一个java 小程序的显示问题！
package cn.junco.checkboxgoup;
import java.awt.Checkbox;
import java.awt.CheckboxGroup;
import java.awt.Frame;
import java.awt.Label;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class CheckboxDemo extends Frame {
public static final long serialVersionUID=1L;
public CheckboxDemo() {
// TODO Auto-generated constructor stub
String []university={ "Tsinghua ", "Tianjin ", "tju ", "whu "};
Checkbox[] C=new Checkbox[4];
Label manu=new Label( "The name of the university ");
CheckboxGroup c=new CheckboxGroup();
add(manu);
for (int i=0;i <4;i++)
{
C[i]=new Checkbox(university[i],c,false);
add(C[i]);
}
pack();
setVisible(true);
addWindowListener(new Win());
}
public static void main(String[] args) {
// TODO Auto-generated method stub
new CheckboxDemo();
}
public class Win extends WindowAdapter
{
public void windowClosing(WindowEvent e) {
// TODO Auto-generated method stub
System.exit(0);
}
}
}
为什么窗口上面显示的结果只有一个whu啊？
[解决办法]
你没有设置Layout(布局),因此前面的被覆盖掉了,改为下
public CheckboxDemo() {
// TODO Auto-generated constructor stub
String []university={ "Tsinghua ", "Tianjin ", "tju ", "whu "};
this.setLayout(new GridLayout(5,1));
Checkbox[] C=new Checkbox[4];
Label manu=new Label( "The name of the university ");
CheckboxGroup c=new CheckboxGroup();
add(manu);
for (int i=0;i <4;i++)
{
C[i]=new Checkbox(university[i],c,false);
add(C[i]);
}
pack();
setVisible(true);
addWindowListener(new Win());
}
-----------------
其实只加了一句,this.setLayout(new GridLayout(5,1));
当然,你可以换成别的Layout manager,
[解决办法]
同意楼上
布局弄好了就行了。
别忘了加上
import java.awt.GridLayout;
[解决办法]
你没设布局管理器,我觉得用FlowLayout比较好,另外感觉一个一个类的import进来麻烦,干脆一次性都import算了
import java.awt.*;
import java.awt.event.*;
public class CheckboxDemo extends Frame {
public static final long serialVersionUID=1L;
public CheckboxDemo() {
// TODO Auto-generated constructor stub
this.setLayout(new FlowLayout());
String []university={ "Tsinghua ", "Tianjin ", "tju ", "whu "};
Checkbox[] C=new Checkbox[4];
Label manu=new Label( "The name of the university ");
CheckboxGroup c=new CheckboxGroup();
add(manu);
for (int i=0;i <4;i++)
{
C[i]=new Checkbox(university[i],c,false);
add(C[i]);
}
pack();
setVisible(true);
addWindowListener(new Win());
}
public static void main(String[] args) {
// TODO Auto-generated method stub
new CheckboxDemo();
}
public class Win extends WindowAdapter
{
public void windowClosing(WindowEvent e) {
// TODO Auto-generated method stub
System.exit(0);
}
}
}
[解决办法]
up 帮顶
[解决办法]
Frame默认使用BorderLayout，后面的将前面的覆盖了。。。
[解决办法]
同意!
[解决办法]
就是这样啊
[解决办法]
up
