In Java, when an exception is thrown in a try block and caught in a catch block, if the catch block also throws an exception, what happens to the original exception?

The correct answer is C: The original exception is stored in the cause field if exception chaining is used. When exception chaining is explicitly used with initCause() or constructor parameters, the original exception becomes the cause of the new exception. Without explicit chaining, the original exception is lost. Exception chaining is not automatic in Java.

What is the return type of the lambda expression: (a, b) -> a > b?

The correct answer is B: boolean. The expression uses comparison operator (>), which returns a boolean value.

Consider: Function curry = x -> y -> x + y; What does curry.apply(5).apply(3) return?

The correct answer is A: 8. This is a curried function. curry.apply(5) returns a function that adds 5. Applying that with 3 gives 5 + 3 = 8.

When deserializing an object, which methods are called in order?

The correct answer is B: readObject() only, constructor is not called. During deserialization, the constructor is NOT called. readObject() restores the object state directly from the serialized data. This is why transient fields need special handling.

What is the main difference between method overriding and method overloading?

The correct answer is C: Overriding is runtime polymorphism, overloading is compile-time polymorphism. Method overloading is compile-time (static) polymorphism with same method name but different parameters in the same class. Method overriding is runtime (dynamic) polymorphism where a child class provides a specific implementation of a parent method.

Home

Home › Subjects › Java Programming

Java Programming

Java OOP, collections, multithreading

476 Q 10 Topics Take Mock Test

Difficulty: All Easy Medium Hard 461–470 of 476

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.461 Medium Basics & Syntax

What is the output of: System.out.println("5" + 3 + 2);

A 10

B 532

C Error

D 7

Correct Answer: B. 532

EXPLANATION

String concatenation: "5" + 3 becomes "53", then "53" + 2 becomes "532". Once a String is involved, + performs concatenation.

Test

Q.462 Medium Basics & Syntax

What is the output of: System.out.println(10 * 2 / 5 * 2);

A 8

B 4

C 16

D 2

Correct Answer: A. 8

EXPLANATION

Operators *, / have same precedence and are evaluated left to right: ((10 * 2) / 5) * 2 = (20 / 5) * 2 = 4 * 2 = 8.

Test

Q.463 Medium Basics & Syntax

Which of the following statements will compile successfully?

A byte b = 300;

B byte b = (byte) 300;

C int i = 'a';

D Both B and C

Correct Answer: D. Both B and C

EXPLANATION

Option A fails (300 exceeds byte range). Option B works with explicit casting. Option C works (char to int conversion is implicit).

Test

Q.464 Medium Basics & Syntax

What is the result of: System.out.println(true && false || true);

A true

B false

C Error

D null

Correct Answer: A. true

EXPLANATION

&& has higher precedence than ||. So: (true && false) || true = false || true = true.

Test

Q.465 Medium Basics & Syntax

Which of the following correctly represents a long literal in Java?

A long num = 1000000;

B long num = 1000000L;

C long num = 1000000l;

D Both B and C

Correct Answer: D. Both B and C

EXPLANATION

Both 'L' and 'l' suffixes are valid for long literals in Java, though 'L' is preferred as it's less confusing with '1'.

Test

Q.466 Medium Basics & Syntax

What is the output of: int x = 5; System.out.println(++x + x++);

A 11

B 12

C 10

D 13

Correct Answer: B. 12

EXPLANATION

++x increments x to 6 and uses it, then x++ uses 6 and increments to 7. So 6 + 6 = 12.

Test

Q.467 Medium Basics & Syntax

What will be the output: System.out.println('A' + 'B');

A AB

B 131

C Error

D 2

Correct Answer: B. 131

EXPLANATION

Characters are treated as their ASCII values in arithmetic operations. 'A' (65) + 'B' (66) = 131.

Test

Q.468 Medium Basics & Syntax

Which of the following is the correct way to declare and initialize an array in Java?

A int array[5] = {1, 2, 3, 4, 5};

B int[] array = {1, 2, 3, 4, 5};

C int array = [1, 2, 3, 4, 5];

D array[5] int = {1, 2, 3, 4, 5};

Correct Answer: B. int[] array = {1, 2, 3, 4, 5};

EXPLANATION

The correct syntax is 'datatype[] arrayName = {elements};' or 'datatype[] arrayName = new datatype[size];'

Test

Q.469 Medium Basics & Syntax

Identify the output: System.out.println("Java".length());

A 4

B 5

C Compilation error

D null

Correct Answer: A. 4

EXPLANATION

The length() method returns the number of characters in the string "Java", which is 4 characters.

Test

Q.470 Medium Basics & Syntax

Which statement is correct about Java variables?

A Variable names are case-sensitive

B Variable names can start with a digit

C Variable names can contain spaces

D Variable names can use special characters like @, #

Correct Answer: A. Variable names are case-sensitive

EXPLANATION

Java variable names are case-sensitive. 'age' and 'Age' are different variables. Names cannot start with digits, cannot contain spaces, and special characters are not allowed.

Test

1…45 46 47 48

All Subjects & Topics

Govt. Exams

Entrance Exams

Teacher Exams

Subjects

Quick Links

Java Programming