Last Updated: Jul 25, 2026
No. of Questions: 85 Questions & Answers with Testing Engine
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| Section | Objectives |
|---|---|
| Exception Handling and Debugging | - Error handling mechanisms
|
| Database Connectivity (JDBC) | - Database interaction
|
| Advanced Java Features (Java SE 21) | - Modern language features
|
| Java Language Fundamentals | - Java syntax and language structure
|
| Input/Output and File Handling | - NIO and file operations
|
| Object-Oriented Programming | - Core OOP principles
|
| Concurrency and Multithreading | - Thread management
|
| Core APIs | - Java standard library usage
|
1. Given:
java
void verifyNotNull(Object input) {
boolean enabled = false;
assert enabled = true;
assert enabled;
System.out.println(input.toString());
assert input != null;
}
When does the given method throw a NullPointerException?
A) Only if assertions are enabled and the input argument isn't null
B) Only if assertions are enabled and the input argument is null
C) Only if assertions are disabled and the input argument is null
D) Only if assertions are disabled and the input argument isn't null
E) A NullPointerException is never thrown
2. Given:
java
var _ = 3;
var $ = 7;
System.out.println(_ + $);
What is printed?
A) _$
B) It throws an exception.
C) Compilation fails.
D) 10
3. Given:
java
Object input = 42;
String result = switch (input) {
case String s -> "It's a string with value: " + s;
case Double d -> "It's a double with value: " + d;
case Integer i -> "It's an integer with value: " + i;
};
System.out.println(result);
What is printed?
A) Compilation fails.
B) It's an integer with value: 42
C) It's a string with value: 42
D) It throws an exception at runtime.
E) It's a double with value: 42
F) null
4. Given:
java
public class OuterClass {
String outerField = "Outer field";
class InnerClass {
void accessMembers() {
System.out.println(outerField);
}
}
public static void main(String[] args) {
System.out.println("Inner class:");
System.out.println("------------");
OuterClass outerObject = new OuterClass();
InnerClass innerObject = new InnerClass(); // n1
innerObject.accessMembers(); // n2
}
}
What is printed?
A) markdown
Inner class:
------------
Outer field
B) An exception is thrown at runtime.
C) Nothing
D) Compilation fails at line n2.
E) Compilation fails at line n1.
5. Given:
java
String textBlock = """
j \
a \t
v \s
a \
""";
System.out.println(textBlock.length());
What is the output?
A) 12
B) 11
C) 14
D) 10
Solutions:
| Question # 1 Answer: C | Question # 2 Answer: C | Question # 3 Answer: A | Question # 4 Answer: E | Question # 5 Answer: A |
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