javaGUI 最基础的界面 标签、输入框、按钮、事件处理 模板

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//GUI界面 package CallName; import java.awt.Toolkit; import java.awt.event.*;   import javax.swing.*;   public class CallNamePage extends JFrame {     JTextField txt11 = new JTextField();     JButton btn = new JButton("按钮");       public CallNamePage() {         super("标题");         JLabel lab = new JLabel("标签：");         lab.setBounds(50, 40, 40, 40);         txt11.setBounds(90, 40, 40, 40);         btn.setBounds(130, 40, 80, 40);           //事件         btn.addActionListener(new ActionListener() {             public void actionPerformed(ActionEvent ee) {                 JOptionPane.showMessageDialog(null, "事件");             }         });         // 将控件添加到容器         JPanel p = new JPanel();         p.setLayout(null);         // 布局标题         p.add(lab);         p.add(txt11);         p.add(btn);         getContentPane().add(p);         setSize(400, 400);         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);         setVisible(true);       }       // 程序入口     public static void main(String[] args) {         CallNamePage s = new CallNamePage();         s.CenterPanel();     }       // 将界面开始位置显示到屏幕中间     public void CenterPanel() {         int width = Toolkit.getDefaultToolkit().getScreenSize().width;         int height = Toolkit.getDefaultToolkit().getScreenSize().height;         this.setLocation(width / 2, height / 4);     }   }