Java如何手动创建线程池

ThreadPoolExecutor(int corePoolSize, 
int maximumPoolSize, 
long keepAliveTime, 
TimeUnit unit, 
BlockingQueue<Runnable> workQueue)

ThreadPoolExecutor(int corePoolSize, 
int maximumPoolSize, 
long keepAliveTime, 
TimeUnit unit, 
BlockingQueue<Runnable> workQueue, 
RejectedExecutionHandler handler)

ThreadPoolExecutor(int corePoolSize, 
int maximumPoolSize,
long keepAliveTime,
BlockingQueue<Runnable> workQueue, 
ThreadFactory threadFactory)

ThreadPoolExecutor(int corePoolSize, 
int maximumPoolSize, 
long keepAliveTime, 
TimeUnit unit,
BlockingQueue<Runnable> workQueue, 
RejectedExecutionHandler handler)

public class ThreadPool {
    
    static int corePoolSize = 10;
    
    static int maximumPoolSizeSize = 100;
    
    static long keepAliveTime = 1;
    
    static ArrayBlockingQueue workQueue = new ArrayBlockingQueue(10);
    public static void main(String[] args) {
        ThreadPoolExecutor executor = new ThreadPoolExecutor(
                corePoolSize,
                maximumPoolSizeSize,
                keepAliveTime,
                TimeUnit.SECONDS,
                workQueue,
                new ThreadFactoryBuilder().setNameFORMat("XX-task-%d").build());
        //提交一个任务
        executor.execute(() -> System.out.println("ok"));
    }
}

public void execute(Runnable command) {
        if (command == null)
            throw new NullPointerException();
        
        int c = ctl.get();
        if (workerCountOf(c) < corePoolSize) {
            if (addWorker(command, true))
                return;
            c = ctl.get();
        }
        if (isRunning(c) && workQueue.offer(command)) {
            int recheck = ctl.get();
            if (! isRunning(recheck) && remove(command))
                reject(command);
            else if (workerCountOf(recheck) == 0)
                addWorker(null, false);
        }
        else if (!addWorker(command, false))
            reject(command);
    }

public class ThreadPoolUtils {
    public static ThreadPoolExecutor pool=null;
    // 无响应执行
    public static void execute(Runnable runnable){
        getThreadPool().execute(runnable);
    }
    // 有响应执行
    public static<T> Future<T> submit(Callable<T> callable){
        return getThreadPool().submit(callable);
    }
    // 创造线程池
    private static synchronized ThreadPoolExecutor getThreadPool(){
        if(pool==null){
            // 获取处理器数量
            int cpuNum = Runtime.getRuntime().availableProcessors();
            // 根据cpu数量,计算出合理的线程并发数
            // 最佳线程数目 = （（线程等待时间+线程CPU时间）/线程CPU时间 ）* CPU数目
            int maximumPoolSize = cpuNum * 2 + 1;
            // 七个参数
            // 1. 核心线程数
            // 2. 最大线程数
            // 3. 空闲线程最大存活时间
            // 4. 时间单位
            // 5. 阻塞队列
            // 6. 创建线程工厂
            // 7. 拒绝策略
            pool=new ThreadPoolExecutor(maximumPoolSize-1,
            maximumPoolSize,
            5,
            TimeUnit.SECONDS,
            new ArrayBlockingQueue<>(50),
            Executors.defaultThreadFactory(),
            new ThreadPoolExecutor.AbortPolicy());
        }
        return pool;
    }
}