18 Questions
What is the default value of a local variable inside a method in Java?
No default value
What happens to the object previously referenced by c1 after the assignment c1 = c2?
It is no longer referenced
What is the default value of a data field of a reference type?
null
What is the default value of a char type data field?
'\u0000'
What happens when a data field of a reference type does not reference any object?
It holds the value null
What is the default value of a boolean type data field?
false
What is the correct way to invoke a non-static method in Java?
Using an object reference variable, such as myCircle.getArea()
What is the default value of the boolean data field isScienceMajor in the Student class?
False
What is the correct way to invoke a method in the Math class?
Using the class name, such as Math.getArea()
What is the data type of the data field name in the Student class?
String
What is the default value of the char data field gender in the Student class?
''
Can you invoke a non-static method using the class name?
No, never
What is the primary motivation for using object-oriented programming?
To develop graphical user interfaces and large scale software systems
What defines the identity of an object?
Its unique identity
What is a class in object-oriented programming?
A construct that defines objects of the same type
What is the state of an object composed of?
A set of data fields with their current values
What is the behavior of an object defined by?
A set of methods
What are objects in object-oriented programming?
Entities in the real world that can be distinctly identified
Learn about the default values of different data types in Java, including null, numeric, boolean, and char types. Understand how Java assigns default values to data fields and local variables.
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