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FizzBuzzSemaphore.java
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133 lines (111 loc) · 3.26 KB
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import java.util.concurrent.Semaphore;
import java.util.function.IntConsumer;
/**
* @author JackWu
* @version 1.0
*/
public class FizzBuzzSemaphore {
public static void main(String[] args) {
FizzBuzz fizzBuzz = new FizzBuzz(15);
new Thread(() -> {
try {
fizzBuzz.fizz(new Print("fizz"));
} catch (InterruptedException e) {
e.printStackTrace();
}
}, "fizz").start();
new Thread(() -> {
try {
fizzBuzz.buzz(new Print("buzz"));
} catch (InterruptedException e) {
e.printStackTrace();
}
}, "buzz").start();
new Thread(() -> {
try {
fizzBuzz.fizzbuzz(new Print("fizzbuzz"));
} catch (InterruptedException e) {
e.printStackTrace();
}
}, "fizzbuzz").start();
new Thread(() -> {
try {
fizzBuzz.number(new PrintX());
} catch (InterruptedException e) {
e.printStackTrace();
}
}, "number").start();
}
}
class FizzBuzz {
private int n;
private Semaphore fizz = new Semaphore(0);
private Semaphore buzz = new Semaphore(0);
private Semaphore fizzbuzz = new Semaphore(0);
private Semaphore number = new Semaphore(1);
public FizzBuzz(int n) {
this.n = n;
}
// printFizz.run() outputs "fizz".
public void fizz(Runnable printFizz) throws InterruptedException {
for (int i = 1; i <= n ; i ++) {
if (i % 3 == 0 && i % 5 !=0) {
fizz.acquire();
printFizz.run();
number.release();
}
}
}
// printBuzz.run() outputs "buzz".
public void buzz(Runnable printBuzz) throws InterruptedException {
for (int i = 1; i <= n ; i ++){
if (i % 5 == 0 && i % 3 != 0) {
buzz.acquire();
printBuzz.run();
number.release();
}
}
}
// printFizzBuzz.run() outputs "fizzbuzz".
public void fizzbuzz(Runnable printFizzBuzz) throws InterruptedException {
for (int i = 1; i <= n; i ++) {
if (i % 3 == 0 && i % 5 == 0) {
fizzbuzz.acquire();
printFizzBuzz.run();
number.release();
}
}
}
// printNumber.accept(x) outputs "x", where x is an integer.
public void number(IntConsumer printNumber) throws InterruptedException {
for (int i = 1; i <= n; i ++) {
number.acquire();
if (i % 3 == 0 && i % 5 == 0) {
fizzbuzz.release();
}else if (i % 3 == 0) {
fizz.release();
}else if (i % 5 == 0) {
buzz.release();
}else {
printNumber.accept(i);
number.release();
}
}
}
}
class Print implements Runnable {
public Print(String str) {
this.str = str;
}
private String str = "";
@Override
public void run() {
System.out.println(str);
}
}
class PrintX implements IntConsumer {
@Override
public void accept(int value) {
System.out.println(value);
}
}