public void init(){ cbGroup = new CheckboxGroup();
cbWin98 = new Checkbox("Window 98",cbGroup,true); cbWinNT = new Checkbox("Window NT/2000",cbGroup,false); cbSolaris = new Checkbox("Solaris",cbGroup,false); cbMac = new Checkbox("Mac",cbGroup,false);
然后调用add()方法添加按钮对象就可以啦
//</applet>
import java.applet.*;
import java.awt.*;
import java.awt.event.*;public class CBGroup extends Applet implements ItemListener {
String msg = "";
Checkbox cbWin98,cbWinNT,cbSolaris,cbMac;
CheckboxGroup cbGroup ;
public void init(){
cbGroup = new CheckboxGroup();
cbWin98 = new Checkbox("Window 98",cbGroup,true);
cbWinNT = new Checkbox("Window NT/2000",cbGroup,false);
cbSolaris = new Checkbox("Solaris",cbGroup,false);
cbMac = new Checkbox("Mac",cbGroup,false);
cbWin98.addItemListener(this);
cbWinNT.addItemListener(this);
cbSolaris.addItemListener(this);
cbMac.addItemListener(this);
// add Checkbox to appelt window
add(cbWin98);
add(cbWinNT);
add(cbSolaris);
add(cbMac);
}
public void itemStateChanged(ItemEvent event){
repaint();
}
public void paint(Graphics g){
Dimension dSize = this.getSize();
msg = cbGroup.getSelectedCheckbox().getLabel();
// 在中央输出
drawCenterString(msg,dSize.width,dSize.height,g);
}
// 在屏幕中央输出字符串
public void drawCenterString(String message,int cxClient,int cyClient,Graphics g){
FontMetrics fMetrics = g.getFontMetrics();
// 获取输出坐标
int cx = ( cxClient - fMetrics.stringWidth(message) )/2 ;
int cy = fMetrics.getAscent() + (cyClient - (fMetrics.getAscent()+fMetrics.getDescent()))/2 ;
g.drawString(message,cx,cy);
}
}
运行如下:
F:\>javac CBGroup.javaF:\>appletviewer CBGroup.javaF:\>
还要请问, 到底能不能实现?!还是多谢yuzl32(Hello!有酒醉)