Java应用程序挂起在Fedora中但不在Windows中

Question

当我学习 Thinking in Java（4th）一书时。我只需键入concurrency / CriticalSection.java代码并在Fedora的终端中运行它，但它挂断了。

我在Windows cmd中运行它。有用。

我不知道为什么它会挂在Fedora中而不是在Windows中。

我真的做了一点分析。当我将 System.out.println（name）添加到PairManipulator的run（）方法时。它解决了结果，但是当我评论它时，应用程序没有给出结果，它只是挂在那里。

JDK＆amp; JVM信息：

视窗：

java version "1.8.0_25"
Java<TM> SE Runtime Environment (build 1.8.0_25-b18)
Java HotSpot<TM> 64-bit Server VM(build 25.25-b02, mixed mode)

Fedora的：

openjdk version "1.8.0_45"
OpenJDK Runtime Environment (build 1.8.0_45-b14)
OpenJDK 64-Bit Server VM (build 25.45-b02, mixed mode)

以下是代码：

package concurrency;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;


class Pair{
    private int x, y;
    public Pair(int x, int y){
        this.x = x;
        this.y = y;
    }

    public Pair(){
        this(0, 0);
    }

    public int getX(){
        return x;
    }

    public int getY(){
        return y;
    }

    public void incrementX(){
        x++;
    }

    public void incrementY(){
        y++;
    }

    public String toString(){
        return "x: " + x + ", y: " + y;
    }

    public class PairValuesNotEqualException extends RuntimeException{
        public PairValuesNotEqualException(){
            super("Pair values not equal: " + Pair.this);
        }
    }

    public void checkState(){
        if(x != y)
            throw new PairValuesNotEqualException();
    }
}


abstract class PairManager{
    AtomicInteger checkCounter = new AtomicInteger(0);
    protected Pair p = new Pair();
    private List<Pair> storage = 
            Collections.synchronizedList(new ArrayList<Pair>());

    public synchronized Pair getPair(){
        return new Pair(p.getX(), p.getY());
    }

    protected void store(Pair p){
        storage.add(p);
        try {
            TimeUnit.MILLISECONDS.sleep(50);
        } catch (InterruptedException e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }

    }

    public abstract void increment();

}

class PairManager1 extends PairManager{

    @Override
    public synchronized void increment() {
        // TODO 自动生成的方法存根
        p.incrementX();
        p.incrementY();
        store(getPair());
    }

}

class PairManager2 extends PairManager{

    @Override
    public void increment() {
        // TODO 自动生成的方法存根
        Pair temp;
        synchronized(this){
            p.incrementX();
            p.incrementY();
            temp = getPair();
        }

        store(temp);
    }

}

class PairManipulator implements Runnable{
    private PairManager pm;
    //private String name;
    public PairManipulator(PairManager pm){
        this.pm = pm;
        //this.name = name;
    }


    @Override
    public void run() {
        // TODO 自动生成的方法存根
        while(true){
            //System.out.println(name);
            pm.increment();

        }

    }

    public String toString(){
        return "Pair: " + pm.getPair() + " checkCounter  = " + pm.checkCounter.get();
    }

}

class PairChecker implements Runnable{
    private PairManager pm;
    //private String name;
    public PairChecker(PairManager pm){
        this.pm = pm;
        //this.name = name;
    }

    @Override
    public void run() {
        // TODO 自动生成的方法存根
        while(true){
            //System.out.println(name);
            pm.checkCounter.incrementAndGet();
            pm.getPair().checkState();
        }
    }
}

public class CriticalSection {

    static void testApproaches(PairManager pman1, PairManager pman2){
        ExecutorService exec = Executors.newCachedThreadPool();
        PairManipulator
            pm1 = new PairManipulator(pman1),
            pm2 = new PairManipulator(pman2);

        PairChecker
            pcheck1 = new PairChecker(pman1),
            pcheck2 = new PairChecker(pman2);


        exec.execute(pm1);
        exec.execute(pm2);
        exec.execute(pcheck1);
        exec.execute(pcheck2);


        try {
            TimeUnit.MILLISECONDS.sleep(500);
        } catch (InterruptedException e) {
            // TODO 自动生成的 catch 块
            System.out.println("Sleep interrupted");
        }

        System.out.println("pm1: " + pm1 + "\npm2: " + pm2);
        System.exit(0);
    }

    public static void main(String[] args) {
        // TODO 自动生成的方法存根

        PairManager
            pman1 = new PairManager1(),
            pman2 = new PairManager2();

        testApproaches(pman1, pman2);

    }

}