[Java]LeetCode1195. Fizz Buzz多线程 | Fizz Buzz Multithreaded

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Write a program that outputs the string representation of numbers from 1 to n, however:

• If the number is divisible by 3, output "fizz".
• If the number is divisible by 5, output "buzz".
• If the number is divisible by both 3 and 5, output "fizzbuzz".

For example, for n = 15, we output: 1, 2, fizz, 4, buzz, fizz, 7, 8, fizz, buzz, 11, fizz, 13, 14, fizzbuzz.

Suppose you are given the following code:

class FizzBuzz {
  public FizzBuzz(int n) { ... }               // constructor
  public void fizz(printFizz) { ... }          // only output "fizz"
  public void buzz(printBuzz) { ... }          // only output "buzz"
  public void fizzbuzz(printFizzBuzz) { ... }  // only output "fizzbuzz"
  public void number(printNumber) { ... }      // only output the numbers
}

Implement a multithreaded version of FizzBuzz with four threads. The same instance of FizzBuzz will be passed to four different threads:

1. Thread A will call fizz() to check for divisibility of 3 and outputs fizz.
2. Thread B will call buzz() to check for divisibility of 5 and outputs buzz.
3. Thread C will call fizzbuzz() to check for divisibility of 3 and 5 and outputs fizzbuzz.
4. Thread D will call number() which should only output the numbers.

---

 1 class FizzBuzz {
 2     
 3     private int n;
 4     private int currentNumber = 1;
 5     
 6     public FizzBuzz(int n) {
 7         this.n = n;
 8     }
 9 
10     // printFizz.run() outputs "fizz".
11     public synchronized void fizz(Runnable printFizz) throws InterruptedException {
12         while (currentNumber <= n) {
13             if (currentNumber % 3 != 0 || currentNumber % 5 == 0) {
14                 wait();
15                 continue;
16             }
17             printFizz.run();
18             currentNumber += 1;
19             notifyAll();
20         }
21     }
22 
23     // printBuzz.run() outputs "buzz".
24     public synchronized void buzz(Runnable printBuzz) throws InterruptedException {
25         while (currentNumber <= n) {
26             if (currentNumber % 5 != 0 || currentNumber % 3 == 0) {
27                 wait();
28                 continue;
29             }
30             printBuzz.run();
31             currentNumber += 1;
32             notifyAll();
33         }
34     }
35 
36     // printFizzBuzz.run() outputs "fizzbuzz".
37     public synchronized void fizzbuzz(Runnable printFizzBuzz) throws InterruptedException {
38         while (currentNumber <= n) {
39             if (currentNumber % 15 != 0) {
40                 wait();
41                 continue;
42             }
43             printFizzBuzz.run();
44             currentNumber += 1;
45             notifyAll();
46         }
47     }
48 
49     // printNumber.accept(x) outputs "x", where x is an integer.
50     public synchronized void number(IntConsumer printNumber) throws InterruptedException {
51         while (currentNumber <= n) {
52             if (currentNumber % 3 == 0 || currentNumber % 5 == 0) {
53                 wait();
54                 continue;
55             }
56             printNumber.accept(currentNumber);
57             currentNumber += 1;
58             notifyAll();
59         }
60     }
61 }