JAVA 窗口应用

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package myproject;import java.awt.Dimension;import java.awt.Toolkit;import java.util.Random;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPasswordField;import javax.swing.JTextField;public class windows {public static void main(String[] args) {JFrame windows=new JFrame("登录窗口");windows.setVisible(true);windows.setSize(400, 250);Toolkit kit = Toolkit.getDefaultToolkit();    // 定义工具包     Dimension screenSize = kit.getScreenSize();   // 获取屏幕的尺寸    int screenWidth = screenSize.width/2;         // 获取屏幕的宽    int screenHeight = screenSize.height/2;       // 获取屏幕的高    int height = windows.getHeight();    int width = windows.getWidth();    windows.setLocation(screenWidth-width/2, screenHeight-height/2);windows.setResizable(true);windows.setLayout(null);JLabel label1=new JLabel("用户名:");label1.setBounds(50, 20, 50, 20);windows.add(label1);     JTextField texbook1=new JTextField();texbook1.setBounds(100, 20,150, 20);windows.add(texbook1);JLabel label2=new JLabel("密码:  ");label2.setBounds(50, 50, 50, 20);windows.add(label2);JPasswordField password1=new JPasswordField(10);password1.setEchoChar('*');password1.setBounds(100, 50,150, 20);windows.add(password1);JLabel label3=new JLabel("验证码:");label3.setBounds(50, 80, 50, 20);windows.add(label3);JTextField texbook2=new JTextField();texbook2.setBounds(100, 80,50, 20);windows.add(texbook2);Random rd=new Random();JLabel label4=new JLabel(Integer.toString(rd.nextInt(8999)+1000));label4.setBounds(200, 80, 40, 20);windows.add(label4);JButton button1=new JButton("确定");button1.setBounds(50, 120, 60, 20);windows.add(button1);JButton button2=new JButton("重置");button2.setBounds(120, 120, 60, 20);windows.add(button2);JButton button3=new JButton("取消");button3.setBounds(190, 120, 60, 20);windows.add(button3);}}<img src="http://img.blog.csdn.net/20141120133819693?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvbW96dW54/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />
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