多線程按序交替打印
阿新 • • 發佈:2019-01-20
exce stat rri imp num exception abc main trace
一、線程按序交替打印
效果展示:
A 1
A 2
A 3
A 4
A 5
B 1
B 2
B 3
B 4
B 5
C 1
C 2
C 3
C 4
C 5
代碼實現:
package juc; import java.util.concurrent.locks.Condition; import java.util.concurrent.locks.ReentrantLock; public class AlternativePrint { private ReentrantLock lock = new ReentrantLock(); private Condition conditionA = lock.newCondition(); private Condition conditionB = lock.newCondition(); private Condition conditionC = lock.newCondition(); private int number = 1; public void loopA(){ lock.lock(); try { if (number != 1){ conditionA.await(); } for (int i = 1; i <= 5; i++){ System.out.println(Thread.currentThread().getName() + " " + i); } number = 2; conditionB.signal(); } catch (InterruptedException e) { e.printStackTrace(); } finally { lock.unlock(); } } public void loopB(){ lock.lock(); try { if (number != 2){ conditionB.await(); } for (int i = 1; i <= 5; i++){ System.out.println(Thread.currentThread().getName() + " " + i); } number = 3; conditionC.signal(); } catch (InterruptedException e) { e.printStackTrace(); } finally { lock.unlock(); } } public void loopC(){ lock.lock(); try { if (number != 3){ conditionC.await(); } for (int i = 1; i <= 5; i++){ System.out.println(Thread.currentThread().getName() + " " + i); } number = 1; conditionA.signal(); } catch (InterruptedException e) { e.printStackTrace(); } finally { System.out.println("--------------------------------------------------"); lock.unlock(); } } public static void main(String[] args) { final AlternativePrint alternativePrint = new AlternativePrint(); new Thread("A"){ @Override public void run() { for (int i= 0; i < 20; i++) alternativePrint.loopA(); } }.start(); new Thread("B"){ @Override public void run() { for (int i= 0; i < 20; i++) alternativePrint.loopB(); } }.start(); new Thread("C"){ @Override public void run() { for (int i= 0; i < 20; i++) alternativePrint.loopC(); } }.start(); } }
二、多線程交替打印10次abc實例
效果展示:
A 1
B 1
C 1
-----------------------------------------------------------------
A 1
B 1
C 1
-----------------------------------------------------------------
代碼實現:
import java.util.concurrent.locks.Condition; import java.util.concurrent.locks.ReentrantLock; public class AlternativePrint { private ReentrantLock lock = new ReentrantLock(); private Condition conditionA = lock.newCondition(); private Condition conditionB = lock.newCondition(); private Condition conditionC = lock.newCondition(); private int number = 1; public void loopA(){ lock.lock(); try { if (number != 1){ conditionA.await(); } for (int i = 1; i <= 1; i++){ System.out.println(Thread.currentThread().getName() + " " + i); } number = 2; conditionB.signal(); } catch (InterruptedException e) { e.printStackTrace(); } finally { lock.unlock(); } } public void loopB(){ lock.lock(); try { if (number != 2){ conditionB.await(); } for (int i = 1; i <= 1; i++){ System.out.println(Thread.currentThread().getName() + " " + i); } number = 3; conditionC.signal(); } catch (InterruptedException e) { e.printStackTrace(); } finally { lock.unlock(); } } public void loopC(){ lock.lock(); try { if (number != 3){ conditionC.await(); } for (int i = 1; i <= 1; i++){ System.out.println(Thread.currentThread().getName() + " " + i); } number = 1; conditionA.signal(); } catch (InterruptedException e) { e.printStackTrace(); } finally { System.out.println("-----------------------------------------------"); lock.unlock(); } } public static void main(String[] args) { final AlternativePrint alternativePrint = new AlternativePrint(); new Thread("A"){ @Override public void run() { for (int i= 0; i < 20; i++) alternativePrint.loopA(); } }.start(); new Thread("B"){ @Override public void run() { for (int i= 0; i < 20; i++) alternativePrint.loopB(); } }.start(); new Thread("C"){ @Override public void run() { for (int i= 0; i < 20; i++) alternativePrint.loopC(); } }.start(); } }
多線程按序交替打印