Swing

Swing是AWT的封装。

1. 窗口JFrame

public class Demo11 {
    public static void main(String[] args) {
        new MyJFrame2().init();
    }

}

class MyJFrame2 extends JFrame {
    public void init() {

        JLabel jLabel = new JLabel("这是一个标签", SwingConstants.CENTER);
        add(jLabel);

        // 获得一个容器
        Container container = getContentPane();
        container.setBackground(Color.CYAN);

          // 设置默认点击x的事件
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 200, 300);
        setVisible(true);

    }
}

2. 弹窗Dialog

public class Demo12 extends JFrame {

    public Demo12() {
        // JFrame 放东西 容器
        Container contentPane = getContentPane();
        contentPane.setLayout(null);

        // 按钮
        JButton jButton = new JButton("点击弹出一个对话框");
        jButton.setBounds(30, 30, 200, 50);

        // 点击这个按钮的时候弹出一个弹窗
        // 这里用了lambda表达式，相当于
//        jButton.addActionListener(
//                new ActionListener() {
//                    @Override
//                    public void actionPerformed(ActionEvent e) {
//                        new MyDialog()
//                    }
//                }
//        );
        jButton.addActionListener(e -> new MyDialog());

        contentPane.add(jButton);

        setBounds(100, 100, 700, 500);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setVisible(true);
    }

    public static void main(String[] args) {
        new Demo12();
    }


}

// 弹窗的窗口
class MyDialog extends JDialog {
    public MyDialog() {
        setVisible(true);
        setBounds(100, 100, 500, 500);

        Container contentPane = getContentPane();
        contentPane.add(new JLabel("这是一个标签"));

    }
}

3. 标签

label

new JLabel("xxx");

图标icon

public class Demo13 extends JFrame implements Icon {

    private int width;
    private int height;

    // 无参构造
    public Demo13(){
    }

    public Demo13(int width, int height){
        this.width = width;
        this.height = height;
    }

    public void init(){
        Demo13 iconDemo = new Demo13(15, 15);
        // 图标放在标签 也可以放在按钮上
        JLabel jLabel = new JLabel("icontest", iconDemo, SwingConstants.CENTER);

        Container contentPane = getContentPane();
        contentPane.add(jLabel);

        setVisible(true);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }


    public static void main(String[] args) {
        new Demo13().init();
    }

    @Override
    public void paintIcon(Component c, Graphics g, int x, int y) {
        g.fillOval(x, y, width, height);
    }

    @Override
    public int getIconWidth() {
        return width;
    }

    @Override
    public int getIconHeight() {
        return height;
    }
}

图片icon

public class ImageIconDemo extends JFrame {
    public ImageIconDemo() {
        JLabel jLabel = new JLabel("ImageIcon");
        // 获取图片的地址
        // 获取当前类下的资源
        URL url = getClass().getResource("avatar.png");

        assert url != null;
        ImageIcon imageIcon = new ImageIcon(url);
        jLabel.setIcon(imageIcon);
        jLabel.setHorizontalAlignment(SwingConstants.CENTER);

        Container contentPane = getContentPane();
        contentPane.add(jLabel);

        setVisible(true);
        setBounds(100, 100, 200, 200);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
        new ImageIconDemo();
    }
}

4. 面板

JPanel

public class Demo14 extends JFrame {
    public Demo14() {
        Container contentPane = getContentPane();
        // 2行1列 垂直水平间距10
        contentPane.setLayout(new GridLayout(2, 1, 10, 10));

        JPanel jPanel1 = new JPanel(new GridLayout(1, 3));
        JPanel jPanel2 = new JPanel(new GridLayout(1, 2));
        JPanel jPanel3 = new JPanel(new GridLayout(2, 1));
        JPanel jPanel4 = new JPanel(new GridLayout(3, 2));

        jPanel1.add(new JButton("1"));
        jPanel1.add(new JButton("1"));
        jPanel1.add(new JButton("1"));
        jPanel2.add(new JButton("2"));
        jPanel2.add(new JButton("2"));
        jPanel3.add(new JButton("3"));
        jPanel3.add(new JButton("3"));
        jPanel4.add(new JButton("4"));
        jPanel4.add(new JButton("4"));
        jPanel4.add(new JButton("4"));
        jPanel4.add(new JButton("4"));
        jPanel4.add(new JButton("4"));
        jPanel4.add(new JButton("4"));

        contentPane.add(jPanel1);
        contentPane.add(jPanel2);
        contentPane.add(jPanel3);
        contentPane.add(jPanel4);

        setVisible(true);
        setBounds(100, 100, 400, 400);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);


    }

    public static void main(String[] args) {
        new Demo14();
    }
}

JScoll

public class Demo15 extends JFrame {
    public Demo15() {
        Container contentPane = getContentPane();

        // 文本域
        JTextArea jTextArea = new JTextArea(20, 50);
        jTextArea.setText("这是一个文本域");

        JScrollPane jScrollPane = new JScrollPane(jTextArea);

        contentPane.add(jScrollPane);

        setBounds(100, 100, 300, 350);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setVisible(true);
    }

    public static void main(String[] args) {
        new Demo15();
    }
}

5. 按钮

图片按钮

public class Demo16 extends JFrame {
    public Demo16() {
        Container contentPane = getContentPane();

        // 讲一个图片变为图标
        URL resource = getClass().getResource("avatar.png");
        ImageIcon imageIcon = new ImageIcon(resource);

        // 把这个图标放在按钮上
        JButton jButton = new JButton();
        jButton.setIcon(imageIcon);
        jButton.setToolTipText("把一个图片变成按钮");

        contentPane.add(jButton);

        setVisible(true);
        setBounds(100, 100, 200, 200);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

    }

    public static void main(String[] args) {
        new Demo16();
    }
}

• 单选

public class Demo17 extends JFrame {
    public Demo17() {
        Container contentPane = getContentPane();

        URL resource = getClass().getResource("avatar.png");
        ImageIcon imageIcon = new ImageIcon(resource);

        // 单选框
        JRadioButton jRadioButton1 = new JRadioButton("JRadioButton1");
        JRadioButton jRadioButton2 = new JRadioButton("jRadioButton2");
        JRadioButton jRadioButton3 = new JRadioButton("jRadioButton3");

        // 默认选中
        jRadioButton1.setSelected(true);

        // 由于单选框只能选择一个 分组 一个分组中只能选择一个
        ButtonGroup buttonGroup = new ButtonGroup();
        buttonGroup.add(jRadioButton1);
        buttonGroup.add(jRadioButton2);
        buttonGroup.add(jRadioButton3);

        contentPane.add(jRadioButton1, BorderLayout.CENTER);
        contentPane.add(jRadioButton2, BorderLayout.NORTH);
        contentPane.add(jRadioButton3, BorderLayout.SOUTH);


        setVisible(true);
        setBounds(100, 100, 500, 500);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

    }

    public static void main(String[] args) {
        new Demo17();
    }
}

• 复选

public class Demo18 extends JFrame {
    public Demo18() {
        Container contentPane = getContentPane();

        // 多选框
        JCheckBox jCheckBox1 = new JCheckBox("jCheckBox1");
        JCheckBox jCheckBox2 = new JCheckBox("jCheckBox2");

        contentPane.add(jCheckBox1, BorderLayout.NORTH);
        contentPane.add(jCheckBox2, BorderLayout.SOUTH);


        setVisible(true);
        setBounds(100, 100, 200, 200);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
        new Demo18();
    }
}

6. 列表

• 下拉框

public class Demo19 extends JFrame {
    public Demo19() {
        Container contentPane = getContentPane();

        // 下拉列表框
        JComboBox<Object> status = new JComboBox<>();
        status.addItem("正在热映");
        status.addItem("已下架");
        status.addItem("即将上映");

        contentPane.add(status);

        setVisible(true);
        setBounds(100, 100, 200, 200);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
        new Demo19();
    }
}

• 列表框

public class Demo20 extends JFrame {
    public Demo20() {
        Container contentPane = getContentPane();

        // 生成列表的内容
        // String[] contents = {"1", "2", "3"};

        Vector<String> contents = new Vector<>();

        JList<String> stringJList = new JList<>(contents);

        contents.add("1");
        contents.add("2");
        contents.add("3");

        contentPane.add(stringJList);

        setVisible(true);
        setBounds(100, 100, 200, 200);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);


    }

    public static void main(String[] args) {
        new Demo20();
    }
}

7. 文本框

• 文本框
• 密码框
• 文本域

public class Demo21 extends JFrame {

    public Demo21() {
        Container contentPane = getContentPane();

        // 文本框
        JTextField jTextField = new JTextField("hello");
        JTextField jTextField2 = new JTextField("world");

        contentPane.add(jTextField, BorderLayout.NORTH);
        contentPane.add(jTextField2, BorderLayout.SOUTH);

        // 密码框
        JPasswordField jPasswordField = new JPasswordField("password");
        jPasswordField.setEchoChar('*');
        contentPane.add(jPasswordField, BorderLayout.CENTER);

        // 文本域
        JTextArea jTextArea = new JTextArea("这是一个文本域");
        contentPane.add(jTextArea, BorderLayout.EAST);

        setVisible(true);
        setBounds(100, 100, 200, 200);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
        new Demo21();
    }
}