Methods

Question 1

What is the initialization order of a class?

Answer 1

1. Static statements/blocks in the order they were defined.
2. Instance initializer statements in the order defined.
3. Constructor.

Question 2

When is a method considered to be overloaded?

Answer 2

When it has the same name as a parent class method but different parameters.

Question 3

Is the following valid syntax for a method?

return this(a, b, c);

Answer 3

No.

This is valid syntax for a constructor.

Question 4

T/F: You cannot override the toString( ) method of the Object class.

Answer 4

False.

You sure can. The method toString( ) is defined as public and non-final in the Object class.

Question 5

Can static methods be accessed by the non-static keyword this?

Answer 5

Yes. Static methods can be accessed via static and non-static methods.

Question 6

What does the toString( ) method of the Object class return?

Answer 6

It returns the name of the class of which the object is an instance, the at-sign character ‘@’, and the unsigned hexadecimal representation of the hash code of the object.

Question 7

What is the reference type of the following code?

List list = new ArrayList( );

Answer 7

The reference type is ArrayList.

Question 8

What is the object type of the following declaration?

List list = new ArrayList( );

Answer 8

The object type is List.