带有 GridLayout(1,1) 的滚动条

Question

在这里，我正在使用 Swing 编写 Java 程序，但遇到了一些麻烦。我可以在我的文本区域添加滚动条：

    //Text area
    public static JTextArea output = new JTextArea("======================== The Outputs HERE ================================");

   // JBouton 
   private JButton bouton = new JButton();
   private JButton tpBouton = new JButton("TP 205");

   // JLabel
   private JLabel label = new JLabel("TP DE 205");
   public static JLabel initialState = new JLabel("TEST");
   public static JLabel state = new JLabel("");
   public static JLabel tableShow = new JLabel("Entrer l'element a rechercher : ");
   public static JLabel finalState = new JLabel("");
   private JLabel explicitText = new JLabel();

   // JTextField
   private JFormattedTextField input = new JFormattedTextField(NumberFormat.getIntegerInstance());
    //JTextField input = new JTextField("Choisir l'element a rechercher ...");

   // JPanel
   JPanel mainBGRadio = new JPanel();
   JPanel secondBGRadio = new JPanel();
   JPanel b7 = new JPanel();
   JPanel main = new JPanel();
   JPanel container = new JPanel();
   JPanel outPutField = new JPanel();

   // Ensemble
   private Ensemble set = new Ensemble();

   // JRadioButton

   // for the main group
   private JRadioButton lookup = new JRadioButton("Look Up");
   private JRadioButton insert = new JRadioButton("Insert");
   private JRadioButton delete = new JRadioButton("Delete");
   private JRadioButton difference = new JRadioButton("Difference");
   private JRadioButton intersection = new JRadioButton("Intersection");
   private JRadioButton union = new JRadioButton("Union");

   // for the second group

   private JRadioButton sortedList = new JRadioButton("liste Trie");
   private JRadioButton simpleList = new JRadioButton("liste Simple");
   private JRadioButton doubleList = new JRadioButton("liste Avec Doublons");
   private JRadioButton simpleVector = new JRadioButton("vecteur Simple");
   private JRadioButton sortedVector = new JRadioButton("vecteur Trie");
   private JRadioButton booleanVector = new JRadioButton("vecteur Boolean");

    // JButtonGroup

    // some bouton group

   private ButtonGroup mainBG = new ButtonGroup();
   private ButtonGroup secondBG = new ButtonGroup();

   // ArrayList

   private ArrayList<JRadioButton> radioList = new ArrayList(){{
        add(lookup);
        add(insert);
        add(delete);
        add(union);
        add(intersection);
        add(difference);
    }};

    private ArrayList<JRadioButton> radioFunctionList = new ArrayList(){{
        add(sortedList);
        add(doubleList);
        add(simpleList);
        add(simpleVector);
        add(sortedVector);
        add(booleanVector);
    }};

    // Font

   Font font = new Font("ubuntu", Font.BOLD, 45);
   Font explicitFont = new Font("ubuntu", Font.BOLD, 15);
   Font stateFont = new Font("ubuntu", Font.BOLD, 25);
   Font textareaFont = new Font("ubuntu", Font.ITALIC, 19);


   public Fenetre(){

   }

/**
 * this is the main window with all its contains element
 */
public void montrer(){

        // window Params
        this.setTitle("TP 205");
        this.setSize(800, 800);
        this.setLocationRelativeTo(null);

        // bouton configuration

        bouton.setText("Simuler");
        bouton.addActionListener(new BtnClass());
        tpBouton.addActionListener(new BtnClass());
        tpBouton.setBackground(Color.BLACK);
        tpBouton.setFont(explicitFont);
        tpBouton.setForeground(Color.WHITE);


        // JLabel configuration

        explicitText.setText("Bienvenur sur notre tp de 205");
        label.setFont(font);
        explicitText.setFont(explicitFont);
        explicitText.setForeground(Color.WHITE);
        label.setForeground(Color.WHITE);
        state.setForeground(Color.WHITE);
        state.setFont(stateFont);
        initialState.setForeground(Color.WHITE);
        initialState.setFont(stateFont);
        finalState.setForeground(Color.WHITE);
        finalState.setFont(stateFont);

        // input configuration

        input.setFont(explicitFont);
        input.setPreferredSize(new Dimension(150, 30));
        input.setForeground(Color.BLACK);
        input.setMaximumSize(new Dimension(Integer.MAX_VALUE, input.getMinimumSize().height));
        output.setFont(textareaFont);
        output.setWrapStyleWord(true);
        output.setLineWrap(true);

        JScrollPane scrool = new JScrollPane();
        scrool.setBorder(BorderFactory.createTitledBorder("LIONEL"));
        scrool.setViewportView(output);

        // layout configuration

        JPanel b1 = new JPanel();
        b1.setLayout(new BoxLayout(b1, BoxLayout.LINE_AXIS));
        b1.add(label);

        JPanel b2 = new JPanel();
        b2.setLayout(new BoxLayout(b2, BoxLayout.LINE_AXIS));
        b2.add(explicitText);

        JPanel b3 = new JPanel();
        b3.setLayout(new BoxLayout(b3, BoxLayout.LINE_AXIS));
        b3.add(tpBouton);
        b3.add(bouton);

        JPanel b4 = new JPanel();
        b4.setLayout(new BoxLayout(b4, BoxLayout.LINE_AXIS));
        b4.add(state);

        JPanel b5 = new JPanel();
        b5.setLayout(new BoxLayout(b5, BoxLayout.LINE_AXIS));
        b5.add(finalState);

        JPanel b6 = new JPanel();
        b6.setLayout(new BoxLayout(b6, BoxLayout.LINE_AXIS));
        b6.add(initialState);

        b7.setLayout(new BoxLayout(b7, BoxLayout.LINE_AXIS));
        b7.add(tableShow);
        b7.add(input);
        b7.setVisible(false);

        this.setEventSimpleRadio();
        this.setEventSecondRadio();
        secondBGRadio.setVisible(false);
        mainBGRadio.setLayout(new BoxLayout(mainBGRadio, BoxLayout.LINE_AXIS));
        secondBGRadio.setLayout(new BoxLayout(secondBGRadio, BoxLayout.LINE_AXIS));
        container.setLayout(new BoxLayout(container, BoxLayout.PAGE_AXIS));
        main.setLayout(new GridLayout(2, 1));

        b1.setBackground(Color.ORANGE);
        b2.setBackground(Color.ORANGE);
        b3.setBackground(Color.ORANGE);
        b4.setBackground(Color.ORANGE);
        b5.setBackground(Color.ORANGE);
        b6.setBackground(Color.ORANGE);
        b7.setBackground(Color.ORANGE);


        mainBGRadio.setBackground(Color.ORANGE);
        secondBGRadio.setBackground(Color.ORANGE);

        container.add(b1);
        container.add(b2);
        container.add(mainBGRadio);
        container.add(secondBGRadio);
        container.add(b7);
        container.add(b6); 
        container.add(b4); 
        container.add(b5);

        container.add(b3);
        outPutField.add(output);
        outPutField.add(scrool);
        outPutField.setLayout(new GridLayout(0,1, 5, 5));
        container.setBackground(Color.ORANGE);
        main.add(container);
        main.add(outPutField);


        this.setContentPane(main);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setVisible(true);

这是它产生的屏幕截图：

我正在寻找如何解决这个问题并在文本区域溢出时正确显示滚动条并有一个小滚动条。

Answer 1

使用 JTextArea 的基本逻辑是：

//public static JTextArea output = new JTextArea("==== The Outputs HERE =====;
public static JTextArea output = new JTextArea(5, 30);

这将允许您创建一个包含 5 行数据和每行大约 30 个字符的文本区域。一旦你有超过 5 行的数据，滚动条就会出现。

然后在你的构造函数中你可以指定默认文本：

output = "========= The Outputs HERE ================================");

此外，您不应该在所有变量上使用 static 关键字。这表明您的班级设计不正确。阅读 How to Use Text Area 上的 Swing 教程中的部分，了解一个工作示例，该示例将向您展示如何更好地设计您的类。

保留所有 Swing 基础知识的教程链接。