeight() {
return 10;
}
}
public class Example8_26 extends JApplet implements ItemListener {
CheckboxPanel panel1;
JTextField text1;
public void init() {
text1 = new JTextField(null,10);
panel1=new CheckboxPanel();
panel1.add(text1);
add(panel1);
panel1.cb1.addItemListener(this);
panel1.cb2.addItemListener(this);
}
public void itemStateChanged(ItemEvent e) {
if(e.getItemSelectable() == panel1.cb1) {
text1.setText("hehe");
} else {
text1.setText("haha");
}
}
}
java.lang.Error: Do not use Example8_26.add() use Example8_26.getContentPane().
dd() instead
at javax.swing.JApplet.createRootPaneException(JApplet.java:203)
at javax.swing.JApplet.addImpl(JApplet.java:225)
at java.awt.Container.add(Container.java:307)
at Example8_26.init(Example8_26.java:52)
at sun.applet.AppletPanel.run(AppletPanel.java:353)
at java.lang.Thread.run(Thread.java:534)
却又出现了下面这样的错误,请教各位。
--------------------Configuration: j2sdk1.4.2_05 <Default>--------------------
F:\learning\Example8_26.java:11: cannot resolve symbol
symbol : class getContentPane
location: class CheckboxPanel
Container c=new getContentPane();
^
1 errorProcess completed.
运行的html code是
<htmL>
<head>
<title>Applet Test</title>
</head>
<body>
<applet code="TestApplet" >
</applet>
</body>
</html>
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class ToggleIcon implements Icon
{
boolean state;
public ToggleIcon(boolean s)
{state=s;}
public void paintIcon(Component c,Graphics g,int x,int y)
{int width=getIconWidth();
int height=getIconHeight();
g.setColor(Color.black);
if(state)
g.fillOval(x,y,width,height);
else g.drawOval(x,y,width,height);
}
public int getIconWidth()
{return 10;}
public int getIconHeight()
{return 10;}
}
public class TestApplet extends JApplet implements ItemListener
{
JPanel panel = new JPanel();Icon unchecked=new ToggleIcon(false);
Icon checked=new ToggleIcon(true);
JCheckBox cb1 = new JCheckBox("Choose Me",true);
JCheckBox cb2 = new JCheckBox("No Choose Me",false);
JTextField text1; public void init() {
panel.setLayout(new GridLayout(2,1));
cb1.setIcon(unchecked);
cb1.setSelectedIcon(checked);
cb2.setIcon(unchecked);
cb2.setSelectedIcon(checked);
panel.add(cb1);
panel.add(cb2);
text1=new JTextField(10);
panel.add(text1);
getContentPane().add(panel);
cb1.addItemListener(this);
cb2.addItemListener(this);
} public void itemStateChanged(ItemEvent e)
{if(e.getItemSelectable()==cb1)
text1.setText("hehe");
else text1.setText("haha");
}
}