由於掃描儀或while循環，JFrame沒有顯示？

我試圖用掃描儀讀取文件，我認爲我在下面寫的代碼是我需要的代碼，以做我想做的。由於掃描儀或while循環，JFrame沒有顯示？

該puprpose：我可以讀水平，然後我可以讀取邊緣（從kochfractal）和顏色。

當我試圖運行JFrame時，它運行但未顯示，當我註釋下面的代碼時顯示了該幀。

正在讀取的文件包含（int只發生在文件的頂部1次，然後是3 double和顏色不固定，它取決於int的數量，它們會多少次發生在文件中）

int 
double 
double 
double 
color 
double 
double 
double 
color 
double 
double 
double 
color 
double 
double 
double 
color

try { 
    Scanner fileScanner = new Scanner(new File(filepath+"wwob.txt")); 

    while(fileScanner.hasNextInt()){ 
     levelInFile = fileScanner.nextInt(); 
     lblLvl.setText("Level: "+levelInFile); 
    } 
    while(fileScanner.hasNextLine()){ 
    while(fileScanner.hasNextDouble()){ 
     str1 = str1+fileScanner.nextDouble()+"--"; 
     str2 = str2+fileScanner.nextDouble()+"--"; 
     str3 = str3+fileScanner.nextDouble()+"--"; 
     String color= fileScanner.next().toString(); 
    } 
    } 
    lblEdgesBottom.setText(str1); 
    lblEdgesLeft.setText(str2); 
    lblEdgesRight.setText(str3);

上請求的額外的代碼：

/* 
* To change this template, choose Tools | Templates 
* and open the template in the editor. 
*/ 

/* 
* KochPanel.java 
* 
* Created on 2-jul-2011, 10:08:42 
*/ 
package gui; 

import java.awt.Graphics; 
import java.io.File; 
import java.io.FileNotFoundException; 
import java.util.Scanner; 
import java.util.logging.Level; 
import java.util.logging.Logger; 
import timeutil.TimeStamp; 

/** 
* 
* @author Peter Boots 
*/ 
public class KochPanel extends javax.swing.JPanel{ 

    private timeutil.TimeStamp ts; 
    private static String filepath =File.separator+"media"+File.separator+"new_disk"+File.separator; 

    /** 
    * Creates new form KochPanel 
    */ 
    @SuppressWarnings("LeakingThisInConstructor") 
    public KochPanel() { 
     initComponents(); 
    } 

    public void changeLevel(int nxt) { 

      ts = new TimeStamp(); 
      ts.setBegin("Generate koch edges"); 

      int levelInFile=0; 
      String str1=""; 
      String str2=""; 
      String str3=""; 

      try { 
      Scanner fileScanner = new Scanner(new File(filepath+"wwob.txt")); 

      while(fileScanner.hasNextInt()){ 
       levelInFile = fileScanner.nextInt(); 
       lblLvl.setText("Level: "+levelInFile); 
      } 
      while(fileScanner.hasNextLine()){ 
      while(fileScanner.hasNextDouble()){ 
       str1 = str1+fileScanner.nextDouble()+"--"; 
       str2 = str2+fileScanner.nextDouble()+"--"; 
       str3 = str3+fileScanner.nextDouble()+"--"; 
       String color= fileScanner.next().toString(); 
      } 
      } 
      lblEdgesBottom.setText(str1); 
      lblEdgesLeft.setText(str2); 
      lblEdgesRight.setText(str3); 

      ts.setEnd("Einde koch edges"); 
      System.out.println(ts.toString()); 
     } catch (FileNotFoundException ex) { 
      Logger.getLogger(KochPanel.class.getName()).log(Level.SEVERE, null, ex); 
     } 
    } 

    /** 
    * 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() { 

     lblLvl = new javax.swing.JLabel(); 
     lblEdgesLeft = new javax.swing.JLabel(); 
     lblEdgesRight = new javax.swing.JLabel(); 
     lblEdgesBottom = new javax.swing.JLabel(); 

     setBackground(new java.awt.Color(0, 0, 0)); 
     setDoubleBuffered(false); 

     lblLvl.setForeground(new java.awt.Color(255, 0, 0)); 
     lblLvl.setText("jLabel1"); 

     lblEdgesLeft.setForeground(new java.awt.Color(255, 0, 0)); 
     lblEdgesLeft.setText("jLabel2"); 

     lblEdgesRight.setForeground(new java.awt.Color(255, 0, 0)); 
     lblEdgesRight.setText("jLabel3"); 

     lblEdgesBottom.setForeground(new java.awt.Color(255, 0, 0)); 
     lblEdgesBottom.setText("jLabel4"); 

     javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this); 
     this.setLayout(layout); 
     layout.setHorizontalGroup(
      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGroup(layout.createSequentialGroup() 
       .addContainerGap() 
       .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
        .addComponent(lblLvl) 
        .addComponent(lblEdgesLeft) 
        .addComponent(lblEdgesRight) 
        .addComponent(lblEdgesBottom)) 
       .addContainerGap(356, Short.MAX_VALUE)) 
     ); 
     layout.setVerticalGroup(
      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGroup(layout.createSequentialGroup() 
       .addContainerGap() 
       .addComponent(lblLvl) 
       .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
       .addComponent(lblEdgesLeft) 
       .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
       .addComponent(lblEdgesRight) 
       .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
       .addComponent(lblEdgesBottom) 
       .addContainerGap(211, Short.MAX_VALUE)) 
     ); 
    }// </editor-fold>       

    // Variables declaration - do not modify      
    private javax.swing.JLabel lblEdgesBottom; 
    private javax.swing.JLabel lblEdgesLeft; 
    private javax.swing.JLabel lblEdgesRight; 
    public javax.swing.JLabel lblLvl; 
    // End of variables declaration     


    @Override 
    public synchronized void paintComponent(Graphics g) { 
     ts = new TimeStamp(); 
     ts.setBegin("Begin paintComponent"); 
     super.paintComponent(g); 




     ts.setEnd(" Einde paintComponent"); 
     System.out.println(ts.toString()); 
     System.out.println("Aantal hoekpunten: "); 
//  lblLvl.setText("Number of edges: "); 
//  lblEdgesLeft.setText(ts.toString()); 
} 

}

與主CL的代碼屁股吧，這個類我shoudnt被編輯：

/* 
* To change this template, choose Tools | Templates 
* and open the template in the editor. 
*/ 

/* 
* KochFrame.java 
* 
* Created on 2-jul-2011, 10:00:05 
*/ 
package gui; 

import calculate.Edge; 


/** 
* 
* @author Peter Boots 
*/ 
public class KochFrame extends javax.swing.JFrame { 

    private static int zoomTranslateX = 0; 
    private static int zoomTranslateY = 0; 
    private static double zoom = 1; 
    private int lastDragX = 0; 
    private int lastDragY = 0; 
    private int level = 1; 

    /** Creates new form KochFrame */ 
    public KochFrame() { 
     initComponents(); 
     level = 1; 
     resetZoom(); 
     kochPanel.changeLevel(level); 
    } 

    /** 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() { 

     fitFractalBtn = new javax.swing.JButton(); 
     levelSpinner = new javax.swing.JSpinner(); 
     jLabel1 = new javax.swing.JLabel(); 
     kochPanel = new gui.KochPanel(); 

     setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); 
     setTitle("Koch Fractal"); 

     fitFractalBtn.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N 
     fitFractalBtn.setText("Fit Fractal"); 
     fitFractalBtn.addActionListener(new java.awt.event.ActionListener() { 
      public void actionPerformed(java.awt.event.ActionEvent evt) { 
       fitFractalBtnActionPerformed(evt); 
      } 
     }); 

     levelSpinner.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N 
     levelSpinner.setModel(new javax.swing.SpinnerNumberModel(Integer.valueOf(1), Integer.valueOf(1), null, Integer.valueOf(1))); 
     levelSpinner.addChangeListener(new javax.swing.event.ChangeListener() { 
      public void stateChanged(javax.swing.event.ChangeEvent evt) { 
       levelSpinnerStateChanged(evt); 
      } 
     }); 

     jLabel1.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N 
     jLabel1.setText("Level: "); 

     javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); 
     getContentPane().setLayout(layout); 
     layout.setHorizontalGroup(
      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGroup(layout.createSequentialGroup() 
       .addContainerGap() 
       .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false) 
         .addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup() 
          .addComponent(jLabel1) 
          .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
          .addComponent(levelSpinner)) 
         .addComponent(fitFractalBtn, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.PREFERRED_SIZE, 115, javax.swing.GroupLayout.PREFERRED_SIZE)) 
        .addComponent(kochPanel, javax.swing.GroupLayout.PREFERRED_SIZE, 419, javax.swing.GroupLayout.PREFERRED_SIZE)) 
       .addContainerGap(81, Short.MAX_VALUE)) 
     ); 
     layout.setVerticalGroup(
      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup() 
       .addContainerGap() 
       .addComponent(kochPanel, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
       .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 25, Short.MAX_VALUE) 
       .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
        .addComponent(levelSpinner, javax.swing.GroupLayout.PREFERRED_SIZE, 32, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addComponent(jLabel1)) 
       .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
       .addComponent(fitFractalBtn) 
       .addContainerGap()) 
     ); 

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

    private void fitFractalBtnActionPerformed(java.awt.event.ActionEvent evt) {            
     resetZoom(); 
     kochPanel.repaint(); 
    }            

private void levelSpinnerStateChanged(javax.swing.event.ChangeEvent evt) {           
    kochPanel.changeLevel((Integer) (levelSpinner.getValue())); 
}           

    private void kochPanelMouseClicked(java.awt.event.MouseEvent evt) {          
     double originalPointClickedX = (zoomTranslateX + evt.getX())/zoom; 
    double originalPointClickedY = (zoomTranslateY + evt.getY())/zoom; 

    if (evt.getButton() == java.awt.event.MouseEvent.BUTTON1) { 
     zoom *= 2; 
    } else if (evt.getButton() == java.awt.event.MouseEvent.BUTTON3) { 
     zoom /= 2; 
    } 
    zoomTranslateX = (int) (originalPointClickedX * zoom - evt.getX()); 
    zoomTranslateY = (int) (originalPointClickedY * zoom - evt.getY()); 
    kochPanel.repaint(); 
    }          

    private void kochPanelMouseDragged(java.awt.event.MouseEvent evt) {          
     zoomTranslateX = zoomTranslateX + lastDragX - evt.getX(); 
    zoomTranslateY = zoomTranslateY + lastDragY - evt.getY(); 
    lastDragX = evt.getX(); 
    lastDragY = evt.getY(); 
    kochPanel.repaint(); 
    }          

    private void kochPanelMousePressed(java.awt.event.MouseEvent evt) {          
     lastDragX = evt.getX(); 
    lastDragY = evt.getY(); 
    }          

    private void resetZoom() { 
     int kpWidth = kochPanel.getWidth(); 
     int kpHeight = kochPanel.getHeight(); 
     int kpSize = Math.min(kpWidth, kpHeight); 
     zoom = kpSize; 
     zoomTranslateX = -(kpWidth - kpSize)/2; 
     zoomTranslateY = -(kpHeight - kpSize)/2; 
    } 

    static public Edge edgeAfterZoomAndDrag(Edge e) { 
     return new Edge(
       e.X1 * zoom - zoomTranslateX, 
       e.Y1 * zoom - zoomTranslateY, 
       e.X2 * zoom - zoomTranslateX, 
       e.Y2 * zoom - zoomTranslateY, 
       e.color); 
    } 

    /** 
    * @param args the command line arguments 
    */ 
    public static void main(String args[]) { 
     java.awt.EventQueue.invokeLater(new Runnable() { 

      @Override 
      public void run() { 
       new KochFrame().setVisible(true); 
      } 
     }); 
    } 

    // Variables declaration - do not modify 
    private javax.swing.JButton fitFractalBtn; 
    private javax.swing.JLabel jLabel1; 
    private gui.KochPanel kochPanel; 
    private javax.swing.JSpinner levelSpinner; 
    // End of variables declaration 
}

來源

2013-11-27 cc2k

不要阻塞EDT（Event Dispatch Thread） - 當發生這種情況時GUI將「凍結」。而不是調用'Thread.sleep（n）'實現一個Swing'Timer'來重複執行任務，或者一個'SwingWorker'執行長時間運行的任務。有關更多詳細信息，請參見[Swing中的併發]（http://docs.oracle.com/javase/tutorial/uiswing/concurrency/）。 –

我用什麼叫sleep（）呢？ – cc2k

也感謝編輯，我不擅長編寫好的句子。 – cc2k

。在你的KochiPanel更新：

public void changeLevel(int nxt) { 

    ts = new TimeStamp(); 
    ts.setBegin("Generate koch edges"); 

    int levelInFile=0; 
    String str1=""; 
    String str2=""; 
    String str3=""; 

    try { 
     Scanner fileScanner = new Scanner(new File("c:/test.txt")); 

     //read line by line 
     int doubleNO=1; 
     while(fileScanner.hasNextLine()){ 
      String line = fileScanner.nextLine(); 


      //if its integer 
      try{ 
      int level = Integer.parseInt(line); 
      lblLvl.setText("Level: "+level); 
      continue; 
      }catch(NumberFormatException e){ 
       //ignore 
      } 

      try{ 
       double value = Double.parseDouble(line); 

       if(doubleNO==1){ 
        str1 = str1+value+"--";      
       }else if(doubleNO==2) { 
        str2 = str2+value+"--";      
       }else if (doubleNO==3){ 
        str3 = str3+value+"--";      
       } 
       doubleNO++; 
       continue; 
      }catch(NumberFormatException e){ 

       //reset 
       //its color here 
       System.out.println("Color " + line); 
       doubleNO=1; 
      } 
     } 

     lblEdgesBottom.setText(str1); 
     lblEdgesLeft.setText(str2); 
     lblEdgesRight.setText(str3); 

     ts.setEnd("Einde koch edges"); 
     System.out.println(ts.toString()); 
    } catch (FileNotFoundException ex) { 
     Logger.getLogger(KochPanel.class.getName()).log(Level.SEVERE, null, ex); 
    } 
}

這是基於對輸入文本文件：

1 
3.4 
4.5 
5.6 
color 
3.4 
4.5 
5.6 
color 
3.44 
4.55 
5.67 
color 
3.4 
4.5 
5.6 
color

輸出：

enter image description here

來源

2013-11-27 13:55:42 Makky

那裏有4個雙打，但增加了另一個if語句，但是不知何故他沒有看到任何價值部分。所以我做錯了什麼：S http://pastebin.com/9a4sv6dk – cc2k

讓我看看你的代碼。 – Makky

發佈您的txt文件。 – Makky

由於掃描儀或while循環，JFrame沒有顯示？

回答

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