我正在使用线程构建GUI文本编辑器。在这个编辑器中，一个线程用于计算文本区域中的单词和char的数量，另一个线程用于在给定的时间间隔内保存文件（尚未实现）。
主窗口GUI
import java.util.Calendar;
import java.util.Locale;
public class MainWindow extends javax.swing.JFrame {
/**
* Creates new form MainWindow
*/
private long initial,last;
public MainWindow() {
initComponents();
Operation op = new Operation(this);
// new FileOperation(op, "demo.txt");
new Count(op);
}
public void saveFile(){
}
public void countUpdate(String wordCount){
System.out.println(wordCount);
counting.setText(wordCount);
}
public long getTime(){ return last-initial;}
public String getInput(){ return textfield.getText();}
/**
* 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">//GEN-BEGIN:initComponents
private void initComponents() {
jScrollPane1 = new javax.swing.JScrollPane();
textfield = new javax.swing.JTextArea();
save = new javax.swing.JLabel();
counting = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
textfield.setColumns(20);
textfield.setRows(5);
textfield.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyPressed(java.awt.event.KeyEvent evt) {
textfieldKeyPressed(evt);
}
public void keyReleased(java.awt.event.KeyEvent evt) {
textfieldKeyReleased(evt);
}
});
jScrollPane1.setViewportView(textfield);
save.setText(" ");
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, false)
.addGroup(layout.createSequentialGroup()
.addComponent(save, javax.swing.GroupLayout.PREFERRED_SIZE, 75, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(counting, javax.swing.GroupLayout.PREFERRED_SIZE, 103, javax.swing.GroupLayout.PREFERRED_SIZE))
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 370, javax.swing.GroupLayout.PREFERRED_SIZE))
.addContainerGap(18, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(26, 26, 26)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 240, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(save)
.addGap(0, 0, Short.MAX_VALUE))
.addComponent(counting, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addContainerGap())
);
pack();
}// </editor-fold>//GEN-END:initComponents
private void textfieldKeyReleased(java.awt.event.KeyEvent evt) {//GEN-FIRST:event_textfieldKeyReleased
// TODO add your handling code here:
last = Calendar.getInstance().getTimeInMillis();
}//GEN-LAST:event_textfieldKeyReleased
private void textfieldKeyPressed(java.awt.event.KeyEvent evt) {//GEN-FIRST:event_textfieldKeyPressed
// TODO add your handling code here:
if(getTime() > 1000)
notifyAll();
initial = Calendar.getInstance().getTimeInMillis();
}//GEN-LAST:event_textfieldKeyPressed
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
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(MainWindow.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(MainWindow.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(MainWindow.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(MainWindow.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new MainWindow().setVisible(true);
}
});
}
// Variables declaration - do not modify//GEN-BEGIN:variables
private javax.swing.JLabel counting;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JLabel save;
private javax.swing.JTextArea textfield;
// End of variables declaration//GEN-END:variables
}
COUNT.JAVA
import java.util.logging.Level;
import java.util.logging.Logger;
/*
* 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.
*/
/**
*
* @author DEV
*/
public class Count implements Runnable{
Operation target;
Thread t;
public Count(Operation operation) {
target = operation;
t = new Thread(this,"Counting Thread");
t.start();
}
@Override
public void run() {
while(true){
target.countWord();
}
}
}
Operation.java
import java.io.FileWriter;
import java.io.IOException;
import java.util.StringTokenizer;
import java.util.logging.Level;
import java.util.logging.Logger;
/*
* 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.
*/
/**
*
* @author DEV
*/
public class Operation {
boolean flag= true;
MainWindow window ;
String text ;
Operation(MainWindow window){
this.window = window;
this.text="";
}
synchronized public void save(FileWriter data){
try {
while(flag)
{
wait();
}
data.write(text);
data.close();
flag = true;
} catch (IOException ex) {
Logger.getLogger(Operation.class.getName()).log(Level.SEVERE, null, ex);
} catch (InterruptedException ex) {
Logger.getLogger(Operation.class.getName()).log(Level.SEVERE, null, ex);
}
}
synchronized public void countWord(){
while(!flag){
try {
wait();
} catch (InterruptedException ex) {
Logger.getLogger(Operation.class.getName()).log(Level.SEVERE, null, ex);
}
}
String result;
StringTokenizer token= null;
text = window.getInput();
if(text.length() > 0)
{
token = new StringTokenizer(text);
result = token.countTokens() + " w, "+ text.length()+" c";
window.countUpdate(result);
}
else{
result =" 0 w, 0,c";
}
flag = true;
}
}
答案 0 :(得分：0)
Count中的线程正在运行无限循环：
while(true){
target.countWord();
}
所以这将消耗大量的CPU周期。
需要改变整个方法。看看event listeners。例如，当用户按下某个键时，将是更新计数的好机会。