import java.util.concurrent.Semaphore;
public class Program{
    public static void main(String[] agrs){
        PrintQueue p=new PrintQueue();
        Thread[] ths=new Thread[10];
        for(int i=0;i<10;i++){
            ths[i]=new Thread(new Job(p),"Thread"+i);
        }
        for(int i=0;i<10;i++){
            ths[i].start();
        }
    }
}
class PrintQueue{
    private Semaphore s;
    public PrintQueue(){
        s=new Semaphore(1);//二進(jìn)制信號(hào)量
    }
    public void printJob(Object document){
        try{
            s.acquire();
            long duration=(long)(Math.random()*100);
            System.out.printf("線程名：%s 睡眠：%d",Thread.currentThread().getName(),duration);
            Thread.sleep(duration);
        }
        catch(InterruptedException e){
            e.printStackTrace();
        }
        finally{
            s.release();
        }
    }
}
class Job implements Runnable{
    private PrintQueue p;
    public Job(PrintQueue p){
        this.p=p;
    }
    @Override
    public void run(){
        System.out.printf("%s:正在打印一個(gè)任務(wù)\n ",Thread.currentThread().getName());
        this.p.printJob(new Object());
        System.out.printf("%s:文件已打印完畢\n ",Thread.currentThread().getName());
    }
}

import java.util.concurrent.Semaphore;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
public class Program{
    public static void main(String[] agrs){
        PrintQueue p=new PrintQueue();
        Thread[] ths=new Thread[10];
        for(int i=0;i<10;i++){
            ths[i]=new Thread(new Job(p),"Thread"+i);
        }
        for(int i=0;i<10;i++){
            ths[i].start();
        }
    }
}
class PrintQueue{
    private Semaphore s;
    private boolean[] freePrinters;
    private Lock lock;
    public PrintQueue(){
        s=new Semaphore(3);//二進(jìn)制信號(hào)量
        freePrinters=new boolean[3];
        for(int i=0;i<3;i++){
            freePrinters[i]=true;
        }
        lock=new ReentrantLock();
    }
    public void printJob(Object document){
        try{
            s.acquire();
            int printerIndex=getIndex();
                long duration=(long)(Math.random()*100);
                System.out.printf("線程名：%s 睡眠：%d\n",Thread.currentThread().getName(),duration);
                Thread.sleep(duration);
                freePrinters[printerIndex]=true;//恢復(fù)信號(hào)，供下次使用
        }
        catch(InterruptedException e){
            e.printStackTrace();
        }
        finally{
            s.release();
        }
    }
    //返回一個(gè)內(nèi)部分組后的同步索引
    public int getIndex(){
        int index=-1;
        try{
            lock.lock();
            for(int i=0;i<freePrinters.length;i++){
                if(freePrinters[i]){
                    freePrinters[i]=false;
                    index=i;
                    break;
                }
            }
     }
     catch(Exception e){
         e.printStackTrace();
     }
     finally{
         lock.unlock();
     }
     return index;
    }
}
class Job implements Runnable{
    private PrintQueue p;
    public Job(PrintQueue p){
        this.p=p;
    }
    @Override
    public void run(){
        System.out.printf("%s:正在打印一個(gè)任務(wù)\n ",Thread.currentThread().getName());
        this.p.printJob(new Object());
        System.out.printf(" %s:文件已打印完畢\n ",Thread.currentThread().getName());
    }
}

import java.util.concurrent.CountDownLatch;
public class Program{
    public static void main(String[] agrs){
        //開啟可容納10人的會(huì)議室
        VideoConference v=new VideoConference(10);
        new Thread(v).start();
        //參與人員陸續(xù)進(jìn)場(chǎng)
        for(int i=0;i<10;i++){
            Participant p=new Participant(i+"號(hào)人員",v);
            new Thread(p).start();
        }
    }
}
class VideoConference implements Runnable{
    private CountDownLatch controller;
    public VideoConference(int num){
        controller=new CountDownLatch(num);
    }
    public void arrive(String name){
        System.out.printf("%s 已經(jīng)到達(dá)！\n",name);
        controller.countDown();
        System.out.printf("還需要等 %d 個(gè)成員！\n",controller.getCount());
    }
    @Override
    public void run(){
        try{
            System.out.printf("會(huì)議正在初始化...!\n");
            controller.await();
            System.out.printf("所有人都到齊了，開會(huì)吧!\n");
        }
        catch(InterruptedException e){
            e.printStackTrace();
        }
    }
}
class Participant implements Runnable{
    private VideoConference conference;
    private String name;
    public Participant(String name,VideoConference conference){
        this.name=name;
        this.conference=conference;
    }
    @Override
    public void run(){
        long duration=(long)(Math.random()*100);
        try{
            Thread.sleep(duration);
            conference.arrive(this.name);
     }
     catch(InterruptedException e){
     }
    }
}

import java.util.concurrent.Phaser;
import java.util.concurrent.TimeUnit;
import java.util.List;
import java.util.ArrayList;
import java.io.File;
import java.util.Date;
public class Program{
    public static void main(String[] agrs){
        Phaser phaser=new Phaser(3);
        FileSearch system=new FileSearch("C:\\Windows", "log",phaser);
        FileSearch apps=new FileSearch("C:\\Program Files","log",phaser);
        FileSearch documents=new FileSearch("C:\\Documents And Settings","log",phaser);
        Thread systemThread=new Thread(system,"System");
        systemThread.start();
        Thread appsThread=new Thread(apps,"Apps");
        appsThread.start();
        Thread documentsThread=new Thread(documents, "Documents");
        documentsThread.start();
        try {
            systemThread.join();
            appsThread.join();
            documentsThread.join();
            } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println("Terminated: "+ phaser.isTerminated());
    }
}
class FileSearch implements Runnable{
    private String initPath;
    private String end;
    private List<String> results;
    private Phaser phaser;
    public FileSearch(String initPath,String end,Phaser phaser){
        this.initPath=initPath;
        this.end=end;
        this.results=new ArrayList<String>();
        this.phaser=phaser;
    }
    private void directoryProcess(File file){
        File[] files=file.listFiles();
        if(files!=null){
            for(int i=0;i<files.length;i++){
                if(files[i].isDirectory()){
                    directoryProcess(files[i]);
                }
                else{
                    fileProcess(files[i]);
                }
            }
        }
    }
    private void fileProcess(File file){
        if(file.getName().endsWith(end)){
            results.add(file.getAbsolutePath());
        }
    }
    private void filterResults(){
        List<String> newResults=new ArrayList<String>();
        long actualDate=new Date().getTime();
        for(int i=0;i<results.size();i++){
            File file=new File(results.get(i));
            long fileDate=file.lastModified();
            if(actualDate-fileDate<TimeUnit.MILLISECONDS.convert(1,TimeUnit.DAYS)){
                newResults.add(results.get(i));
            }
        }
        results=newResults;
    }
    private boolean checkResults(){
        if(results.isEmpty()){
            System.out.printf("%s: Phase %d: 0 results.\n",Thread.currentThread().getName(),phaser.getPhase());
            System.out.printf("%s: Phase %d: End.\n",Thread.currentThread().getName(),phaser.getPhase());
            phaser.arriveAndDeregister();
        }
        else{
            System.out.printf("%s: Phase %d: %d results.\n",Thread.currentThread().getName(),phaser.getPhase(),results.size());
             phaser.arriveAndAwaitAdvance();
            return true;
        }
    }
    private void showInfo() {
        for (int i=0; i<results.size(); i++){
            File file=new File(results.get(i));
            System.out.printf("%s: %s\n",Thread.currentThread().getName(),file.getAbsolutePath());
        }
        phaser.arriveAndAwaitAdvance();
    }
    @Override
    public void run(){
        File file=new File(initPath);
        if(file.isDirectory()){
            directoryProcess(file);
        }
        if(!checkResults()){
            return;
        }
        filterResults();
        if(!checkResults()){
            return;
        }
        showInfo();
        phaser.arriveAndDeregister();
        System.out.printf("%s: Work completed.\n",Thread.currentThread().getName());
    }
}