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？

/*
 * 更改许可证头，选择项目属性中的许可证头。
 * 更改模板文件，选择工具|模板
 * 打开编辑器中的模板并打开模板
 */
package vista;

import java.awt.Image;
import javax.swing.ImageIcon;
import static paladins.nut.and.crush.panelver.PaladinsNutAndCrushPanelVer.mainPanel;

public class sceneKonami extends javax.swing.JPanel {

    String ruta = "src/backgrounds/soniabelmont.png";
    String ruta1 = "src/backgrounds/legends.png";
    ImageIcon fondo = new ImageIcon(new ImageIcon(ruta).getImage().getScaledInstance(1280, 720, Image.SCALE_DEFAULT));
    ImageIcon fondo1 = new ImageIcon(new ImageIcon(ruta1).getImage().getScaledInstance(730, 250, Image.SCALE_DEFAULT));

    public sceneKonami() {
        initComponents();
        loader();
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jButton1 = new javax.swing.JButton();
        texter = new javax.swing.JLabel();
        castlevania = new javax.swing.JLabel();
        background = new javax.swing.JLabel();

        setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout());

        jButton1.setText("jButton1");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });
        add(jButton1, new org.netbeans.lib.awtextra.AbsoluteConstraints(240, 370, -1, -1));
        add(texter, new org.netbeans.lib.awtextra.AbsoluteConstraints(184, 77, 1050, 510));
        add(castlevania, new org.netbeans.lib.awtextra.AbsoluteConstraints(50, 30, 730, 250));
        add(background, new org.netbeans.lib.awtextra.AbsoluteConstraints(0, 0, 1280, 720));
    }// </editor-fold>                        

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        String message = "Sonia Belmont is waiting, \nShe will appear soon. \nIn a great adventure";
        slowPrint(message);                                
    }                                        

    public static void slowPrint(String message) {
        char[] chars = message.toCharArray();
        for (int i = 0; i < chars.length; i++) {
            texter.setText(texter.getText() + String.valueOf(message.charAt(i)));
            mainPanel.repaint();
            mainPanel.revalidate();
            System.out.println(message.charAt(i));
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    // Variables declaration - do not modify                     
    private javax.swing.JLabel background;
    private javax.swing.JLabel castlevania;
    private javax.swing.JButton jButton1;
    private static javax.swing.JLabel texter;
    // End of variables declaration                   

    private void loader() {
        background.setIcon(fondo);
        castlevania.setIcon(fondo1);
    }
}

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?

/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package vista;
import java.awt.Image;
import javax.swing.ImageIcon;
import static paladins.nut.and.crush.panelver.PaladinsNutAndCrushPanelVer.mainPanel;
public class sceneKonami extends javax.swing.JPanel {
String ruta = &quot;src/backgrounds/soniabelmont.png&quot;;
String ruta1 = &quot;src/backgrounds/legends.png&quot;;
ImageIcon fondo = new ImageIcon(new ImageIcon(ruta).getImage().getScaledInstance(1280, 720, Image.SCALE_DEFAULT));
ImageIcon fondo1 = new ImageIcon(new ImageIcon(ruta1).getImage().getScaledInstance(730, 250, Image.SCALE_DEFAULT));
public sceneKonami() {
initComponents();
loader();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings(&quot;unchecked&quot;)
// &lt;editor-fold defaultstate=&quot;collapsed&quot; desc=&quot;Generated Code&quot;&gt;                          
private void initComponents() {
jButton1 = new javax.swing.JButton();
texter = new javax.swing.JLabel();
castlevania = new javax.swing.JLabel();
background = new javax.swing.JLabel();
setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout());
jButton1.setText(&quot;jButton1&quot;);
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
add(jButton1, new org.netbeans.lib.awtextra.AbsoluteConstraints(240, 370, -1, -1));
add(texter, new org.netbeans.lib.awtextra.AbsoluteConstraints(184, 77, 1050, 510));
add(castlevania, new org.netbeans.lib.awtextra.AbsoluteConstraints(50, 30, 730, 250));
add(background, new org.netbeans.lib.awtextra.AbsoluteConstraints(0, 0, 1280, 720));
}// &lt;/editor-fold&gt;                        
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
String message = &quot;Sonia Belmont is waiting, \nShe will appear soon. \nIn a great adventure&quot;;
slowPrint(message);
}                                        
public static void slowPrint(String message) {
char[] chars = message.toCharArray();
for (int i = 0; i &lt; chars.length; i++) {
texter.setText(texter.getText() + String.valueOf(message.charAt(i)));
mainPanel.repaint();
mainPanel.revalidate();
System.out.println(message.charAt(i));
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
// Variables declaration - do not modify                     
private javax.swing.JLabel background;
private javax.swing.JLabel castlevania;
private javax.swing.JButton jButton1;
private static javax.swing.JLabel texter;
// End of variables declaration                   
private void loader() {
background.setIcon(fondo);
castlevania.setIcon(fondo1);
}
}

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

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;：

```java
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
import javax.swing.JFrame;

public class SwingMain {

    SwingMain() {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocationRelativeTo(null);
        frame.add(new SceneKonami());
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        new SwingMain();
    }
}

class SceneKonami extends javax.swing.JPanel {

    private int index = 0;
    private javax.swing.Timer timer;
    private javax.swing.JButton jButton1;
    private javax.swing.JLabel texter;

    public SceneKonami() {
        initComponents();
    }

    private void initComponents() {

        jButton1 = new javax.swing.JButton();
        texter = new javax.swing.JLabel();
        setLayout(new BorderLayout(5, 5));
        jButton1.setText("Type Message");
        jButton1.addActionListener(evt -> jButton1ActionPerformed(evt));
        add(jButton1, BorderLayout.SOUTH);
        add(texter, BorderLayout.NORTH);
        setPreferredSize(new Dimension(400, 150));
    }

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
        String message = "Sonia Belmont is waiting, \nShe will appear soon. \nIn a great adventure";
        slowPrint(message);
    }

    public void slowPrint(String message) {

        if (timer != null && timer.isRunning()) return;
        index = 0;
        texter.setText("");

        timer = new javax.swing.Timer(100, new AbstractAction() {
            @Override
            public void actionPerformed(ActionEvent e) {
                texter.setText(texter.getText() + String.valueOf(message.charAt(index)));
                index++;
                if (index >= message.length()) {
                    timer.stop();
                }
            }
        });
        timer.start();
    }
}

<hr>
(1) 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 (1) of what you are trying to achieve, using a swing Timer:

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
import javax.swing.JFrame;
public class SwingMain {
SwingMain() {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.add(new SceneKonami());
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
new SwingMain();
}
}
class SceneKonami extends javax.swing.JPanel {
private int index = 0;
private javax.swing.Timer timer;
private javax.swing.JButton jButton1;
private javax.swing.JLabel texter;
public SceneKonami() {
initComponents();
}
private void initComponents() {
jButton1 = new javax.swing.JButton();
texter = new javax.swing.JLabel();
setLayout(new BorderLayout(5,5));
jButton1.setText(&quot;Type Message&quot;);
jButton1.addActionListener(evt -&gt; jButton1ActionPerformed(evt));
add(jButton1, BorderLayout.SOUTH);
add(texter, BorderLayout.NORTH);
setPreferredSize(new Dimension(400,150));
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
String message = &quot;Sonia Belmont is waiting, \nShe will appear soon. \nIn a great adventure&quot;;
slowPrint(message);
}
public void slowPrint(String message) {
if(timer != null &amp;&amp; timer.isRunning()) return;
index   = 0;
texter.setText(&quot;&quot;);
timer = new javax.swing.Timer(100,new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
texter.setText(texter.getText() + String.valueOf(message.charAt(index)));
index++;
if (index &gt;= message.length()) {
timer.stop();
}
}
});
timer.start();
}
}

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

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在一个JLabel中实现打字机效果。

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