15. Explain About the 'synchronized' Modifier?

Answer:
Applies to

• l Methods
• l Block of code

This controls the access to a piece of critical code in a multithreaded environment.
Note: It is illegal to have two access modifiers in a single declaration. But we can have along with access modifier, non-access modifier.

16. How we declare the java Constructors?

Answer

• In Java constructor is used to initialize the object. The name of the constructor should be same name as
• the class name.
• Constructor does not return any value, and even we cannot use void as a return type.
• When you create an instance of a class, a default constructor provided by the compiler ( i.e. no
• argument constructor).

17. What are all the method overriding conditions?

• l Must have the same method name.
• l Must have same return type.
• l Must have same argument list.

18. A static modifier is valid for?
[a] Class declarations.
[b] Class static initialization blocks.
[c] Local variables.
[d] Inner classes

Answer
[b] Class static initialization blocks.
[d] Inner classes