multithreading - Simultaneous access to a Java synchronized block using threads? -

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how can 2 threads access synchronized block simultaneously? is, how can make 1 thread give chance other thread execute synchronized block, before thread finishes execution of same synchronized block?

see wait(), notify(), , notifyall().

edit: edit question incorrect. sleep() method not release monitor.

for example:

private static final object lock = new object();  public static void main(string[] args) {     executorservice executorservice = executors.newfixedthreadpool(2);     executorservice.execute(new one());     executorservice.execute(new two()); }  static class 1 implements runnable {     @override     public void run() {         synchronized (lock) {             system.out.println("(one) own lock");             system.out.println("(one) giving lock , waiting");             try {                 lock.wait();             } catch (interruptedexception e) {                 system.err.println("(one) shouldn't have been interrupted");             }             system.out.println("(one) have lock now");         }     } }  static class 2 implements runnable {     @override     public void run() {         try {             thread.sleep(100);         } catch (interruptedexception e) {             system.err.println("(two) shouldn't have been interrupted");         }         synchronized (lock) {             system.out.println("(two) own lock (two)");             system.out.println("(two) giving lock using notify()");             lock.notify();         }     } }

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