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Initializing Objects with Constructors in Java (Account Class)

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Initializing Objects with Constructors in Java (Account Class)

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Questions and Answers

Which of the following statements about constructors is correct?

Constructors can return values just like methods.

Constructors must have a void return type.

Constructors can have a return type specified.

Constructors cannot specify a return type. (correct)

In a class that does not explicitly declare a constructor, what type of constructor is provided by the compiler?

Public constructor

Void constructor

Default constructor (correct)

Private constructor

What happens in a class that declares a constructor and does not have a default constructor?

The class cannot be instantiated.

The default constructor is added by the compiler.

The class does not need a constructor.

An error occurs due to missing default constructor. (correct)

When can you access the default constructor of a class?

When the class does not have any constructors declared. Signup and view all the answers

Which is true about constructors compared to methods?

Constructors can be overloaded. Signup and view all the answers

What happens if a class declares a constructor without specifying a return type?

The compiler adds a void return type by default. Signup and view all the answers

What is the default initialization value for a boolean instance variable?

false Signup and view all the answers

If a reference-type instance variable is not explicitly initialized, what value does it default to?

null Signup and view all the answers

What does the statement 'double balance = 1000.53' demonstrate in Java?

Creating an object of a primitive type Signup and view all the answers

In Java, local variables are initialized by default. (True/False)

False Signup and view all the answers

What is used in Java to store the addresses of objects in memory?

References Signup and view all the answers

When calling methods on an object, what is required in Java?

A reference to the object Signup and view all the answers

What is the purpose of a constructor in Java?

To initialize instance variables of an object Signup and view all the answers

How is a constructor different from a method in Java?

Constructors are used to initialize objects, methods are used to perform actions. Signup and view all the answers

What is true about the declaration of a constructor in Java?

A constructor can have a different name than the class. Signup and view all the answers

Why do primitive-type variables in Java cannot be used to call methods?

Primitive-type variables do not belong to any class. Signup and view all the answers

When an object of class Account is created, what is the default initial value for the instance variable name?

Signup and view all the answers

What should you provide if you want to initialize an object of a class with specific values in Java?

.Constructor with parameters Signup and view all the answers