
Mastering Java Concepts
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Other
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University
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Practice Problem
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Hard
kanakam satya
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20 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What are the four main principles of Object-Oriented Programming?
Inheritance, Composition, Encapsulation, Serialization
Polymorphism, Abstraction, Data Hiding, Class
Encapsulation, Abstraction, Inheritance, Polymorphism
Composition, Aggregation, Delegation, Interface
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Explain the concept of inheritance in Java.
Inheritance in Java is used to delete properties from a class.
Inheritance in Java allows a class to inherit properties and behaviors (methods) from another class, promoting code reuse and establishing a hierarchical relationship.
Inheritance in Java is a way to create multiple classes with no relationship.
Inheritance allows a class to override all methods of its parent class without restrictions.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is polymorphism and how is it implemented in Java?
Polymorphism is only achieved through inheritance in Java.
Polymorphism can only be implemented using abstract classes in Java.
Polymorphism is a feature exclusive to C++ and not applicable in Java.
Polymorphism in Java is implemented through method overriding and interfaces.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Define encapsulation and provide an example in Java.
class Person { private String name; public String getName() { return null; } }
class Person { public String name; }
class Person { private String name; public void displayName() { System.out.println(name); } }
Example in Java: class Person { private String name; public String getName() { return name; } public void setName(String name) { this.name = name; } }
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is an interface in Java and how does it differ from an abstract class?
An interface defines a contract for classes to implement, while an abstract class can provide some method implementations and state.
An interface can have instance variables, while an abstract class cannot.
An interface is a type of class that cannot be instantiated, while an abstract class can be instantiated.
An interface can only contain static methods, while an abstract class can contain instance methods.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do you handle exceptions in Java?
Use if-else statements to handle exceptions in Java.
Throw exceptions without handling them.
Use try-catch blocks to handle exceptions in Java.
Ignore exceptions and continue execution.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the purpose of the try-catch block in Java?
To optimize memory usage.
To improve code readability.
To define variables in a method.
To handle exceptions and prevent program crashes.
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