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使用Condition对象可以对线程执行的业务进行排序规划。
package org.test.t9.t_3;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.ReentrantLock;
public class Run {
volatile private static int nextPrintWho = 1;
private static ReentrantLock lock = new ReentrantLock();
final private static Condition conditionA = lock.newCondition();
final private static Condition conditionB = lock.newCondition();
final private static Condition conditionC = lock.newCondition();
public static void main(String[] args) {
Thread threadA = new Thread(){
public void run() {
try {
lock.lock();
while(nextPrintWho != 1) {
conditionA.await();
}
for (int i = 0; i < 3; i++) {
System.out.println("ThreadA " + (i + 1));
}
nextPrintWho = 2;
conditionB.signalAll();
} catch (InterruptedException e) {
e.printStackTrace();
}finally{
lock.unlock();
}
};
};
Thread threadB = new Thread(){
public void run() {
try {
lock.lock();
while(nextPrintWho != 2) {
conditionB.await();
}
for (int i = 0; i < 3; i++) {
System.out.println("ThreadB " + (i + 1));
}
nextPrintWho = 3;
conditionC.signalAll();
} catch (InterruptedException e) {
e.printStackTrace();
}finally{
lock.unlock();
}
};
};
Thread threadC = new Thread(){
public void run() {
try {
lock.lock();
while(nextPrintWho != 3) {
conditionC.await();
}
for (int i = 0; i < 3; i++) {
System.out.println("ThreadC " + (i + 1));
}
nextPrintWho = 1;
conditionA.signalAll();
} catch (InterruptedException e) {
e.printStackTrace();
}finally{
lock.unlock();
}
};
};
Thread[] aArray = new Thread[5];
Thread[] bArray = new Thread[5];
Thread[] cArray = new Thread[5];
for (int i = 0; i < 5; i++) {
aArray[i] = new Thread(threadA);
bArray[i] = new Thread(threadB);
cArray[i] = new Thread(threadC);
aArray[i].start();
bArray[i].start();
cArray[i].start();
}
}
}