在一个JLabel中实现打字机效果。

huangapple
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英文:

Make a typewriter effect in a jlabel

问题

这是我的JPanel，我将其添加到JFrame中，但是写入每个字母的代码在执行时会冻结，过了一段时间后文本才会出现，文本没有以那种效果进行书写，但我认为它应该能正常工作，为什么？

  1. /*
  2.  * 更改许可证头，选择项目属性中的许可证头。
  3.  * 更改模板文件，选择工具|模板
  4.  * 打开编辑器中的模板并打开模板
  5.  */
  6. package vista;
  8. import java.awt.Image;
  9. import javax.swing.ImageIcon;
  10. import static paladins.nut.and.crush.panelver.PaladinsNutAndCrushPanelVer.mainPanel;
  12. public class sceneKonami extends javax.swing.JPanel {
  14.     String ruta = "src/backgrounds/soniabelmont.png";
  15.     String ruta1 = "src/backgrounds/legends.png";
  16.     ImageIcon fondo = new ImageIcon(new ImageIcon(ruta).getImage().getScaledInstance(1280, 720, Image.SCALE_DEFAULT));
  17.     ImageIcon fondo1 = new ImageIcon(new ImageIcon(ruta1).getImage().getScaledInstance(730, 250, Image.SCALE_DEFAULT));
  19.     public sceneKonami() {
  20.         initComponents();
  21.         loader();
  22.     }
  24.     /**
  25.      * This method is called from within the constructor to initialize the form.
  26.      * WARNING: Do NOT modify this code. The content of this method is always
  27.      * regenerated by the Form Editor.
  28.      */
  29.     @SuppressWarnings("unchecked")
  30.     // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
  31.     private void initComponents() {
  33.         jButton1 = new javax.swing.JButton();
  34.         texter = new javax.swing.JLabel();
  35.         castlevania = new javax.swing.JLabel();
  36.         background = new javax.swing.JLabel();
  38.         setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout());
  40.         jButton1.setText("jButton1");
  41.         jButton1.addActionListener(new java.awt.event.ActionListener() {
  42.             public void actionPerformed(java.awt.event.ActionEvent evt) {
  43.                 jButton1ActionPerformed(evt);
  44.             }
  45.         });
  46.         add(jButton1, new org.netbeans.lib.awtextra.AbsoluteConstraints(240, 370, -1, -1));
  47.         add(texter, new org.netbeans.lib.awtextra.AbsoluteConstraints(184, 77, 1050, 510));
  48.         add(castlevania, new org.netbeans.lib.awtextra.AbsoluteConstraints(50, 30, 730, 250));
  49.         add(background, new org.netbeans.lib.awtextra.AbsoluteConstraints(0, 0, 1280, 720));
  50.     }// </editor-fold>                        
  52.     private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
  53.         String message = "Sonia Belmont is waiting, \nShe will appear soon. \nIn a great adventure";
  54.         slowPrint(message);                                
  55.     }                                        
  57.     public static void slowPrint(String message) {
  58.         char[] chars = message.toCharArray();
  59.         for (int i = 0; i < chars.length; i++) {
  60.             texter.setText(texter.getText() + String.valueOf(message.charAt(i)));
  61.             mainPanel.repaint();
  62.             mainPanel.revalidate();
  63.             System.out.println(message.charAt(i));
  64.             try {
  65.                 Thread.sleep(100);
  66.             } catch (InterruptedException e) {
  67.                 e.printStackTrace();
  68.             }
  69.         }
  70.     }
  72.     // Variables declaration - do not modify                     
  73.     private javax.swing.JLabel background;
  74.     private javax.swing.JLabel castlevania;
  75.     private javax.swing.JButton jButton1;
  76.     private static javax.swing.JLabel texter;
  77.     // End of variables declaration                   
  79.     private void loader() {
  80.         background.setIcon(fondo);
  81.         castlevania.setIcon(fondo1);
  82.     }
  83. }

当程序运行并且我按下按钮来运行打字机效果时，程序会冻结，过了一段时间后文本才会出现。

英文:

This is my JPanel which I'm adding in a JFrame, but the code that write letter per letter but when executed freezes and sometime later, the text appears, the text is not writing with that effect, but I think it should be working, why?

  1. /*
  2. * To change this license header, choose License Headers in Project Properties.
  3. * To change this template file, choose Tools | Templates
  4. * and open the template in the editor.
  5. */
  6. package vista;
  7. import java.awt.Image;
  8. import javax.swing.ImageIcon;
  9. import static paladins.nut.and.crush.panelver.PaladinsNutAndCrushPanelVer.mainPanel;
  10. public class sceneKonami extends javax.swing.JPanel {
  11. String ruta = &quot;src/backgrounds/soniabelmont.png&quot;;
  12. String ruta1 = &quot;src/backgrounds/legends.png&quot;;
  13. ImageIcon fondo = new ImageIcon(new ImageIcon(ruta).getImage().getScaledInstance(1280, 720, Image.SCALE_DEFAULT));
  14. ImageIcon fondo1 = new ImageIcon(new ImageIcon(ruta1).getImage().getScaledInstance(730, 250, Image.SCALE_DEFAULT));
  15. public sceneKonami() {
  16. initComponents();
  17. loader();
  18. }
  19. /**
  20. * This method is called from within the constructor to initialize the form.
  21. * WARNING: Do NOT modify this code. The content of this method is always
  22. * regenerated by the Form Editor.
  23. */
  24. @SuppressWarnings(&quot;unchecked&quot;)
  25. // &lt;editor-fold defaultstate=&quot;collapsed&quot; desc=&quot;Generated Code&quot;&gt;                          
  26. private void initComponents() {
  27. jButton1 = new javax.swing.JButton();
  28. texter = new javax.swing.JLabel();
  29. castlevania = new javax.swing.JLabel();
  30. background = new javax.swing.JLabel();
  31. setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout());
  32. jButton1.setText(&quot;jButton1&quot;);
  33. jButton1.addActionListener(new java.awt.event.ActionListener() {
  34. public void actionPerformed(java.awt.event.ActionEvent evt) {
  35. jButton1ActionPerformed(evt);
  36. }
  37. });
  38. add(jButton1, new org.netbeans.lib.awtextra.AbsoluteConstraints(240, 370, -1, -1));
  39. add(texter, new org.netbeans.lib.awtextra.AbsoluteConstraints(184, 77, 1050, 510));
  40. add(castlevania, new org.netbeans.lib.awtextra.AbsoluteConstraints(50, 30, 730, 250));
  41. add(background, new org.netbeans.lib.awtextra.AbsoluteConstraints(0, 0, 1280, 720));
  42. }// &lt;/editor-fold&gt;                        
  43. private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
  44. String message = &quot;Sonia Belmont is waiting, \nShe will appear soon. \nIn a great adventure&quot;;
  45. slowPrint(message);
  46. }                                        
  47. public static void slowPrint(String message) {
  48. char[] chars = message.toCharArray();
  49. for (int i = 0; i &lt; chars.length; i++) {
  50. texter.setText(texter.getText() + String.valueOf(message.charAt(i)));
  51. mainPanel.repaint();
  52. mainPanel.revalidate();
  53. System.out.println(message.charAt(i));
  54. try {
  55. Thread.sleep(100);
  56. } catch (InterruptedException e) {
  57. e.printStackTrace();
  58. }
  59. }
  60. }
  61. // Variables declaration - do not modify                     
  62. private javax.swing.JLabel background;
  63. private javax.swing.JLabel castlevania;
  64. private javax.swing.JButton jButton1;
  65. private static javax.swing.JLabel texter;
  66. // End of variables declaration                   
  67. private void loader() {
  68. background.setIcon(fondo);
  69. castlevania.setIcon(fondo1);
  70. }
  71. }

when the program run and i press the buttom to run the type writter eefect, the program got freeze and sometime later the text appears

答案1

得分: 0

  1. 以下是您尝试使用 Swing `Timer` 实现的 [mre](https://stackoverflow.com/help/minimal-reproducible-example) &lt;sup&gt;(1)&lt;/sup&gt;：
  3. ```java
  4. import java.awt.BorderLayout;
  5. import java.awt.Dimension;
  6. import java.awt.event.ActionEvent;
  7. import javax.swing.AbstractAction;
  8. import javax.swing.JFrame;
  10. public class SwingMain {
  12.     SwingMain() {
  13.         JFrame frame = new JFrame();
  14.         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  15.         frame.setLocationRelativeTo(null);
  16.         frame.add(new SceneKonami());
  17.         frame.pack();
  18.         frame.setVisible(true);
  19.     }
  21.     public static void main(String[] args) {
  22.         new SwingMain();
  23.     }
  24. }
  26. class SceneKonami extends javax.swing.JPanel {
  28.     private int index = 0;
  29.     private javax.swing.Timer timer;
  30.     private javax.swing.JButton jButton1;
  31.     private javax.swing.JLabel texter;
  33.     public SceneKonami() {
  34.         initComponents();
  35.     }
  37.     private void initComponents() {
  39.         jButton1 = new javax.swing.JButton();
  40.         texter = new javax.swing.JLabel();
  41.         setLayout(new BorderLayout(5, 5));
  42.         jButton1.setText("Type Message");
  43.         jButton1.addActionListener(evt -> jButton1ActionPerformed(evt));
  44.         add(jButton1, BorderLayout.SOUTH);
  45.         add(texter, BorderLayout.NORTH);
  46.         setPreferredSize(new Dimension(400, 150));
  47.     }
  49.     private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
  50.         String message = "Sonia Belmont is waiting, \nShe will appear soon. \nIn a great adventure";
  51.         slowPrint(message);
  52.     }
  54.     public void slowPrint(String message) {
  56.         if (timer != null && timer.isRunning()) return;
  57.         index = 0;
  58.         texter.setText("");
  60.         timer = new javax.swing.Timer(100, new AbstractAction() {
  61.             @Override
  62.             public void actionPerformed(ActionEvent e) {
  63.                 texter.setText(texter.getText() + String.valueOf(message.charAt(index)));
  64.                 index++;
  65.                 if (index >= message.length()) {
  66.                     timer.stop();
  67.                 }
  68.             }
  69.         });
  70.         timer.start();
  71.     }
  72. }

<hr>
<sup>(1)</sup> 在提问和回答时，始终考虑发布一个最小可复现示例（MRE）。

英文:

The following is mre <sup>(1)</sup> of what you are trying to achieve, using a swing Timer:

  1. import java.awt.BorderLayout;
  2. import java.awt.Dimension;
  3. import java.awt.event.ActionEvent;
  4. import javax.swing.AbstractAction;
  5. import javax.swing.JFrame;
  6. public class SwingMain {
  7. SwingMain() {
  8. JFrame frame = new JFrame();
  9. frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  10. frame.setLocationRelativeTo(null);
  11. frame.add(new SceneKonami());
  12. frame.pack();
  13. frame.setVisible(true);
  14. }
  15. public static void main(String[] args) {
  16. new SwingMain();
  17. }
  18. }
  19. class SceneKonami extends javax.swing.JPanel {
  20. private int index = 0;
  21. private javax.swing.Timer timer;
  22. private javax.swing.JButton jButton1;
  23. private javax.swing.JLabel texter;
  24. public SceneKonami() {
  25. initComponents();
  26. }
  27. private void initComponents() {
  28. jButton1 = new javax.swing.JButton();
  29. texter = new javax.swing.JLabel();
  30. setLayout(new BorderLayout(5,5));
  31. jButton1.setText(&quot;Type Message&quot;);
  32. jButton1.addActionListener(evt -&gt; jButton1ActionPerformed(evt));
  33. add(jButton1, BorderLayout.SOUTH);
  34. add(texter, BorderLayout.NORTH);
  35. setPreferredSize(new Dimension(400,150));
  36. }
  37. private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
  38. String message = &quot;Sonia Belmont is waiting, \nShe will appear soon. \nIn a great adventure&quot;;
  39. slowPrint(message);
  40. }
  41. public void slowPrint(String message) {
  42. if(timer != null &amp;&amp; timer.isRunning()) return;
  43. index   = 0;
  44. texter.setText(&quot;&quot;);
  45. timer = new javax.swing.Timer(100,new AbstractAction() {
  46. @Override
  47. public void actionPerformed(ActionEvent e) {
  48. texter.setText(texter.getText() + String.valueOf(message.charAt(index)));
  49. index++;
  50. if (index &gt;= message.length()) {
  51. timer.stop();
  52. }
  53. }
  54. });
  55. timer.start();
  56. }
  57. }

<hr>
<sup>(1)</sup> Always consider posting an MRE when asking and answering.

huangapple
  • 本文由 发表于 2020年8月19日 02:27:57
  • 转载请务必保留本文链接：https://go.coder-hub.com/63474574.html
  • event-dispatch-thread
  • java
  • jlabel
  • swing
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