Abstract Synchronized

[James Tharakan]

Why we cannot declare a method as abstract and synchronized?

[Omar Al Kababji]

because its better not to do it since its better to synchronize your code at block levels instead of making the whole method as synchronized, however note that when you define a concrete implmentation of the method you can specify that its synchronized.

(peace)

[Ankit Garg]

Just to make it more clear, if you have an abstract method, then while overriding you can add the synchronized keyword to the method. And if a method is synchronized (non-abstract method of course), then while overriding it, you can remove the synchronized keyword. So there's no point in making an abstract method synchronized as the overriding code can add or remove the synchronized keyword on will. This behavior of the synchronized keyword is because synchronized is not a part of method signature...

[Prav sharma]

Rightly said. SYnchronised is not a part of the method signature.

[Jesper de Jong]

Whether a method needs to be synchronized or not, depends on how that method is implemented.

Since an abstract method has no implementation at all, it doesn't make sense to make it synchronized.