Question

我试图让“生成”JButton每次按下时在文本区域中放置一个新单词。我试过循环，这导致我的GUI停止响应。

示例用户输入：点击“生成”按钮3次文本区域中的示例输出：applepotatocucumber

有什么建议吗？

以下是代码：

 public Generator(){
    String[] words = {apple, pear, cucumber, lettuce, tomato, potato};
    String random = (words[new Random().nextInt(words.length)]);

            setBackground(Color.CYAN);
            setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            setBounds(100, 100, 450, 300);
            contentPane = new JPanel();
            contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
            setContentPane(contentPane);
            SpringLayout sl_contentPane = new SpringLayout();
            contentPane.setLayout(sl_contentPane);

            JLabel lblNewLabel = new JLabel("Random Word Generator");
            sl_contentPane.putConstraint(SpringLayout.NORTH, lblNewLabel, 10,     SpringLayout.NORTH, contentPane);
            sl_contentPane.putConstraint(SpringLayout.WEST, lblNewLabel, 27, SpringLayout.WEST, contentPane);
            lblNewLabel.setFont(new Font("Tahoma", Font.PLAIN, 21));
            lblNewLabel.setHorizontalAlignment(SwingConstants.CENTER);
            contentPane.add(lblNewLabel);


            JLabel lblInfo = new JLabel("Result will be printed in the white space.");
            sl_contentPane.putConstraint(SpringLayout.NORTH, lblResultsWillBe, 73, SpringLayout.NORTH, contentPane);
            sl_contentPane.putConstraint(SpringLayout.WEST, lblResultsWillBe, 124, SpringLayout.WEST, contentPane);
            lblResultsWillBe.setHorizontalAlignment(SwingConstants.CENTER);
            contentPane.add(lblInfo);

            JTextArea textArea = new JTextArea();
            textArea.setWrapStyleWord(true);
            sl_contentPane.putConstraint(SpringLayout.NORTH, textArea, 150, SpringLayout.NORTH, contentPane);
            sl_contentPane.putConstraint(SpringLayout.WEST, textArea, 141, SpringLayout.WEST, contentPane);
            sl_contentPane.putConstraint(SpringLayout.SOUTH, textArea, 12, SpringLayout.SOUTH, contentPane);
            sl_contentPane.putConstraint(SpringLayout.EAST, textArea, -124, SpringLayout.EAST, contentPane);
            contentPane.add(textArea);

            JButton btnGenerate = new JButton("Generate");
            sl_contentPane.putConstraint(SpringLayout.NORTH, btnGenerate, 41, SpringLayout.NORTH, contentPane);
            sl_contentPane.putConstraint(SpringLayout.WEST, btnGenerate, 163, SpringLayout.WEST, contentPane);
            contentPane.add(btnGenerate);
            btnGenerate.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e) {
                textArea.setText(random);
                Object source = e.getSource();
                if (source == btnGenerate){
                        textArea.setText(random);
                }

            }});
            JLabel txtResults = new JLabel();
            sl_contentPane.putConstraint(SpringLayout.SOUTH, txtResults, -100, 

    SpringLayout.SOUTH, contentPane);
                sl_contentPane.putConstraint(SpringLayout.EAST, txtResults, -143, SpringLayout.EAST, contentPane);
            contentPane.add(txtResults);

        }

Answer 1

文本区域中的示例输出：applepotatocucumber

请勿使用setText()方法。这取代了现有的文本。

改为使用：

textArea.append(random);

因此，每次单击该按钮时，新文本都将附加到文本区域。

如何再次点击JButton重复其动作？

1 个答案: