Difference Between final finally and finalize in Java

Final class can't be inherited, final method can't be overridden and final variable value can't be changed. Finally is used to place important code, it will be executed whether exception is handled or not. Finalize is used to perform clean up processing just before object is garbage collected.

1. What is finalize () in Java?
2. What is difference between final and static?
3. What purpose do the keywords final finally and finalize fulfill?
4. What is difference between throw and throws?
5. Is finalize always called?
6. Can we override Finalize method?
7. Can a constructor be final?
8. Is const the same as final?
9. Can we have a static & final method?
10. What is the function of finally?
11. When finally block is executed?
12. Why finally block is used in Java?

What is finalize () in Java?

The java. lang. Object. finalize() is called by the garbage collector on an object when garbage collection determines that there are no more references to the object. A subclass overrides the finalize method to dispose of system resources or to perform other cleanup.

What is difference between final and static?

The main difference between a static and final keyword is that static is keyword is used to define the class member that can be used independently of any object of that class. Final keyword is used to declare, a constant variable, a method which can not be overridden and a class that can not be inherited.

What purpose do the keywords final finally and finalize fulfill?

The final keyword is used to declare constants. final int FILE_TYPE = 3; The finally keyword is used in a try catch statement to specify a block of code to execute regardless of thrown exceptions. And finally (haha), finalize im not entirely sure is a keyword, but there is a finalize() function in the Object class.

What is difference between throw and throws?

Throw is a keyword which is used to throw an exception explicitly in the program inside a function or inside a block of code. Throws is a keyword used in the method signature used to declare an exception which might get thrown by the function while executing the code.

Is finalize always called?

The finalize method will be called after the GC detects that the object is no longer reachable, and before it actually reclaims the memory used by the object. If an object never becomes unreachable, finalize() will never be called on it. If the GC doesn't run then finalize() may never be called.

Can we override Finalize method?

The purpose of a finalize() method can be overridden for an object to include the cleanup code or to dispose of the system resources that can be done before the object is garbage collected. ... The finalize() method can be invoked only once by the JVM or any given object.

Can a constructor be final?

No, a constructor can't be made final. A final method cannot be overridden by any subclasses. ... But, in inheritance sub class inherits the members of a super class except constructors. In other words, constructors cannot be inherited in Java therefore, there is no need to write final before constructors.

Is const the same as final?

A const object can only call const methods, and is generally considered immutable. A final object cannot be set to a new object, but it is not immutable - there is nothing stopping someone from calling any set methods. ... When the variable is a primitive type, final / const work the same.

Can we have a static & final method?

Static methods belong to the class, not the instance. ... Static methods with the same signature from the parent class are hidden when called from an instance of the subclass. However, you can't override/hide final methods. You would think the error message would use the word hidden instead of overridden...

What is the function of finally?

finally() The finally() method returns a Promise . When the promise is settled, i.e either fulfilled or rejected, the specified callback function is executed. This provides a way for code to be run whether the promise was fulfilled successfully or rejected once the Promise has been dealt with.

When finally block is executed?

The finally block always executes when the try block exits. This ensures that the finally block is executed even if an unexpected exception occurs.

Why finally block is used in Java?

Java finally block is a block that is used to execute important code such as closing connection, stream etc. Java finally block is always executed whether exception is handled or not. Java finally block follows try or catch block.