能帮我看看这个错误(有全代码，只99行)(swing)！

Question

是这样的：
你没有把布局管理设为GridBagLayout，然后就直接用了，因此会出现这种异常！
因此，可以在init()方法的最前面加一句：
this.getContentPane().setLayout(new GridBagLayout());另外，main()方法中加上下面的语句，以便于显示：
        gbc.setBounds(100,100,300,300);
        gbc.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        gbc.show();

Answer 1

关于 GridBagLayout一下两下说不清，给你段我的代码你研究一下吧//设置northPane,northPane是一个JPanel
northPane.setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.weightx=0;
gbc.weighty=0;
gbc.fill = GridBagConstraints.NONE;gbc.insets = new Insets(0,10,0,0);
gbc.gridwidth=6;//µÚ1ÐÐ
gbc.gridheight=1;
gbc.anchor = GridBagConstraints.NORTHWEST;
northPane.add(gongju,gbc);gbc.gridwidth=4;//µÚ2ÐÐ
gbc.gridx=0;
northPane.add(groupName,gbc);
gbc.gridwidth=2;
gbc.gridx=4;
northPane.add(changeGroupName,gbc);
gbc.insets = new Insets(5,10,0,0);gbc.gridwidth=4; //µÚ3ÐÐ
gbc.gridheight = 3;
gbc.gridx=0;
northPane.add(listScrollPane,gbc);
gbc.gridwidth = 2;
gbc.gridheight = 1;
gbc.gridx = 4;
northPane.add(addGongJu,gbc);
gbc.gridwidth = 2;
gbc.gridheight = 1;
northPane.add(remove,gbc);
gbc.gridwidth = 1;
gbc.gridheight = 1;
gbc.gridx = 4;
northPane.add(upDone,gbc);
gbc.gridwidth = 1;
gbc.gridheight = 1;
gbc.gridx = 5;
northPane.add(downDone,gbc);gbc.insets = new Insets(5,10,0,0);
gbc.gridwidth=1;//µÚ4ÐÐ
gbc.gridx=0;
northPane.add(menuText,gbc);
gbc.gridwidth = 5;
gbc.gridx=1;
northPane.add(menuTextField,gbc);gbc.gridwidth=1;//µÚ5ÐÐ
gbc.gridx=0;
northPane.add(order,gbc);
gbc.gridwidth = 5;
gbc.gridx=1;
northPane.add(orderField,gbc);gbc.gridwidth=1;//µÚ6ÐÐ
gbc.gridx=0;
northPane.add(canshu,gbc);
gbc.gridwidth = 5;
gbc.gridx=1;
northPane.add(canshuField,gbc);gbc.gridwidth=1;//µÚ7ÐÐ
gbc.gridx=0;
northPane.add(beginDirector,gbc);
gbc.gridwidth = 4;
gbc.gridx=1;
northPane.add(beginDirectorField,gbc);
gbc.gridwidth = 1;
gbc.gridx=5;
northPane.add(selectDirector,gbc);
自己弄出来理解的就会更透彻，祝愿你成功