SWing基础

1. JFrame窗口

JFrame窗口继承了Frame，类似于Frame的操作，不同在于需要容器Container放东西，关闭窗口调用默认方法即可

public class JFrameDemo {

    //init()，初始化
    public void init() {
        JFrame jFrame = new JFrame("这是一个JFrame窗口");
        jFrame.setVisible(true);
        jFrame.setBounds(100,100,200,200);
        //jFrame.setBackground(Color.GRAY);
        //设置文字
        JLabel label = new JLabel("welcome~~~");
        jFrame.add(label);
        label.setHorizontalAlignment(SwingConstants.CENTER);

        //容器实例化
        Container container = jFrame.getContentPane();
        container.setBackground(Color.YELLOW);

        //关闭事件
        jFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

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

2. 弹窗Dialog

用来提示信息，默认有关闭事件

public class DialogDemo extends JFrame {
    public DialogDemo()  {
        this.setVisible(true);
        this.setSize(700,500);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        //容器
        Container container = this.getContentPane();
        //绝对布局
        container.setLayout(null);

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

        //点击按钮的时候，弹出弹窗
        button.addActionListener(new ActionListener() {//监听
            @Override
            public void actionPerformed(ActionEvent e) {
                //弹窗
                new MyDialogDemo();
            }
        });
        container.add(button);
    }

    public static void main(String[] args) {
        new DialogDemo();
    }
}
//弹窗的窗口
class MyDialogDemo extends JDialog {
    public MyDialogDemo() {
        this.setVisible(true);
        this.setBounds(100,100,500,500);

        Container container = this.getContentPane();
        container.setLayout(null);
        container.add(new JLabel("Today is Monday"));
    }
}

3. 面板

public class JPanelDemo extends JFrame {
    public JPanelDemo() {
        Container container = this.getContentPane();
        container.setLayout(new GridLayout(2,1,10,10));

        JPanel panel = new JPanel(new GridLayout(1,3));
        panel.add(new JButton("1"));
        panel.add(new JButton("2"));
        panel.add(new JButton("3"));

        container.add(panel);

        this.setVisible(true);
        this.setSize(300,300);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

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

4. 滑窗

public class JScrollDemo extends JFrame {
    public static void main(String[] args) {
        new JScrollDemo();
    }

    public JScrollDemo() {
        Container container = this.getContentPane();

        //文本域
        JTextArea textArea = new JTextArea(20,50);
        textArea.setText("hello JScrollDemo");
        //面板
        JScrollPane scrollPane = new JScrollPane(textArea);
        container.add(scrollPane);

        this.setVisible(true);
        this.setBounds(100,100,300,50);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }
}

5. 单选多选框

public class JRadioButtonDemo extends JFrame {
    public static void main(String[] args) {
        new JRadioButtonDemo();
    }

    public JRadioButtonDemo() {
        Container container = this.getContentPane();
        //单选框
        JRadioButton radioButton1 = new JRadioButton("radioButton1");
        JRadioButton radioButton2 = new JRadioButton("radioButton2");
        JRadioButton radioButton3 = new JRadioButton("radioButton3");
        //由于单选框只能选一个，分组
        ButtonGroup group = new ButtonGroup();
        group.add(radioButton1);
        group.add(radioButton2);
        group.add(radioButton3);

        container.add(radioButton1,BorderLayout.CENTER);
        container.add(radioButton2,BorderLayout.NORTH);
        container.add(radioButton3,BorderLayout.SOUTH);

        //多选框
        JCheckBox checkBox1 = new JCheckBox("checkBox1");
        JCheckBox checkBox2 = new JCheckBox("checkBox2");
        container.add(checkBox1);
        container.add(checkBox2);

        this.setVisible(true);
        this.setSize(500,300);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }
}

6. 下拉框,列表框

public class TestComboxDemo extends JFrame {
    public static void main(String[] args) {
        new TestComboxDemo();
    }

    public TestComboxDemo() {
        Container container = this.getContentPane();

        //生成列表内容
        String[] contents = {"1","2","3"};
        //列表中需要放入内容
        JList list = new JList(contents);
        container.add(list);

        //下拉框
        JComboBox status = new JComboBox();
        status.addItem(null);
        status.addItem("正在热映");
        status.addItem("已经下架");
        status.addItem("即将上映");

        container.add(status);

        this.setVisible(true);
        this.setSize(500,300);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }
}

7. 文本框

• 文本框
• 密码框
• 文本域