Swing

 1 public abstract class CenterFrame extends JFrame{
 2     /** 获得系统默认工具箱，用来获得当前屏幕的分辨率 */    
 3     private static Toolkit toolkit = Toolkit.getDefaultToolkit();
 4 
 5     public CenterFrame(int width,int height){
 6         this.setSize(width, height);
 7         this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 8         //1、获得屏幕的分辨率
 9         Dimension screenSize = toolkit.getScreenSize();
10         //2.根据计算，设置当前面板的位置
11         this.setLocation(
12                 ((int)screenSize.getWidth() - this.getWidth())/2,
13                 ((int)screenSize.getHeight() - this.getHeight())/2
14         );
15     }
16 }

 1 public class ImagesDemo extends CenterFrame{
 2     private JLabel lblImage = new JLabel();
 3     
 4     public ImagesDemo(int width, int height) {
 5         super(width, height);
 6         
 7         //实例化图像对象
 8         ImageIcon image = new ImageIcon("images/PersonalInfohead.jpg");
 9         //为标签设置图像
10         lblImage.setIcon(image);
11         //将标签添加到内容面板
12         JPanel contentPane = (JPanel) getContentPane();
13         contentPane.setLayout(null);
14         //设置图像标签的位置和大小
15         lblImage.setBounds(0, 0, 299, 30);
16         //在内容面板上添加图像标签
17         contentPane.add(lblImage);
18         
19         this.setVisible(true);
20     }
21     
22     public static void main(String[] args) {
23         new ImagesDemo(500, 400);
24     }
25 }

 1 public class JComboBoxDemo extends CenterFrame{
 2     private JComboBox<String> cbCity = new JComboBox<String>(
 3             new String[]{"北京","上海","广州","成都","深圳"}
 4     );
 5     
 6     public JComboBoxDemo(int width, int height) {
 7         super(width, height);
 8         initComponent();
 9         setVisible(true);
10     }
11     
12     /**
13      * 初始化组件方法
14      */
15     private void initComponent(){
16         JPanel contentPan = (JPanel) getContentPane();
17         contentPan.setLayout(null);
18         cbCity.setBounds(20, 20, 100, 25);
19         contentPan.add(cbCity);
20         
21         //事件处理
22         cbCity.addActionListener(new ActionListener() {
23             @Override
24             public void actionPerformed(ActionEvent e) {
25                 JOptionPane.showMessageDialog(null, cbCity.getSelectedItem());
26             }
27         });
28     }
29     
30     public static void main(String[] agrs) {
31         new JComboBoxDemo(500, 400);
32     }
33 }
34 
35 public class JLableDemo extends JFrame {
36     private JLabel lblQQId1 = new JLabel("QQ号码：");
37     /*private JLabel lblQQId2 = new JLabel("QQ号码：");
38     private JLabel lblQQId3 = new JLabel("QQ号码：");
39     private JLabel lblQQId4 = new JLabel("QQ号码：");
40     private JLabel lblQQId5 = new JLabel("QQ号码：");*/
41     private JTextField txtqq = new JTextField(25);
42     private JButton btnLogin = new JButton("登录");
43     private JButton btnCancel = new JButton("取消");
44 
45     public JLableDemo() {
46         // 设置窗体默认关闭的操作
47         this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
48         // 设置窗体标题
49         this.setTitle("测试窗体");
50         // 设置窗体大小
51         this.setSize(500, 400);
52         // 设置窗体的显示状态
53         this.setVisible(true);
54         
55         // 获得内容面板，以便在内容面板上添加组件
56         JPanel contentPan = (JPanel) this.getContentPane();
57         // 将内容面板设置为无布局，方便控制组件的位置
58         contentPan.setLayout(null);
59         // 设置标签课件的x,y,宽，高
60         lblQQId1.setBounds(80, 80, 80, 15);
61         txtqq.setBounds(lblQQId1.getX() + lblQQId1.getWidth(), lblQQId1.getY() - 5, 150, 25);
62         btnLogin.setBounds(80, 180, 60, 30);
63         btnCancel.setBounds(260, 180, 60, 30);
64         
65         contentPan.add(lblQQId1);
66         contentPan.add(txtqq);
67         contentPan.add(btnLogin);
68         contentPan.add(btnCancel);
69         
70         //为按钮添加事件处理
71         btnLogin.addActionListener(new ActionListener() {
72             @Override
73             public void actionPerformed(ActionEvent e) {
74                 //当点击btnLogin按钮时，本方法自动调用
75                 System.out.println(txtqq.getText());
76             }
77         });
78         
79         /*
80          * contentPan.add(lblQQId1,BorderLayout.EAST);
81          * contentPan.add(lblQQId2,BorderLayout.WEST);
82          * contentPan.add(lblQQId3,BorderLayout.NORTH);
83          * contentPan.add(lblQQId4,BorderLayout.SOUTH);
84          * contentPan.add(lblQQId5,BorderLayout.CENTER);
85          */
86     }
87 
88     public static void main(String[] args) {
89         new JLableDemo();
90     }
91 }

 1 public class JScrollPaneDemo extends CenterFrame{
 2     private JTextArea txtContent = new JTextArea("协议内容...");
 3 //    private JCheckBox chkFav= new JCheckBox("篮球");
 4     public JScrollPaneDemo(int width, int height) {
 5         super(width, height);
 6         
 7         //为多行文本框添加滚动面板--固定代码
 8         JScrollPane scrollPane = new JScrollPane();
 9         //将文本框控件添加到滚动面板组件上
10         scrollPane.getViewport().add(txtContent);
11         //将滚动面板添加到内容面板上
12         getContentPane().add(scrollPane);
13         
14         /*//获得复选框是否被选中
15         chkFav.isSelected();    
16         getContentPane().add(chkFav);*/
17         
18         this.setVisible(true);
19     }
20 
21     public static void main(String[] args) {
22         new JScrollPaneDemo(500, 400);
23     }
24 }

 1 /**
 2  * 用来演示Java面板的基本用法
 3  * @author Administrator
 4  * extends JFrame 可以关掉窗口
 5  * @author Administrator
 6  * extends Frame  不可以关掉窗口
 7  */
 8 public class MainFrame extends JFrame{
 9     //当前登录用户的qq号码
10     private String currLoginId = null;
11     
12     public MainFrame(String currLoginId){
13         if (currLoginId == null) {
14             this.currLoginId = "1000";
15         } else {
16             this.currLoginId = currLoginId;
17         }
18         
19         //设置窗体默认关闭的操作
20         this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
21         //设置窗体标题
22         this.setTitle("测试窗体");
23         //设置窗体大小
24         this.setSize(500, 400);
25         //设置窗体的显示状态
26         this.setVisible(true);
27     }
28 }