gridbagapp.java

java课程的资料以及实验的代码

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

class GridBagApp extends Frame
{
	TextArea txtArea;
	TextField txtField;
	Button btn1, btn2;
	CheckboxGroup cbg;
	Checkbox cb1, cb2, cb3, cb4;
	GridBagLayout gbLayout;
	GridBagConstraints gbc;
	
	public GridBagApp(String title)
	{
		super(title);
		gbLayout = new GridBagLayout();
		setLayout(gbLayout);
		
		gbc = new GridBagConstraints();
		txtArea = new TextArea("文本区", 5, 10);
		txtField = new TextField("请输入你的姓名：");
		btn1 = new Button("确定");
		btn2 = new Button("取消");
		
		cbg = new CheckboxGroup();
		cb1 = new Checkbox("粗体", cbg, false);
		cb2 = new Checkbox("斜体", cbg, false);
		cb3 = new Checkbox("普通", cbg, true);
		cb4 = new Checkbox("粗斜体", cbg, false);
		
		//gbc.ipadx = 50;    // 指定单元格最小宽度
		//gbc.ipady = 50;    // 指定单元格最低高度
		//gbc.weightx = 10;  // 打开水平自动伸缩
		//gbc.weighty = 5;   // 打开垂直自动伸缩
		
		gbc.fill = GridBagConstraints.BOTH;
		addComponent(txtArea,0,0,4,1);
		
		gbc.fill = GridBagConstraints.HORIZONTAL;
		addComponent(btn1,0,1,1,1);
		
		gbc.fill = GridBagConstraints.HORIZONTAL;
		addComponent(btn2,0,2,1,1);
		
		gbc.fill = GridBagConstraints.HORIZONTAL;
		addComponent(cb1,2,1,1,1);
		
		gbc.fill = GridBagConstraints.HORIZONTAL;
		addComponent(cb2,2,2,1,1);
		
		gbc.anchor = GridBagConstraints.SOUTH;  // 放在单元格底部
		gbc.fill = GridBagConstraints.HORIZONTAL;
		addComponent(cb3,3,1,1,1);
		
		gbc.fill = GridBagConstraints.HORIZONTAL;
		addComponent(cb4,3,2,1,1);
		
		gbc.fill = GridBagConstraints.BOTH;
		addComponent(txtField,4,0,1,3);
		
		// 添加关闭窗口事件代码
        this.addWindowListener
        (
            new WindowAdapter() {
                public void windowClosing(WindowEvent e) {
                    System.exit(0);  // 退出应用程序
                }
            }
        );  
    }
    
	public void addComponent(Component c, int row, int col, int rowspan, int colspan)
	{
		gbc.gridx = col;
		gbc.gridy = row;
		
		gbc.gridwidth = colspan;
		gbc.gridheight = rowspan;
		
		gbLayout.setConstraints(c, gbc);
		add(c);
	}
	
	public static void main(String args[])
	{
		GridBagApp f=new GridBagApp("测试GridBag布局！");
		
		f.setSize(300,300);
		f.setLocation(360,200);
		f.setVisible(true);
	}
}