Consider: Function f = x -> x * x; What will f.apply(5) return?

The correct answer is A: 25. Function takes an Integer and returns an Integer. f.apply(5) computes 5 * 5 = 25.

What issue can arise when using lambda expressions with checked exceptions?

The correct answer is B: They must be wrapped in try-catch or a custom functional interface must be created. Since standard functional interfaces don't declare checked exceptions, you must either wrap in try-catch or create a custom functional interface that throws the checked exception.

Can you instantiate an interface in Java?

The correct answer is B: No, interfaces cannot be instantiated. Interfaces cannot be instantiated directly. You can only create objects of classes that implement interfaces.

Consider: class Parent { Parent() { System.out.println("P"); } } class Child extends Parent { Child() { System.out.println("C"); } } public static void main(String[] args) { new Child(); }

The correct answer is C: P C. Child constructor implicitly calls super() first, executing Parent constructor. Output: Parent prints 'P', then Child prints 'C'.

A method processes collections where items need to be added back to the same collection type. Which wildcard approach ensures type safety for write operations?

The correct answer is A: public static void addElements(List. '? super T' allows writing T instances (contravariant), while '? extends T' allows safe reading (covariant). This combination enables flexible yet type-safe collection manipulation.

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Java Programming
Exception Handling

Java OOP, collections, multithreading

51 Q 10 Topics Take Mock Test

Difficulty: All Easy Medium Hard 51–51 of 51

Topics in Java Programming

All Basics & Syntax 100 OOP in Java 100 Collections Framework 100 Multithreading 100 Exception Handling 100 I/O Streams 100 JDBC 100 Generics 100 Lambda Expressions 100 Spring Framework Basics 58

Q.51 Medium Exception Handling

What is the output of the following code?
int x = 10;
try {
x = x / 0;
} catch(ArithmeticException e) {
x = x + 5;
} finally {
x = x * 2;
}
System.out.println(x);

A 10

B 30

C 20

D 40

Correct Answer: B. 30

EXPLANATION

ArithmeticException is caught, x becomes 10+5=15. Finally block executes, x becomes 15*2=30. Finally block always executes regardless of exception.

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Java Programming Exception Handling

Java Programming
Exception Handling