半秒鍾后更新JLabel中包含的圖片

Question

我想創建一個狼奔跑的簡單動畫。 為此，我有9 png的狼的奔跑動作。 當按下start_button時，它將顯示屏幕的所有擺動元素。 然后，當按下wolf_run按鈕時，我希望JLabel wolf將其圖標更改為“ wolf2.png”，“ wolf3.png”，wolf4.png“，直至” wolf9.png“，然后再返回至” wolf1.png“ 。它們之間的間隔為0.5秒。wait（）函數和其他所有功能都可以正常工作，只是更改JLabel中的圖像。我嘗試了很多方法，但似乎無濟於事。如果我在沒有wait（）的情況下手動進行操作）函數，然后它可以工作，但是我需要JLabel在程序運行時同時進行更改。請在執行過程中幫助我更改圖像。謝謝

PS：我已經使用JFrame表單來設計和實現程序中的GUI

import java.util.Calendar;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JLabel;
import java.awt.*;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class page2 extends javax.swing.JFrame {
static int i =2;

public page2() {
  initComponents();
  text_field.setVisible(false);
  wolf.setVisible(false);
  wolf_run.setVisible(false);
  jPanel.setVisible(false);
  jPanel.setOpaque(false);

}

public void wait(int a){
long b = (long)a;
Calendar za = Calendar.getInstance();
long t1 = za.getTimeInMillis();
  while (true) {
     Calendar zb = Calendar.getInstance();
long t2 = zb.getTimeInMillis();
if((t2==(t1+b))||(t2==(t1+b-1))||(t2==(t1+a+1))){
break;
}
}
}

private void initComponents() {

    start_button = new javax.swing.JButton();
    text_field = new javax.swing.JTextField();
    wolf_run = new javax.swing.JButton();
    jPanel = new javax.swing.JPanel();
    wolf = new javax.swing.JLabel();
    background2 = new javax.swing.JLabel();
    jPanel1 = new javax.swing.JPanel();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
    setMinimumSize(new java.awt.Dimension(849, 499));
    setSize(new java.awt.Dimension(850, 500));
    getContentPane().setLayout(null);

    start_button.setIcon(new javax.swing.ImageIcon(getClass().getResource("/button_start.png"))); // NOI18N
    start_button.setToolTipText("click this button to start");
    start_button.setBorder(null);
    start_button.setCursor(new java.awt.Cursor(java.awt.Cursor.HAND_CURSOR));
    start_button.setName("");
    start_button.setPressedIcon(new javax.swing.ImageIcon(getClass().getResource("/button_start_go.png"))); // NOI18N
    start_button.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            start_buttonActionPerformed(evt);
        }
    });
    getContentPane().add(start_button);
    start_button.setBounds(290, 80, 310, 310);

    text_field.setFont(new java.awt.Font("Lucida Grande", 0, 22)); // NOI18N
    text_field.setHorizontalAlignment(javax.swing.JTextField.CENTER);
    text_field.setToolTipText("Type here");
    text_field.setFocusCycleRoot(true);
    getContentPane().add(text_field);
    text_field.setBounds(370, 390, 450, 60);

    wolf_run.setBorder(javax.swing.BorderFactory.createBevelBorder(javax.swing.border.BevelBorder.RAISED));
    wolf_run.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            wolf_runActionPerformed(evt);
        }
    });
    getContentPane().add(wolf_run);
    wolf_run.setBounds(630, 120, 190, 140);

    wolf.setIcon(new javax.swing.ImageIcon(getClass().getResource("/wolf1.png"))); // NOI18N
    jPanel.add(wolf);

    getContentPane().add(jPanel);
    jPanel.setBounds(20, 320, 330, 150);

    background2.setIcon(new javax.swing.ImageIcon(getClass().getResource("/backgroung2.png"))); // NOI18N
    getContentPane().add(background2);
    background2.setBounds(0, 0, 850, 500);
    getContentPane().add(jPanel1);
    jPanel1.setBounds(10, 320, 310, 160);

    pack();
}// </editor-fold>

private void start_buttonActionPerformed(java.awt.event.ActionEvent evt) {                                             
Calendar za = Calendar.getInstance();
  int m1 = za.get(Calendar.MINUTE);
  int s1 = za.get(Calendar.SECOND);
  while (true) {
     Calendar zb = Calendar.getInstance();
     int m2 = zb.get(Calendar.MINUTE);
     int s2 = zb.get(Calendar.SECOND);
     if (m2 != m1) {
        s2 = s2 + 60;
     }
     if (s2 == s1 + 1) {
        start_button.setVisible(false);
        start_button.setEnabled(false);
        text_field.setVisible(true);
        wolf.setVisible(true);
        wolf_run.setVisible(true);
        jPanel.setVisible(true);
        break;
     }
  }
  }                                            

private void wolf_runActionPerformed(java.awt.event.ActionEvent evt) {                                         
while(true){
wait(500);
        wolf.setIcon(new javax.swing.ImageIcon(getClass().getResource("/wolf"+i+".png")));
 System.out.println("processing "+i);
i=i+1;
if(i>9)
{   i=1;}
}
}                                        

public static void main(String args[]) {
  try {
     for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
        if ("Nimbus".equals(info.getName())) {
           javax.swing.UIManager.setLookAndFeel(info.getClassName());
           break;
        }
     }
  } catch (ClassNotFoundException ex) {
     java.util.logging.Logger.getLogger(page2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
  } catch (InstantiationException ex) {
     java.util.logging.Logger.getLogger(page2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
  } catch (IllegalAccessException ex) {
     java.util.logging.Logger.getLogger(page2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
  } catch (javax.swing.UnsupportedLookAndFeelException ex) {
     java.util.logging.Logger.getLogger(page2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
  }

  java.awt.EventQueue.invokeLater(new Runnable() {

     public void run() {
        new page2().setVisible(true);
     }
  });


}

private javax.swing.JLabel background2;
private javax.swing.JPanel jPanel;
private javax.swing.JPanel jPanel1;
private javax.swing.JButton start_button;
private javax.swing.JTextField text_field;
private static javax.swing.JLabel wolf;
private javax.swing.JButton wolf_run;

}

Answer 1

使用javax.swingTimer 。 Swing事件線程中的Waitnig導致GUI凍結

Answer 2

使用javax.swing.Timer 。

有關更多信息和示例，請參見Java教程如何使用Swing計時器和課程：Swing中的並發 。