GUI05-Swing01

3.Swing

3.1窗口 、 容器

public class JFrameDemo {
    //init(); 初始化
    public void init(){
        JFrame frame = new JFrame("这是第一个JFrame窗口");
        frame.setVisible(true);
        frame.setBounds(100,100,200,200);
        //设置文字
        JLabel label = new JLabel("欢迎来到相亲大会");
        //让文本标签居中 设置水平对齐
        label.setHorizontalAlignment(SwingConstants.CENTER);
        frame.add(label);
        Container contentPane = frame.getContentPane();
        contentPane.setBackground(Color.cyan);
        //关闭事件
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
        //创建一个窗口
        new JFrameDemo().init();
    }
}

3.2弹窗

JDialog，，用来被弹出，默认就有关闭事件

//主方法
public class DialogDemo extends JFrame {
    public DialogDemo(){
        setVisible(true);
        setBounds(100,100,700,500);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        //JFrame放东西 容器
        Container container = getContentPane();
        container.setLayout(null);

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

        //点击按钮触发弹窗
        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                new MyDialogDemo();
            }
        });
        container.add(button);
    }

    public static void main(String[] args) {
        new DialogDemo();
    }
}
//弹出窗口
class MyDialogDemo extends JDialog{
    public MyDialogDemo() {
        this.setVisible(true);
        this.setBounds(100,100,500,500);
        //this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        Container container = this.getContentPane();
        container.setLayout(null);
        container.add(new JLabel("狂神最帅"));
    }
}

3.3 标签

lable

JLable lable = new JLable("xxxx");

图标Icon

//图标需要实现类，Frame继承
public class IconDemo extends JFrame implements Icon {
    private int width;
    private int height;

    public IconDemo(){
    }

    public IconDemo(int width, int height) {
        this.width = width;
        this.height = height;
    }
    public void init(){
        IconDemo iconDemo = new IconDemo(15,15);
        //图标可以放在标签上，也可以放在按钮上
        JLabel label = new JLabel("icontest", iconDemo, SwingConstants.CENTER);
        Container container = getContentPane();
        container.add(label);
        this.setVisible(true);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }
    @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;
    }
    public static void main(String[] args) {
        new IconDemo().init();
    }
}

图片Icon

public class ImageIconDemo extends JFrame {
    public ImageIconDemo(){
        //获取图片地址
        JLabel label = new JLabel("ImageIcon");
        URL url = ImageIconDemo.class.getResource("male.gif");
        ImageIcon icon = new ImageIcon(url);
        label.setIcon(icon);
        label.setHorizontalAlignment(SwingConstants.CENTER);
        Container container = getContentPane();
        container.add(label);
        this.setVisible(true);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        this.setBounds(100,100,200,200);
    }

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