代碼為下面：為什么運行會出現(xiàn)奇數(shù)結果？ 《java編程思想》的里面的解釋沒有看懂，能夠請大神解釋一下其中原理。import java.util.concurrent.*;public class EvenGenerator extends IntGenerator {  private int currentEvenValue = 0;  public int next() {    ++currentEvenValue; // Danger point here!    ++currentEvenValue;    return currentEvenValue;  }  public static void main(String[] args) {    EvenChecker.test(new EvenGenerator() ,10);  }} public class EvenChecker implements Runnable {  private IntGenerator generator;  private final int id;  public EvenChecker(IntGenerator g, int ident) {    generator = g;    id = ident;  }  public void run() {    while(!generator.isCanceled()) {      int val = generator.next();    //   System . out . println ( val ) ;               if(val % 2 != 0) {        System.out.println(val + " not even!");        generator.cancel(); // Cancels all EvenCheckers      }    }  }  // Test any type of IntGenerator:  public static void test(IntGenerator gp, int count) {    System.out.println("Press Control-C to exit");    ExecutorService exec = Executors.newCachedThreadPool();    for(int i = 0; i < count; i++)      exec.execute(new EvenChecker(gp, i));    exec.shutdown();  }   }}