多线程-交替打印字符串-leetcode1195

题目

题目来源：力扣（LeetCode）
链接：https://leetcode-cn.com/problems/fizz-buzz-multithreaded

• 编写一个可以从 1 到 n 输出代表这个数字的字符串的程序，但是：
  如果这个数字可以被 3 整除，输出 "fizz"。
  如果这个数字可以被 5 整除，输出 "buzz"。
  如果这个数字可以同时被 3 和 5 整除，输出 "fizzbuzz"。

思路

• volatile+(锁)synchronized
• 原子类

代码

原子类

import java.util.concurrent.atomic.AtomicInteger;

class Test3 {
    private int n;
    AtomicInteger atomicInteger = new AtomicInteger(1);
    public Test3(int n){
        this.n = n;
    }

    // printFizz.run() outputs "fizz".
    public void fizz() throws InterruptedException{
        while (atomicInteger.get() <= n) {
            int k = atomicInteger.get();
            if(k % 3 == 0 && k % 5 != 0 && k <= n){
                System.out.println("fizz");
                atomicInteger.incrementAndGet();
            }

        }
    }

    // printBuzz.run() outputs "buzz".
    public void buzz() throws InterruptedException{
        while (atomicInteger.get() <= n) {
            int k = atomicInteger.get();
            if(k % 3 != 0 && k % 5 == 0 && k <= n){
                System.out.println("buzz");
                atomicInteger.incrementAndGet();
            }

        }
    }

    // printFizzBuzz.run() outputs "fizzbuzz".
    public void fizzbuzz() throws InterruptedException{
        while (atomicInteger.get() <= n) {
            int k = atomicInteger.get();
            if(k % 3 == 0 && k % 5 == 0 && k <= n){
                System.out.println("fizzbuzz");
                atomicInteger.incrementAndGet();
            }
        }
    }

    // printNumber.accept(x) outputs "x", where x is an integer.
    public void number() throws InterruptedException{
        while (atomicInteger.get() <= n) {
            int k = atomicInteger.get();
            if(k % 3 != 0 && k % 5 != 0 && k <= n){
                System.out.println(k);
                atomicInteger.incrementAndGet();
            }

        }
    }

    public static void main(String[] args) throws InterruptedException{
        Test3 test3 = new Test3(15);
        Thread thread1 = new Thread(() -> {
            try {
                test3.number();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        });

        Thread thread2 = new Thread(() -> {
            try {
                test3.fizz();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        });

        Thread thread3 = new Thread(() -> {
            try {
                test3.buzz();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        });
        Thread thread4 = new Thread(() -> {
            try {
                test3.fizzbuzz();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        });
        thread1.start();
        thread2.start();
        thread3.start();
        thread4.start();
        thread1.join();
        thread2.join();
        thread3.join();
        thread4.join();
    }
}