If I synchronized two methods on the same class, can they run simultaneously on the same object? For example: class A { public synchronized void methodA() { //method A } public synchronized void methodB() { // method B } } I know that I can’t run methodA() twice on same object in two different threads. … Read more
In Java 8, I can easily write: interface Interface1 { default void method1() { synchronized (this) { // Something } } static void method2() { synchronized (Interface1.class) { // Something } } } I will get the full synchronisation semantics that I can use also in classes. I cannot, however, use the synchronized modifier on … Read more
If I have 2 synchronized methods in the same class, but each accessing different variables, can 2 threads access those 2 methods at the same time? Does the lock occur on the object, or does it get as specific as the variables inside the synchronized method? Example: class X { private int a; private int … Read more
I am wondering at the difference between declaring a variable as volatile and always accessing the variable in a synchronized(this) block in Java? According to this article http://www.javamex.com/tutorials/synchronization_volatile.shtml there is a lot to be said and there are many differences but also some similarities. I am particularly interested in this piece of info: … access … Read more
Whenever a question pops up on SO about Java synchronization, some people are very eager to point out that synchronized(this) should be avoided. Instead, they claim, a lock on a private reference is to be preferred. Some of the given reasons are: some evil code may steal your lock (very popular this one, also has … Read more
Can any one tell me the advantage of synchronized method over synchronized block with an example? 23 Answers 23
I have some questions regarding the usage and significance of the synchronized keyword. What is the significance of the synchronized keyword? When should methods be synchronized? What does it mean programmatically and logically? 17 s 17 The synchronized keyword is all about different threads reading and writing to the same variables, objects and resources. This … Read more
