[scjp问题] 关于组件显示问题
import java.awt.*;
public class Test1 extends Frame
{
public Test1()
{
add(new Button("a"));
add(new Button("b"));
add(new Button("c"));
pack();
setVisible(true);
}
public static void main(String[] a){
new Test1();
}
}
???????为什么只是显示标签为"c"的按钮阿
import java.awt.*;
public class Test1 extends Frame
{
public Test1()
{
Panel p=new Panel();
p.add(new Button("a"));
p.add(new Button("b"));
p.add(new Button("c"));
add(p);
//pack();
setVisible(true);
}
public static void main(String[] a){
new Test1();
}
}
???????这样才可以显示3个按钮