如何從外部類追加JTextArea？

Question

我有3個類，一個Frame類，一個Panel類和一個Algorithm類。框架首先被創建並且包含面板類，面板然後按下按鈕來啓動算法。該面板有一個JTextArea日誌，該算法必須附加。我嘗試通過面板，以便它可以訪問它，但沒有運氣。試圖通過JTextArea本身，也沒有運氣。即使寫了一個函數，算法可以調用它來追加，仍然沒有。這裏的抓點在哪裏？

代碼如下，希望它不是太多： P.S.該代碼包含一個FileLoader類，但只是加載一個文件。

框架：

import java.awt.BorderLayout; 


    import java.util.LinkedList; 
    import javax.swing.BorderFactory; 
    import javax.swing.JFrame; 
    import javax.swing.JLabel; 
    import javax.swing.JPanel; 
    import javax.swing.JTabbedPane; 
    import javax.swing.border.EtchedBorder; 

@SuppressWarnings("serial") 
public class ClusteringSelection extends JFrame implements Runnable{ 

    LinkedList<Record> table; 
    KMeansUI kMeansUI; 

public void run() 
{ 
    StartUI(); 
} 

public void StartUI() 
{ 
    JTabbedPane tab1=new JTabbedPane(); 

    tab1.addTab("K-Means", kMeansUI=new KMeansUI(this)); 
    tab1.addTab("Aglomerative", new JPanel()); 
    add(tab1); 
    JLabel status=new JLabel(); 
    status.setBorder(BorderFactory.createEtchedBorder(EtchedBorder.RAISED)); 
    add(status, BorderLayout.SOUTH); 
    setSize(320,320); 
    setResizable(false); 
    setDefaultCloseOperation(EXIT_ON_CLOSE); 
    setVisible(true); 
    setLocationRelativeTo(null); 
} 

@SuppressWarnings("unused") 
ClusteringSelection() 
{ 
    FileLoader loader=new FileLoader(this); 
} 

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

} 
} 

面板：

import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import javax.swing.BorderFactory; 
import javax.swing.ButtonGroup; 
import javax.swing.GroupLayout; 
import javax.swing.JButton; 
import javax.swing.JLabel; 
import javax.swing.JPanel; 
import javax.swing.JRadioButton; 
import javax.swing.JScrollPane; 
import javax.swing.JTextArea; 
import javax.swing.JTextField; 
import javax.swing.border.EtchedBorder; 

@SuppressWarnings("serial") 
public class KMeansUI extends JPanel implements Runnable{ 

    ClusteringSelection mainWindow; 
    JTextArea log; 
    KMeans kMeans; 
    JTextField centroids; 

    public void UpdateLog(String text) 
    { 
     log.append(text+"\n"); 
    } 

    public void run() 
    { 
     kMeans=new KMeans(mainWindow.table, Integer.parseInt(centroids.getText()), KMeansUI.this); 
    } 

    public void StartUI() 
    { 
     centroids=new JTextField(); 
     log=new JTextArea(" "); 

     log.setBorder(BorderFactory.createEtchedBorder(EtchedBorder.RAISED)); 

     JScrollPane logScrool=new JScrollPane(); 
     logScrool.add(log); 
     logScrool.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS); 

     JButton start=new JButton("Start"); 

     start.addActionListener(new ActionListener() 
     { 
      public void actionPerformed(ActionEvent e) 
      { 
       run(); 
       //kMeans=new KMeans(mainWindow.table, Integer.parseInt(centroids.getText()), KMeansUI.this); 
      } 
     }); 

    JLabel cenLabel=new JLabel("Count:"); 
    JRadioButton euclede=new JRadioButton("Eucledean"); 
    JRadioButton manhattan=new JRadioButton("Manhattan"); 
    JRadioButton pearsons=new JRadioButton("Pearson's"); 

    ButtonGroup messure=new ButtonGroup(); 
    messure.add(euclede); 
    messure.add(manhattan); 
    messure.add(pearsons); 

    GroupLayout layout=new GroupLayout(this); 
    setLayout(layout); 

    layout.setAutoCreateGaps(true); 
    layout.setAutoCreateContainerGaps(true); 

    layout.setHorizontalGroup(layout.createSequentialGroup() 
       .addGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING) 
         .addGroup(layout.createSequentialGroup() 
           .addComponent(cenLabel) 
           .addComponent(centroids,20,20,20)) 
           .addGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING) 
             .addComponent(euclede)) 
             .addComponent(manhattan) 
             .addComponent(pearsons) 
             .addComponent(start)) 
       .addComponent(logScrool) 

      ); 

    layout.setVerticalGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING) 
       .addGroup(layout.createSequentialGroup() 
         .addGroup(layout.createParallelGroup(GroupLayout.Alignment.BASELINE) 
           .addComponent(cenLabel) 
           .addComponent(centroids,20,20,20) 
           ) 
         .addGroup(layout.createParallelGroup(GroupLayout.Alignment.CENTER) 
           .addGroup(layout.createSequentialGroup() 
             .addComponent(euclede) 
             .addComponent(manhattan) 
             .addComponent(pearsons) 
             .addComponent(start)))) 
       .addComponent(logScrool)); 

    setVisible(true); 
} 
KMeansUI(ClusteringSelection mainWindow) 
{ 
    this.mainWindow=mainWindow; 
    StartUI(); 
} 
} 

的算法，它工作正常，但不追加。

import java.util.LinkedList; 

public class KMeans implements Runnable{ 

    LinkedList<Record> table; 
    LinkedList<Centroid> centroidList; 
boolean clusterStop=false; 
int precision=10000000; 
int centroidCount; 
double time, iterCount=0; 
KMeansUI kMeansUI; 

public void run() 
{ 
    while(clusterStop==false) 
    { 
     UpdateRecords(centroidList); 
     UpdateClusters(); 
     iterCount++; 

     for(int i=0;i<centroidCount;i++) 
     { 
      int count=0; 
      for(int j=0;j<table.size();j++) 
      { 
       if(table.get(j).type==i) 
       { 
        count++; 
       } 
      } 
      System.out.println("Cluster "+(i+1)+" has "+count+" records."); 
      //log.append("Cluster "+(i+1)+" has "+count+" records."); 
      kMeansUI.UpdateLog("Cluster "+(i+1)+" has "+count+" records."); 
     } 
    } 
    Output(); 
} 

KMeans(LinkedList<Record> table, int centroidCount, KMeansUI kMeansUI) 
{ 
    this.kMeansUI=kMeansUI; 
    time=System.currentTimeMillis(); 
    this.table=table; 
    this.centroidCount=centroidCount; 
    CreateCentroids(); 
    run(); 
} 

public void UpdateClusters() 
{ 
    clusterStop=true; 
    for(int i=0;i<centroidList.size();i++) //staiga pa centroidiem 
    { 
     for(int j=0;j<table.get(0).values.size();j++) //staiga pa kolonnam 
     { 
      double sum=0; 
      double count=0; 
      for(int k=0;k<table.size();k++) //staiga pa rindam 
      { 
       if(centroidList.get(i).type==table.get(k).type) 
       { 
        sum+=table.get(k).values.get(j); 
        count++; 
       } 

      } 
      if(centroidList.get(i).dimVal.get(j)!=(double) Math.round(((1/count)*sum)*precision)/precision) 
      { 
       clusterStop=false; 
      } 
      centroidList.get(i).dimVal.set(j, (double) Math.round(((1/count)*sum)*precision)/precision); 

     } 

    } 
} 

public void UpdateRecords(LinkedList<Centroid> centroidList) 
{ 
    for(int i=0;i<table.size();i++) 
    { 
     table.get(i).Update(centroidList); 
    } 
} 

public void CreateCentroids() 
{ 
    centroidList=new LinkedList<Centroid>(); 
    for(int i=0;i<centroidCount;i++) 
    { 
     centroidList.add(new Centroid(table.get(0).values.size(),i)); 
    } 
} 

public void Output() 
{ 
    LinkedList<String> types=new LinkedList<String>(); 
    for(int i=0;i<table.size();i++) 
    { 
     if(!types.contains(table.get(i).realType)) 
     { 
      types.add(table.get(i).realType); 
     } 
    }  
    for(int i=0;i<centroidCount;i++) //staiga pa centroidiem 
    {  
     for(int j=0;j<types.size();j++) //staiga pa klasem 
     { 
      int count=0; 
      for(int k=0;k<table.size();k++) // staiga pa rindam 
      { 
       if(table.get(k).type==i && table.get(k).realType.equals(types.get(j))) 
       { 
         count++;  
       } 
      } 
      System.out.println("Centroid "+(i+1)+" has "+count+" of type "+types.get(j)); 
      //log.append("Centroid "+(i+1)+" has "+count+" of type "+types.get(j)); 
      kMeansUI.UpdateLog("Centroid "+(i+1)+" has "+count+" of type "+types.get(j)); 
     } 
    } 

    for(int i=0;i<centroidCount;i++) 
    { 
     int count=0; 
     for(int j=0;j<table.size();j++) 
     { 
      if(table.get(j).type==i) 
      { 
       count++; 
      } 
     } 
     System.out.println("Cluster "+i+" has "+count+" records."); 
     //log.append("Cluster "+i+" has "+count+" records."); 
     kMeansUI.UpdateLog("Cluster "+i+" has "+count+" records."); 
    } 

    time=System.currentTimeMillis()-time; 
} 

} 

Answer 1

相反的：logScrool.add(log);使用下面的行添加日誌JScrollPane：
logScrool.setViewportView(log);