13 Method getInstance2 = class2.getDeclaredMethod("getInstance"); 14 15 Object a = getInstance1.invoke(null); 16 Object b = getInstance2.invoke(null); 17 18 assertEquals(a, b); 19 } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. Java中一个...
System.out.println("In synchronized method"); } public void syncBlock() { synchronized (this) { // 同步代码块 System.out.println("In synchronized block"); } } } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. ReentrantLock 使用示例: import java.util.concurrent.locks.ReentrantLock...
2.1 底层实现 Synchronize是Java的关键字,ReentrantLock是Java类。因此,Synchronize是JVM层面语法层面的同步锁,ReentrantLock是API层面的同步锁 2.2 锁的用法 设置锁和释放锁:Synchroinze是自动加锁和释放锁的,ReentrantLock设置和释放都需要手动操作; 修饰的对象:Synchroinze可以修饰方法和代码块,ReentrantLock只能修饰代码块 ...
That's all abouthow do you synchronize HashMap in Java.Collections.synchronizedMap()is a useful method to achieve this but you also have better options available in Java. For example, if you know from the start that your HashMap will be shared between multiple threads then why not useConcurr...
util.*; import java.util.concurrent.*; public class SynchronizeArrayList { public static void main(String[] args) { // CopyOnWriteArrayList Declaration CopyOnWriteArrayList < Integer > cowal = new CopyOnWriteArrayList < Integer > (); // By using add() method to add few elements in // ...
* @author ylg * */public class SyncDemo4 { public static void main(String[] args) { final Boo b = new Boo(); Thread t1 = new Thread(){ public void run(){ b.methodA(); } }; Thread t2 = new Thread(){ public void run(){ b.methodB(); } }; t1.start(); t2.start();...
IJavaPeerable IJniNameProviderAttribute JavaArray<T> JavaBooleanArray JavaCharArray JavaDoubleArray JavaException JavaInt16Array JavaInt32Array JavaInt64Array JavaInterfaceDefaultMethodAttribute JavaLibraryReferenceAttribute JavaObject JavaObjectArray<T> JavaObjectExtensions JavaPeerableExtensions JavaPrimitiveArray...
publicclassLockExample{// 创建锁对象privatefinalReentrantLocklock=newReentrantLock();publicvoidmethod(){// 加锁操作lock.lock();try{// ...}finally{// 释放锁lock.unlock();}}} 2.3 锁的特点 ReentrantLock相比于Synchronize,有以下特点: 响应中断:ReentrantLock可以响应中断,也就是在其他线程阻塞期间,可以在...
In this example we are usingCollections.synchronizedList()method. The important point to note here is that iterator should be in synchronized block in this type of synchronization as shown in the below example. packagebeginnersbook.com;importjava.util.ArrayList;importjava.util.Iterator;importjava.util...
SynchronizeMethodCountingProcessor: ...publicsynchronizedvoidprocess(){doProcess();count++;}... 这样子固然可以解决问题,但是我们其实没必要对整个函数都进行同步,这样会影响程序的吞吐量,我们只需要在计数器加一的过程进行同步就好了,由此我们写出第二种synchronize的版本,也就是synchronize代码块: ...