思路：

和生产者消费者模型一样。

public class Computer {
    private static int count = 0; // 生产的个数
    private String name;    // 电脑的名称
    private double price;       // 电脑的价格
    public Computer(String name, double price){
        this.name = name;
        this.price = price;
        count ++ ;
    }
    public String toString(){
        return "第【" + count + "台电脑】" + " - 电脑名称：" + this.name + "\t电脑价格: " + this.price;
    }
}

public class Resource { //操作类
    private Computer computer;
    public synchronized void create(){
        if (this.computer != null){ // 已经生产了电脑，等待取走
            try {
                super.wait();   // 等待取走
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        try {
            Thread.sleep(100);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println("生产完毕！");
        this.computer = new Computer("ASUS",1000);
        super.notifyAll();
    }
    public synchronized void get(){
        if (this.computer == null){
            try {
                super.wait();   // 等待生产
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        System.out.println(this.computer);
        this.computer = null;   // 已经取走电脑，没有电脑了
        super.notifyAll();
    }

}

public class Producer implements Runnable{  // 生产电脑线程类
    private Resource resource;
    public Producer(Resource resource){
        this.resource = resource;
    }

    @Override
    public void run() {
        for (int i = 0; i < 10; i++) {
            this.resource.create();
        }
    }
}

public class Comsumer implements Runnable{  // 取走电脑线程类
    private Resource resource;
    public Comsumer(Resource resource){
        this.resource = resource;
    }

    @Override
    public void run() {
        for (int i = 0; i < 10; i++) {
            this.resource.get();
        }
    }
}

public class Main {
    public static void main(String[] args) {
        Resource resource = new Resource();
        new Thread(new Producer(resource)).start();
        new Thread(new Comsumer(resource)).start();
    }
}

输出结果：

这个操作不用考虑同步等问题，直接使用等待与唤醒机制就行了，一进一出就搞定。