nulllayoutdemo.java

电子工业出版社出版的《java2应用开发指南》配套光盘源代码

//NullLayoutDemo.java
import java.awt.*;
import java.awt.event.*;

public class NullLayoutDemo extends Frame
{
	Label lblUserName = new Label("用户名称：");
    TextField txtUserName = new TextField();
    Label lblUserPasswd = new Label("用户密码：");
    TextField txtUserPasswd = new TextField();
    Button btnLogin = new Button("登录");
    Button btnReset = new Button("重设");
    
	public NullLayoutDemo()
	{
		//设置框架窗口的布局管理器为null布局管理器
		this.setLayout(null);
		//手工设置各个组件的位置和大小
        lblUserName.setBounds(new Rectangle(45, 38, 67, 34));
        txtUserName.setBounds(new Rectangle(115, 39, 210, 33));
        lblUserPasswd.setBounds(new Rectangle(43, 86, 66, 26));
        txtUserPasswd.setBounds(new Rectangle(115, 84, 210, 33));
		txtUserPasswd.setEchoChar('*');
        btnLogin.setBounds(new Rectangle(78, 150, 86, 30));
        btnReset.setBounds(new Rectangle(193, 150, 86, 30));
		//把各个组件添加到框架窗口中
        this.add(lblUserName);
        this.add(txtUserName);
        this.add(lblUserPasswd);
        this.add(txtUserPasswd);
        this.add(btnLogin);
        this.add(btnReset);
        
	}
	public static void main( String[] args )
	{
		NullLayoutDemo frmNullLayout=new NullLayoutDemo();
		
		//设置框架窗体的事件监听(关闭窗体事件)
		frmNullLayout.addWindowListener(new WindowAdapter(){
			public void windowClosing(WindowEvent e)
			{
				System.exit(0);
			}
		});

		//显示框架窗体
		frmNullLayout.pack();
		frmNullLayout.show();
	}
	//设置框架窗口的大小
	public Dimension getPreferredSize()
	{
		return new Dimension(355, 204);
	}
}