18 Questions
Which of the following statements about constructors is correct?
Constructors cannot specify a return type.
In a class that does not explicitly declare a constructor, what type of constructor is provided by the compiler?
Default constructor
What happens in a class that declares a constructor and does not have a default constructor?
An error occurs due to missing default constructor.
When can you access the default constructor of a class?
When the class does not have any constructors declared.
Which is true about constructors compared to methods?
Constructors can be overloaded.
What happens if a class declares a constructor without specifying a return type?
The compiler adds a void return type by default.
What is the default initialization value for a boolean instance variable?
false
If a reference-type instance variable is not explicitly initialized, what value does it default to?
null
What does the statement 'double balance = 1000.53' demonstrate in Java?
Creating an object of a primitive type
In Java, local variables are initialized by default. (True/False)
False
What is used in Java to store the addresses of objects in memory?
References
When calling methods on an object, what is required in Java?
A reference to the object
What is the purpose of a constructor in Java?
To initialize instance variables of an object
How is a constructor different from a method in Java?
Constructors are used to initialize objects, methods are used to perform actions.
What is true about the declaration of a constructor in Java?
A constructor can have a different name than the class.
Why do primitive-type variables in Java cannot be used to call methods?
Primitive-type variables do not belong to any class.
When an object of class Account is created, what is the default initial value for the instance variable name?
What should you provide if you want to initialize an object of a class with specific values in Java?
.Constructor with parameters
Understand the concept of constructors in Java, specifically how constructors cannot return values and the difference between constructors and methods. Learn about public and private constructors, as well as default constructors in Java.
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