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Java Polymorphism and Packages
Question 1
What is the key difference between compile-time and runtime polymorphism in Java?
Compile-time polymorphism is implemented using method overriding, while runtime polymorphism is implemented using method overloading.
Compile-time polymorphism is determined during compilation, while runtime polymorphism is resolved at runtime.
Runtime polymorphism is faster than compile-time polymorphism.
Compile-time polymorphism is achieved using interfaces.
Question 2
What is the primary use of packages in Java?
To group related classes together.
To speed up Java execution.
To enable multiple inheritance.
To improve memory allocation.
Question 3
What will happen if two classes in different packages have the same name and are imported in a Java file?
Compilation error due to ambiguity.
The last imported class is used.
The first imported class is used.
Java automatically renames one class.
Question 4
Which access modifier allows a member to be accessible within the same package but not from outside?
private
protected
default
public
Question 5
What will be the output of the following program?
package pack1;
public class A {
public void display() {
System.out.println("Hello from A");
}
}
package pack2;
import pack1.A;
public class B {
public static void main(String args[]) {
A obj = new A();
obj.display();
}
}
Compilation error
Hello from A
Runtime error
No output
Question 6
Which type of polymorphism is achieved through method overloading?
Compile-time
Runtime
Dynamic
Static binding
Question 7
Which of the following allows method overriding in Java?
Static methods
Final methods
Instance methods
Private methods
There are 8 questions to complete.