大哥们，帮忙看看我这段简单的java代码哪里错了，我凌乱了。。

Question

大哥们，帮忙看看我这段简单的java代码哪里错了，我凌乱了。。运行ButtonGroup.java，错误如下：
        at ButtonGroup.makeBPanel(ButtonGroup.java:12)
        at ButtonGroup.<init>(ButtonGroup.java:35)
        at ButtonGroup.makeBPanel(ButtonGroup.java:12)
        at ButtonGroup.<init>(ButtonGroup.java:35)
        at ButtonGroup.makeBPanel(ButtonGroup.java:12)
        at ButtonGroup.<init>(ButtonGroup.java:35)
        at ButtonGroup.makeBPanel(ButtonGroup.java:12)
        at ButtonGroup.<init>(ButtonGroup.java:35)
        at ButtonGroup.makeBPanel(ButtonGroup.java:12)
        at ButtonGroup.<init>(ButtonGroup.java:35)
        at ButtonGroup.makeBPanel(ButtonGroup.java:12)
        at ButtonGroup.<init>(ButtonGroup.java:35)
        at ButtonGroup.makeBPanel(ButtonGroup.java:12)
        at ButtonGroup.<init>(ButtonGroup.java:35)
        at ButtonGroup.makeBPanel(ButtonGroup.java:12)
        at ButtonGroup.<init>(ButtonGroup.java:35)
        at ButtonGroup.makeBPanel(ButtonGroup.java:12)
        at ButtonGroup.<init>(ButtonGroup.java:35)
        at ButtonGroup.makeBPanel(ButtonGroup.java:12)
        at ButtonGroup.<init>(ButtonGroup.java:35)
        at ButtonGroup.makeBPanel(ButtonGroup.java:12)
        at ButtonGroup.<init>(ButtonGroup.java:35)
        at ButtonGroup.makeBPanel(ButtonGroup.java:12)
        at ButtonGroup.<init>(ButtonGroup.java:35)
        at ButtonGroup.makeBPanel(ButtonGroup.java:12)
        at ButtonGroup.<init>(ButtonGroup.java:35)import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
import java.lang.reflect.*;
import static net.mindview.SwingConsole.*;public class ButtonGroup extends JFrame{ private static String[] ids = {"A","B","C","D"};

static JPanel makeBPanel(Class<? extends AbstractButton> kind,String[] ids){
ButtonGroup bg = new ButtonGroup();

JPanel jp = new JPanel();
String title = kind.getName();
title = title.substring(title.lastIndexOf('.')+1);
jp.setBorder(new TitledBorder(title)); //for(String id : ids){
AbstractButton ab = new JButton("failed");
// try{
// Constructor ctor = kind.getConstructor(String.class);
// ab = (AbstractButton)ctor.newInstance(id);
// }catch(Exception ex){
// System.err.println("can't create kind :"+ kind);
// }
bg.add(ab);
jp.add(ab);
//}
return jp;
}

public ButtonGroup(){
setLayout(new FlowLayout());
add(makeBPanel(JButton.class,ids));
//add(makeBPanel(JToggleButton.class,ids));
//add(makeBPanel(JCheckBox.class,ids));
//add(makeBPanel(JRadioButton.class,ids));
} public static void main(String[] args){
run(new ButtonGroup(),500,500);
}
}package net.mindview;
import javax.swing.*;public class SwingConsole{
public static void run(final JFrame f,final int width,final int  height){
SwingUtilities.invokeLater(new Runnable(){
public void run(){
f.setTitle(f.getClass().getSimpleName());
f.setSize(width,height);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
}
});
}
}

Answer 1

你ButtonGroup初始化的时候调用了makeBPanel方法， 在makeBPanel中你又new了ButtonGroup ， buttonGroup中又会去调用makeBPanel方法，在makeBPanel中你又new了ButtonGroup ， buttonGroup中又会去调用makeBPanel方法，在makeBPanel中你又new了ButtonGroup ， buttonGroup中又会去调用makeBPanel方法，在makeBPanel中你又new了ButtonGroup ， buttonGroup中又会去调用makeBPanel方法，在makeBPanel中你又new了ButtonGroup ， buttonGroup中又会去调用makeBPanel方法，在makeBPanel中你又new了ButtonGroup ， buttonGroup中又会去调用makeBPanel方法，在makeBPanel中你又new了ButtonGroup ， buttonGroup中又会去调用makeBPanel方法，在makeBPanel中你又new了ButtonGroup ， buttonGroup中又会去调用makeBPanel方法，
到最后线程栈资源不足异常就出现了