Java Programming True or False: All classes must explicitly define at least one

Question

Java Programming

True or False: All classes must explicitly define at least one constructor.

True or False: The “this” keyword allows you to distinguish between a method formal parameter and an instance variable used in that method that has the same name. True or False: The static modifier in Java is used to create non modifiable variables (constants).

True or False:Changing code in the implementation part of a class should not require changes in the class contract.

True or False: Methods with the private modifier cannot be called outside of the class.

True or False:The scope of a local variable ends at the bottom of the enclosing block in which it is defined.

True or False:The “new” keyword is used to instantiate activation records on the runtime stack.

True or False: A two dimensional array can have rows with different lengths.

True or False: Strings are immutable so the statement s = “Hello”; will not alter the value of the reference variable s.

True or False: Overloaded methods will have the exact same signature.

Explanation / Answer

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False: All classes must explicitly define at least one constructor.

True: The “this” keyword allows you to distinguish between a method formal parameter and an instance variable used in that method that has the same name.

True : The static modifier in Java is used to create non-modifiable variables (constants).

False: Changing code in the implementation part of a class should not require changes in the class contract.

True : Methods with the private modifier cannot be called outside of the class.

True :The scope of a local variable ends at the bottom of the enclosing block in which it is defined.

True :The “new” keyword is used to instantiate activation records on the runtime stack.

False: A two dimensional array can have rows with different lengths.

False: Strings are immutable so the statement s = “Hello”; will not alter the value of the reference variable s. // reference variable can be change

False: Overloaded methods will have the exact same signature.

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