[英]start() method doesn't exist
這是我的第一個多線程應用程序,遇到了一些困難。 我正在創建一個名為Runsable的TextDistanceThread類的新對象,但是當我嘗試調用start()時,編輯器告訴我不存在這樣的方法,並且該文件將無法編譯。 這是我的驅動程序類:
public class Driver {
static float [][] results = new float[30][6];
public static void main(String [] args) throws FileNotFoundException {
Runnable [] threads = new TextDistanceThread[180];
int threadCount = 0;
for(int i = 0 ; i < 30 ; i++) {
threads[threadCount] = new TextDistanceThread("Macbeth.txt", "Othello.txt", i, 0);
threads[threadCount++].start();
threads[threadCount] = new TextDistanceThread("Macbeth.txt", "HuckFinn.txt", i, 1);
threads[threadCount++].start();
threads[threadCount] = new TextDistanceThread("Macbeth.txt", "TomSawyer.txt", i, 2);
threads[threadCount++].start();
threads[threadCount] = new TextDistanceThread("Othello.txt", "HuckFinn.txt", i, 3);
threads[threadCount++].start();
threads[threadCount] = new TextDistanceThread("Othello.txt", "TomSawyer.txt", i, 4);
threads[threadCount++].start();
threads[threadCount] = new TextDistanceThread("TomSawyer.txt", "HuckFinn.txt", i, 5);
threads[threadCount++].start();
}
}
}
這是TextDistanceThread類:公共類TextDistanceThread實現了Runnable {
final int numTexts;
Dictionary<String, Integer>[] texts;
Dictionary<String, Float>[] normalized;
float difference;
int [] lengths;
int row, col;
public TextDistanceThread(String file1, String file2, int row, int col) throws FileNotFoundException {
numTexts = 2;
texts = new Dictionary[numTexts];
normalized = new Dictionary[numTexts];
for (int text = 0 ; text < numTexts ; text++) {
texts[text] = new Dictionary<String, Integer>();
normalized[text] = new Dictionary<String, Float>();
}
difference = 0;
lengths = new int[numTexts];
this.row = row;
this.col = col;
//Read file into dictionary without punctuation
if(new File(file1).exists()) {System.out.println("File " + file1 + " found");}
Scanner text = new Scanner(new File(file1));
while (text.hasNext()) {
lengths[0]++;
String temp = text.next().toLowerCase().replaceAll("(?!\')\\p{Punct}", "");
if (!texts[0].add(temp, 1)) {
texts[0].set(temp, texts[0].lookup(temp) + 1);
}
}
if(new File(file2).exists()) {System.out.println("File " + file2 + " found");}
text = new Scanner(new File(file2));
while (text.hasNext()) {
lengths[1]++;
String temp = text.next().toLowerCase().replaceAll("(?!\')\\p{Punct}", "");
if (!texts[1].add(temp, 1)) {
texts[1].set(temp, texts[1].lookup(temp) + 1);
}
}
}
public void run() {
System.out.println("Normalizing:");
//Normalize dictionaries
for(int i = 0 ; i < numTexts ; i++) {
texts[i].reset();
normalized[i].add((String) texts[i].getCurrentPair().getKey(), (float)texts[i].getCurrent() / lengths[i]);
while(texts[i].hasNext()) {
texts[i].next();
normalized[i].add((String) texts[i].getCurrentPair().getKey(), (float)texts[i].getCurrent() / lengths[i]);
}
}
//Find the difference
texts[0].reset();
System.out.println("Cross-checking:");
while(normalized[0].hasNext()) {
if(normalized[1].contains(normalized[0].getCurrentPair().getKey())) {
difference += Math.abs(normalized[0].getCurrent() - normalized[1].lookup((String)normalized[0].getCurrentPair().getKey()));
//System.out.println(normalized[0].getCurrentPair() + Float.toString(Math.abs(normalized[0].getCurrent() - normalized[1].lookup((String) normalized[0].getCurrentPair().getKey()))));
normalized[1].remove(normalized[0].getCurrentPair().getKey());
normalized[0].remove();
normalized[0].reset();
}
else {
normalized[0].next();
}
}
System.out.println("Adding:");
for(int i = 0 ; i < numTexts ; i++) {
normalized[i].reset();
difference += normalized[i].getCurrent();
//System.out.println(normalized[i].getCurrentPair() + Float.toString(normalized[i].getCurrent()));
while(normalized[i].hasNext()) {
difference += Math.abs(normalized[i].getNext());
//System.out.println(normalized[i].getCurrentPair() + Float.toString(normalized[i].getCurrent()));
}
}
Driver.results[row][col] = difference;
}
}
我在整個地方都使用Google搜索,似乎沒有其他人遇到這個問題。 我確信我缺少了非常明顯的東西。
另外,關於調度我應該了解什么?
Runnable
接口未聲明start()
方法。 這就是為什么您不能調用它。
使用Runnable
啟動線程的標准方法是將Runnable
實例傳遞給Thread
,然后在Thread
上調用start()
。
創建一個Thread
數組,使用您的Runnable
創建Thread
,然后在這些Thread
上調用start()
。
Thread[] threads = new Thread[180];
例如
threads[threadCount] = new Thread(
new TextDistanceThread("Macbeth.txt", "Othello.txt", i, 0));
JVM會為您安排線程。 您無需擔心安排時間。
由於Runnable
接口沒有start()
方法。 您應該將Runnable
實例傳遞給Thread
。 您可以使用像
new Thread(threads[threadCount++]).start();
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