如何在其内存空间中保持堆栈多线程

Question

我想知道在java中开发线程池的最佳方法是什么  执行多任务，以及如何在此示例程序执行时堆栈内存。  请解释一下实现线程池的最佳方法是什么？

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.regex.Pattern;

class A implements Runnable {

    @Override
    public void run() {
        System.out.println("A  "+Thread.currentThread().getName());
    }

}

class B implements Runnable {

    @Override
    public void run() {
        System.out.println("B "+Thread.currentThread().getName());
    }

}

class C implements Runnable {

    @Override
    public void run() {
        System.out.println("C  "+Thread.currentThread().getName());
    }

}

public class threadrunner {

    public static void main(String[] args) {
        ExecutorService bn = Executors.newFixedThreadPool(2);
        Runnable t1 = new A();
        Runnable t2 = new B();
        Runnable t3 = new C();
        bn.execute(t1);
          bn.execute(t2);
            bn.execute(t3);

       bn.shutdwon();
    }

}