nulllayout.java

这是清华大学编写的JAVA教材中所有题目的源代码！

import java.awt.*;

class NullLayout
{
	public static void main(String args[])
	{
		Frame f=new Frame("正在测试空布局管理器!");

		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");

		//设置框架窗口的布局管理器为null布局管理器
		f.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
        f.add(lblUserName);
        f.add(txtUserName);
        f.add(lblUserPasswd);
        f.add(txtUserPasswd);
        f.add(btnLogin);
        f.add(btnReset);

		f.setSize(355,204);
		f.setVisible(true);
	}
}