What is the difference between a synchronized method and a synchronized block in Java?
What is the difference between a synchronized method and a synchronized block in Java?
Synchronized blocks provide granular control over a lock, as you can use arbitrary any lock to provide mutual exclusion to critical section code. On the other hand, the synchronized method always locks either on the current object represented by this keyword or class level lock, if it’s a static synchronized method.
What is synchronized block in Java?
A Synchronized block is a piece of code that can be used to perform synchronization on any specific resource of the method. A Synchronized block is used to lock an object for any shared resource and the scope of a synchronized block is smaller than the synchronized method.
What is a synchronized method in Java?
Java Synchronized Method Synchronized method is used to lock an object for any shared resource. When a thread invokes a synchronized method, it automatically acquires the lock for that object and releases it when the thread completes its task.
Which is more efficient synchronized block or synchronized method?
If you synchronize a code block within that method then more than one thread can execute the method simultaneously, but only one thread can enter the synchronized block at a time. From this we can conclude that synchronizing on the smallest possible code block required is the most efficient way to do it.
What is difference between synchronized and synchronized block?
A synchronized method provides a lock corresponding to object-level or Class level ( i.e class level means static method ), whereas, synchronized block provides a lock on any object depending on the parameter.
What are synchronization methods?
Synchronization methods: Overview
| Method | Complexity | Frequency used |
|---|---|---|
| Moving libraries | Low | Medium to high |
| Moving objects | Medium to high | Medium |
| Applying journaled changes | High | Low |
| Refreshing new system | Low | Low |
What is the need of synchronized block?
Synchronized block is used to lock an object for any shared resource. Scope of synchronized block is smaller than the method. A Java synchronized block doesn’t allow more than one JVM, to provide access control to a shared resource.
How do you write a synchronized block in Java?
Example of Synchronized Block
- class Table.
- {
- void printTable(int n){
- synchronized(this){//synchronized block.
- for(int i=1;i<=5;i++){
- System.out.println(n*i);
- try{
- Thread.sleep(400);
Is HashMap synchronized?
HashMap is similar to HashTable in java. The main difference between HashTable and HashMap is that HashTable is synchronized but HashMap is not synchronized.
