GUI 的核心技术 Swing

我们知道AWT是在java.awt包下那么同理Swing应该在 javax.swing包下

建立一个JFrame窗口

public class JFrameDemo {
    public static void main(String[] args) {
        //JFrameDemo.init(); //是init()方法静态然后通过类名直接调用
        //建立一个窗口
        new JFrameDemo().init();
    }

    // 初始化 init()
    public void init() {
        JFrame jFrame = new JFrame("这是一个JFrame窗口");
        //窗口的大小
        jFrame.setBounds(100,100,400,400);
        //窗口的大小不变
        jFrame.setResizable(false);
        //窗口的可见
        jFrame.setVisible(true);
        //标签
        JLabel jLabel = new JLabel("这是一个JLabel");
        //把标签添加到窗口中
        jFrame.add(jLabel);
        //标签在窗口的中间
        jLabel.setHorizontalAlignment(SwingConstants.CENTER);
        //获得一个容器
        Container container = jFrame.getContentPane();
        container.setBackground(Color.green);
        //关闭窗口
        jFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }
}

面板

public class JFrameDemo2 {
    public static void main(String[] args) {
        /**
         * 面板
         */
        JFrameDemo2.init();
    }
    public static void init() {
        JFrame jFrame = new JFrame();
        //窗口的大小
        jFrame.setBounds(100,100,400,400);
        //获得一个容器
        Container container = jFrame.getContentPane();
        container.setBackground(Color.green);
        //设置布局
        container.setLayout(null);
        //窗口的可见
        jFrame.setVisible(true);
        JPanel jPanel = new JPanel();
        //面板的大小
        jPanel.setBounds(50,50,100,100);
        //面板的背景
        jPanel.setBackground(Color.red);
        jFrame.add(jPanel);
        //关闭窗口
        jFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

    }
}

弹窗

public class DialogDemo {
    public static void main(String[] args) {
        /**
         * 弹窗
         */
      new DialogDemo2().init();

    }
}

class  DialogDemo2 extends JFrame {
    public  void init() {
        //窗口的大小
        this.setBounds(100, 100, 400, 400);
        //窗口的可见
        setVisible(true);
        //获得一个容器
        Container container = this.getContentPane();
        container.setLayout(null);

	//创建按钮对象
        JButton jButton = new JButton("点我");
        //设置按钮的大小
        jButton.setBounds(50, 50, 100, 100);
        container.add(jButton);
        //按钮被监听
        jButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                new MyDialogDemo();
            }
        });
    }
}

class MyDialogDemo extends JDialog {
    public MyDialogDemo() {
        //弹窗的大小
        this.setBounds(400, 400, 500, 500);
        //弹窗的可见
        this.setVisible(true);
        //混的一个容器
        Container container = this.getContentPane();
        //设置布局
        container.setLayout(null);
        //添加标签
        container.add(new Label("你来了"));
    }

}

标签 (ICON 图片) 图片放在标签上

public class IconDemo extends JFrame implements Icon {
    private int width;
    private int heigth;
    //无参构造
    public IconDemo() {}

    //有参构造
    public IconDemo(int width, int heigth) {
        this.width=width;
        this.heigth=heigth;
    }

    public void init() {
        IconDemo iconDemo = new IconDemo(15, 15);
        //图标放在标签，也可以放在按钮上！
        JLabel label = new JLabel("icontest", iconDemo, SwingConstants.CENTER);
	//获得容器
        Container container = getContentPane();
        //添加标签
        container.add(label);
	//窗口可见
        this.setVisible(true);
        //关闭窗口
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }
    public static void main(String[] args) {
        //实例化
        new IconDemo().init();
    }


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

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

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

获得ICON图片

public class ImageIconDemo extends JFrame {
    public void init() {
        JLabel label = new JLabel("ImageIconDemo");
        //获取图片地址
        URL url = ImageIconDemo.class.getResource("tx.jpg");
        ImageIcon imageIcon = new ImageIcon(url);
        label.setIcon(imageIcon);

	//标签布局
        label.setHorizontalAlignment(SwingConstants.CENTER);
        //获得容器
        Container container = getContentPane();
        //添加标签
        container.add(label);

	//设置窗口的大小
        setBounds(100,100,200,200);
        //窗口的可见
        setVisible(true);
        //关闭窗口
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

    }

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

JPanel 面板

public class JpanelDemo extends JFrame {
    public JpanelDemo() {
        //窗口的大小
        this.setBounds(100,100,400,400);
        //窗口的可见
        this.setVisible(true);
        //关闭窗口
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        Container container = this.getContentPane();
        container.setBackground(Color.green);

        container.setLayout(new GridLayout(2, 1, 10, 10)); //后面的参数的意思，间距
        container.setLayout(null);

        JPanel panel1 = new JPanel(new GridLayout(1, 3));
        JPanel panel2 = new JPanel(new GridLayout(1, 2));
        JPanel panel3 = new JPanel(new GridLayout(2, 1));
        JPanel panel4 = new JPanel(new GridLayout(3, 2));

        panel1.add(new JButton("1"));
        panel1.add(new JButton("1"));
        panel1.add(new JButton("1"));

        panel2.add(new JButton("2"));
        panel2.add(new JButton("2"));

        panel3.add(new JButton("3"));
        panel3.add(new JButton("3"));

        panel4.add(new JButton("4"));
        panel4.add(new JButton("4"));
        panel4.add(new JButton("4"));
        panel4.add(new JButton("4"));
        panel4.add(new JButton("4"));
        panel4.add(new JButton("4"));


        container.add(panel1);
        container.add(panel2);
        container.add(panel3);
        container.add(panel4);

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

图片按钮

public class JButtonDemo01 extends JFrame {
    public JButtonDemo01() {
        Container container = this.getContentPane();
        //将一个图片变为图标
        URL resource = JButtonDemo01.class.getResource("tx.jpg");
        Icon icon = new ImageIcon(resource);

        //把这个图标放在按钮上
        JButton button = new JButton();
        button.setIcon(icon);
        button.setToolTipText("图片按钮");

        //add
        container.add(button);
        //窗口的可见
        this.setVisible(true);
        //窗口的大小
        this.setSize(500, 500);
        //关闭窗口
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }
    public static void main(String[] args) {
        /**
         * 按钮
         */
        new JButtonDemo01();
    }
}

列表

下拉框

public class TestComboboxDemo01 extends JFrame {
    public TestComboboxDemo01() {
        //获得一个容器
        Container container = this.getContentPane();
        JComboBox status = new JComboBox();
        status.addItem(null);
        status.addItem("正在热映");
        status.addItem("已下架");
        status.addItem("即将上映");


        container.add(status);
        //窗口的可见
        this.setVisible(true);
        //窗口的大小
        this.setSize(500, 500);
        //关闭窗口
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
        new TestComboboxDemo01();
    }
}

列表框

public class TestComboboxDemo02 extends JFrame {
    /**
     * 列表框
     */
    public TestComboboxDemo02() {
        Container container = this.getContentPane();
        Vector vector = new Vector();
        JList jList = new JList(vector);
        vector.add("张三");
        vector.add("李四");
        vector.add("王五");
        container.add(jList);

        //窗口的可见
        this.setVisible(true);
        //窗口的大小
        this.setSize(500, 500);
        //关闭窗口
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }
    public static void main(String[] args) {
        new TestComboboxDemo02();
    }
}

文本框

public class TestTextDemo01 extends JFrame {
    public TestTextDemo01() {
        //获得一个容器
        Container container = this.getContentPane();

        JTextField textField = new JTextField("背景");
        JTextField textField1 = new JTextField("你好", 10);
        container.add(textField,BorderLayout.NORTH);
        container.add(textField1,BorderLayout.SOUTH);


        //窗口的可见
        this.setVisible(true);
        //窗口的大小
        this.setSize(500, 500);
        //关闭窗口
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
        new TestTextDemo01();
    }
}

密码框

public class TestTextDemo02 extends JFrame {
    /**
     * 密码框
     */
    public TestTextDemo02() {
        Container container = this.getContentPane();
        JPasswordField passwordField = new JPasswordField();
        passwordField.setEchoChar('*');
        container.add(passwordField);

        //窗口的可见
        this.setVisible(true);
        //窗口的大小
        this.setSize(500, 500);
        //关闭窗口
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
        new TestTextDemo02();
    }
}