GUI Swing 3.4 面板

3.4 面板

JPanel

public class TestJPanel extends JFrame {
    public TestJPanel(){

        Container container = this.getContentPane();
        container.setLayout(new GridLayout(3,2));
        JPanel jPanel = new JPanel(new GridLayout(2,2));
        jPanel.add(new JButton("1"));
        jPanel.add(new JButton("2"));
        jPanel.add(new JButton("3"));
        container.add(jPanel);
        setBounds(200,200,600,600);
        setVisible(true);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

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

JScrollPanel(滚动条面板)

public class TestScroll extends JFrame {
    public TestScroll() {
        //容器
        Container container = getContentPane();

        //文本域
        JTextArea textArea = new JTextArea(30,50);//字数30行，50列
        textArea.setText("你好，加油！！！");

        //滚动条面板
        JScrollPane jScrollPane = new JScrollPane(textArea);
        //jScrollPane.add(textArea);不可以这样
        container.add(jScrollPane);

        setVisible(true);
        setBounds(200,200,500,500);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

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