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| Section | Objectives |
|---|---|
| Topic 1: Functional Programming | - Use lambda expressions and method references - Work with functional interfaces - Process data using Stream API |
| Topic 2: Handling Date, Time, Text, Numeric and Boolean Values | - Use String, StringBuilder, and related APIs - Work with primitive wrappers and number formatting - Use date, time, duration, period, and localization APIs |
| Topic 3: Controlling Program Flow | - Apply decision statements and loops - Work with records and sealed classes - Use switch expressions and pattern matching |
| Topic 4: Exception Handling | - Handle checked and unchecked exceptions - Use try-with-resources - Create custom exceptions |
| Topic 5: Java Concurrency | - Work with concurrent collections and executors - Use virtual threads - Create and manage threads |
| Topic 6: Collections and Generics | - Use List, Set, Map, Queue, and Deque implementations - Apply generics and bounded types - Use sequenced collections and maps |
| Topic 7: Java I/O and NIO | - Read and write files - Use Path, Files, and related APIs - Process file system resources |
| Topic 8: Object-Oriented Programming | - Implement encapsulation and abstraction - Create and use classes, interfaces, enums, and records - Apply inheritance and polymorphism |
| Topic 9: Annotations and JDBC | - Use built-in and custom annotations - Connect to databases using JDBC - Execute SQL operations and process results |
| Topic 10: Modules and Packaging | - Package and deploy applications - Manage dependencies and exports - Create and use Java modules |
Given:
java
var now = LocalDate.now();
var format1 = new DateTimeFormatter(ISO_WEEK_DATE);
var format2 = DateTimeFormatter.ISO_WEEK_DATE;
var format3 = new DateFormat(WEEK_OF_YEAR_FIELD);
var format4 = DateFormat.getDateInstance(WEEK_OF_YEAR_FIELD);
System.out.println(now.format(REPLACE_HERE));
Which variable prints 2025-W01-2 (present-day is 12/31/2024)?
Correct Answer: C 🗳️
Explanation: Only visible for TestkingPass members. You can sign-up / login (it's free).
Given:
java
public class Test {
static int count;
synchronized Test() {
count++;
}
public static void main(String[] args) throws InterruptedException {
Runnable task = Test::new;
Thread t1 = new Thread(task);
Thread t2 = new Thread(task);
t1.start();
t2.start();
t1.join();
t2.join();
System.out.println(count);
}
}
What is the given program's output?
Correct Answer: D 🗳️
Explanation: Only visible for TestkingPass members. You can sign-up / login (it's free).
Given:
java
int post = 5;
int pre = 5;
int postResult = post++ + 10;
int preResult = ++pre + 10;
System.out.println("postResult: " + postResult +
", preResult: " + preResult +
", Final value of post: " + post +
", Final value of pre: " + pre);
What is printed?
Correct Answer: A 🗳️
Explanation: Only visible for TestkingPass members. You can sign-up / login (it's free).
Which StringBuilder variable fails to compile?
java
public class StringBuilderInstantiations {
public static void main(String[] args) {
var stringBuilder1 = new StringBuilder();
var stringBuilder2 = new StringBuilder(10);
var stringBuilder3 = new StringBuilder("Java");
var stringBuilder4 = new StringBuilder(new char[]{'J', 'a', 'v', 'a'});
}
}
Correct Answer: D 🗳️
Explanation: Only visible for TestkingPass members. You can sign-up / login (it's free).
Given:
java
Optional o1 = Optional.empty();
Optional o2 = Optional.of(1);
Optional o3 = Stream.of(o1, o2)
.filter(Optional::isPresent)
.findAny()
.flatMap(o -> o);
System.out.println(o3.orElse(2));
What is the given code fragment's output?
Correct Answer: D 🗳️
Explanation: Only visible for TestkingPass members. You can sign-up / login (it's free).
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