java新手 关于GridBagLayout的问题

Question

正在学习java.awt的部分，尝试做GridBagLayout的时候遇到了这样的问题

 import java.awt.*;
import java.awt.event.*;

public class GridBagLayoutTest extends Frame{
    Label l1,l2,l3,l4;
    TextField tf1,tf2,tf3;
    Button btn1,btn2;
    CheckboxGroup cbg;
    Checkbox cb1,cb2,cb3,cb4;
    GridBagLayout gb;
    GridBagConstraints gbc;
    public GridBagLayoutTest (String title) {
        super(title);
        l1=new Label("用户名");
        l2=new Label("密码");
        l3=new Label("重复密码");
        l4=new Label("获取途径");
        tf1=new TextField(20);
        tf2=new TextField(20);
        tf3=new TextField(20);
        gb=new GridBagLayout();
        setLayout(gb);
        gbc=new GridBagConstraints();
        Panel p=new Panel();
        cbg=new CheckboxGroup();
        cb1=new Checkbox("搜索",cbg,false);
        cb2=new Checkbox("广告",cbg,false);
        cb3=new Checkbox("朋友",cbg,false);
        cb4=new Checkbox("其他",cbg,false);
        p.add(cb1);
        p.add(cb2);
        p.add(cb3);
        p.add(cb4);
        btn1=new Button("提交");
        btn2=new Button("重置");
        Panel p1=new Panel();
        p1.add(btn1);
        p1.add(btn2);
        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
        gbc.fill=GridBagConstraints.HORIZONTAL;
        addComponent(l1,0,0,1,1);
        addComponent(tf1,0,2,1,4);
        addComponent(l2,1,0,1,1);
        addComponent(tf2,1,2,1,4);
        addComponent(l3,2,0,1,1);
        addComponent(tf3,2,2,1,4);
        addComponent(l4,4,0,1,1);
        addComponent(p,4,2,1,1);
        addComponent(p1,5,2,1,5);
    }
    public void addComponent(Component c, int row, int col, int nrow, int ncol) {
        gbc.gridx=col;
        gbc.gridy=row;
        gbc.gridheight=ncol;
        gbc.gridwidth=nrow;
        gb.setConstraints(c, gbc);
        add(c);
    }
    public static void main(String []args) {
        GridBagLayoutTest gblt=new GridBagLayoutTest("GridBag Layout");
        gblt.setSize(300,200);
        gblt.setVisible(true);
    }
}

这段代码运行之后的变成了这个样子，不知道该如何解决，谢谢。

Answer 1

gblt.setSize(300,200);高度更改一下