69 lines
2.1 KiB
Java
69 lines
2.1 KiB
Java
package bunny.thread;
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import java.util.concurrent.locks.ReentrantLock;
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public class ThreadTest3 {
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private static int count = 0;
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private static Integer threadCount = 0;
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private static Integer lockCount = 0;
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private static Integer lockReentrantLockCount = 0;
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private static final Object lockObject = new Object();
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private static final ReentrantLock lock = new ReentrantLock();
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/**
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* * 资源竞争代码示例
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*/
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public static void main(String[] args) {
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// 这是单线程下没有竞争的示例
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for (int i = 0; i < 10; i++) {
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for (int j = 0; j < 1000; j++) {
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count++;
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}
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}
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// 有资源竞争，值不确定是多少，每一次运行都不一样
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for (int i = 0; i < 10; i++) {
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new Thread(() -> {
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for (int j = 0; j < 1000; j++) {
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threadCount++;
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}
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}).start();
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}
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// 使用对象锁解决这个问题
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for (int i = 0; i < 10; i++) {
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new Thread(() -> {
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synchronized (lockObject) {
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for (int j = 0; j < 1000; j++) {
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lockCount++;
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}
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}
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}).start();
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}
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// 使用锁解决
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for (int i = 0; i < 10; i++) {
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new Thread(() -> {
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lock.lock();
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try {
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for (int j = 0; j < 1000; j++) {
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lockReentrantLockCount++;
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}
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} finally {
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lock.unlock();
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}
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}).start();
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}
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try {
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Thread.sleep(1000);
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} catch (InterruptedException e) {
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System.out.println(e.getMessage());
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}
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System.out.println("count 值：" + count);
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System.out.println("threadCount 值：" + threadCount);
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System.out.println("lockCount 值：" + lockCount);
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System.out.println("lockReentrantLockCount 值：" + lockReentrantLockCount);
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}
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}
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