Replacing Singleton class with Synchronized behaviour

[Ravi Kiran Va]

Hi ,

Can anybody please tell me

What s the need of creating Singleton classes , cant we achive the same thing using a Synchronized method ??
Sorry if its a dump question , but help me in knowing the answer .

Thanks .

[Christophe Verré]

You are comparing carrots and chickens here Singleton serve one purpose, which is basically to hold a single instance of an object. Concurrency issues have to be taken into consideration if many threads access a Singleton. A synchronized method does something, anything, and prevent multiple threads to execute it at the same time. You may have some synchronized methods in a singleton, to prevent concurrency issues mentioned previously.

[Ravi Kiran Va]

The reason why i posted this question is taht , we basically create a Singleton class as we want a Single Point of Entry in the Application .

Singleton class for Single point of Entry in the Application .

Synchronized methods in a class : Single point of Entry in the class itself


Later after your response , it was like comparing carrots and chickens

Thanks .

[Jim Hoglund]

Use a singleton to assure one point of entry. Then add synchronization to
enforce "single-file" access to its behavior (by multiple threads).

Jim ... ...

[Muhammad Khojaye]

Ravi Kiran V wrote:
Synchronized methods in a class : Single point of Entry in the class itself

Also search for static holder idiom, which is an efficient way to implement singleton.