import java.awt.*;
public class Comp1{
public static void main (String args[]){
Button b1=new Button("test1");
Button b2=new Button("test2");
Frame f = new Frame("test");
Panel p = new Panel();
p.add(b1);
p.add(p);
f.pack();
f.setVisible(true);
}
}
报的错是:
Exception in thread "main" java.lang.IllegalArgumentException: adding container
s parent to itself
at java.awt.Container.addImpl(Container.java:1017)
at java.awt.Container.add(Container.java:352)
at Comp1.main(Comp1.java:9)
各位帮忙看下,谢了!
public class Comp1{
public static void main (String args[]){
Button b1=new Button("test1");
Button b2=new Button("test2");
Frame f = new Frame("test");
Panel p = new Panel();
p.add(b1);
p.add(p);
f.pack();
f.setVisible(true);
}
}
报的错是:
Exception in thread "main" java.lang.IllegalArgumentException: adding container
s parent to itself
at java.awt.Container.addImpl(Container.java:1017)
at java.awt.Container.add(Container.java:352)
at Comp1.main(Comp1.java:9)
各位帮忙看下,谢了!
p.add(b1);
p.add(p);
f.pack();
p.add(b1);
p.add(b2);
f.add(p);
f.pack();
f.setVisible(true);
这是你的本意吧?
public class Comp1{
public static void main (String args[]){
Button b1=new Button("test1");
Button b2=new Button("test2");
Frame f = new Frame("test");
Panel p = new Panel();
p.add(b1);
f.getContentPanel().add(p);
f.pack();
f.setVisible(true);
}
} 这样才对
import java.awt.*;
public class Comp1{
public static void main (String args[]){
Button b1=new Button("test1");
Button b2=new Button("test2");
Frame f = new Frame("test");
Panel p = new Panel();
p.add(b1);
f.getContentPanel().add(p); //这里将Panel加到顶级容器中
f.pack();
f.setVisible(true);
}
}