Question

我已经阅读了有关JTextArea的其他问题并将setVisible（true）移到了底部，但我的JTextArea仍然不允许我显示文本。我的代码如下，它是扩展JPanel的类的构造函数，当我输入JTextArea时它不会显示任何内容。 JTextArea出现在中间，称为“newText”。谢谢你的帮助！

EditScreen(TaskMaster taskMaster, Task toEdit){
        this.taskMaster = taskMaster;
        editingTask = toEdit;
        textAreaShading = new Color(10, 20, 20, 20);
        initBackground();
        this.setLayout(new BorderLayout(500,500));
        this.setBackground(background); //this might not be initializedset

        topToolbar = new JPanel();
        topToolbar.setBorder(BorderFactory.createEmptyBorder(5,5,5,5)); 
        topToolbar.setOpaque(false);
        topToolbar.setLayout(new BoxLayout(topToolbar, BoxLayout.X_AXIS));
        category = new JLabel("Choose type:");
        categories = new JComboBox(catS);
        date = new JTextField(10);
        topToolbar.add(category);
        topToolbar.add(categories);
        topToolbar.add(new JLabel("Due Date:"));
        topToolbar.add(date);


        textPanel = new JPanel();
        //textPanel.setLayout(new BoxLayout(textPanel, BoxLayout.Y_AXIS));  
        textPanel.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));   
        textPanel.setLayout(new BorderLayout());  
        //textPanel.setOpaque(false);
        textPanel.setBackground(Color.CYAN);
        newText = new JTextArea();
        newText.setOpaque(true);
        newText.setBackground(textAreaShading);
        newText.setLineWrap(true);
        newText.setWrapStyleWord(true); 
        textPanel.add(BorderLayout.CENTER, newText);


        bottomPanel = new JPanel();
        bottomPanel.setBorder(BorderFactory.createEmptyBorder(5,5,2,0)); 
        bottomPanel.setOpaque(false);
        bottomPanel.setLayout(new BoxLayout(bottomPanel, BoxLayout.X_AXIS));
        priority = new JComboBox(priorityS); 
        cancel = new JButton("Cancel");
        save = new JButton("Save");
        bottomPanel.add(new JLabel("Choose Priority:"));
        bottomPanel.add(priority);
        bottomPanel.add(cancel);
        bottomPanel.add(save);


        //set layout and size of frame
        this.add(topToolbar,BorderLayout.NORTH);
        this.add(textPanel, BorderLayout.CENTER); 
        //screenPanel.add(newText, BorderLayout.CENTER); 
        this.add(bottomPanel, BorderLayout.SOUTH);

        initListeners();
        initEditingTask();
        this.setVisible(true);
        textPanel.setVisible(true);
        newText.setVisible(true);
    }

Answer 1

好的，有人回答了我的问题，然后删除了这个回复，所以我会在这里发布，这不是我的做法，但这是程序的问题，所以在这里！

setLayout（new BorderLayout（500,500））;在这个封面上留下了很大的空白。

解决方案：缩小差距

setLayout（new BorderLayout（5,5））;

Code Riddle：已完成。谢谢大家！

JTextArea不允许输入文本

1 个答案: