java - 将 JLabel 设置为 JTextArea 顶部并向下移动 JTextArea

Question

当我制作时，我有一个包含 JPanel 的小型 GUI，其中有 JTextArea 和 JLabel

panel1.setLayout(null);

我可以完成所需的位置，但 JTextArea 消失了!当我做时

panel1.setLayout((LayoutManager) new FlowLayout(FlowLayout.LEFT));

我可以同时获得 Jlabel and JTextArea可见但无法获取位置，如何获取所需的位置集，我是新手!请帮助!谢谢

代码:

private void createPageScreen1() {
    panel1 = new JPanel();
    panel1.setLayout((LayoutManager) new FlowLayout(FlowLayout.LEFT));
    //panel1.setLayout(null);
    //panel1.setLayout(new BorderLayout());


    JLabel lblProcessingData = new JLabel();
    //lblProcessingData.setBounds(5, 5, 15, 10);
    lblProcessingData.setLocation(5, 5);
    lblProcessingData.setText("label for Title");
    panel1.add(lblProcessingData);

    String fileName = "loadFiles\\testFile.txt";

    try {
        textArea = new JTextArea(40, 37);
        //textArea.setBounds(5, 20, 40, 37);
        textArea.setBorder (new TitledBorder (new EtchedBorder(), fileName));
        textArea.setLineWrap(true);
        textArea.setEditable(false);
        textArea.setVisible(true);

        FileReader reader = new FileReader(fileName);
        BufferedReader br = new BufferedReader(reader);
        textArea.read(br, null);
        br.close();
        textArea.requestFocus();

        JScrollPane scroll1 = new JScrollPane(textArea);
        scroll1.setVerticalScrollBarPolicy (ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
        panel1.add(scroll1);
    } catch (Exception e) {

        e.printStackTrace();
    }
    panel1.setVisible(true);
}

Answer 1

对于这种类型的程序，文件内容显示和标签，BorderLayout比较适合。

private void createPageScreen1()
{
    panel1 = new JPanel();
    // Use BorderLayout
    panel1.setLayout(new BorderLayout());

    JLabel lblProcessingData = new JLabel();
    lblProcessingData.setText("label for Title");
    // Add Label to top
    lblProcessingData.setBorder(new EmptyBorder(5, 5, 5, 5));
    panel1.add(lblProcessingData, BorderLayout.NORTH);

    String fileName = "loadFiles\\testFile.txt";

    try
    {
        textArea = new JTextArea(40, 37);
        textArea.setBorder(new TitledBorder(new EtchedBorder(), fileName));
        textArea.setLineWrap(true);
        textArea.setEditable(false);
        textArea.setVisible(true);

        FileReader reader = new FileReader(fileName);
        BufferedReader br = new BufferedReader(reader);
        textArea.read(br, null);
        br.close();
        textArea.requestFocus();

        JScrollPane scroll1 = new JScrollPane(textArea);
        scroll1.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
        // Fill remaining space with TextArea
        panel1.add(scroll1, BorderLayout.CENTER);
    }
    catch (Exception e)
    {

        e.printStackTrace();
    }
    panel1.setVisible(true);
}