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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Java Concurrency | - Work with concurrent collections and executors - Use virtual threads - Create and manage threads |
| Topic 2: Functional Programming | - Process data using Stream API - Use lambda expressions and method references - Work with functional interfaces |
| Topic 3: Handling Date, Time, Text, Numeric and Boolean Values | - Use date, time, duration, period, and localization APIs - Use String, StringBuilder, and related APIs - Work with primitive wrappers and number formatting |
| Topic 4: Modules and Packaging | - Create and use Java modules - Package and deploy applications - Manage dependencies and exports |
| Topic 5: Controlling Program Flow | - Apply decision statements and loops - Work with records and sealed classes - Use switch expressions and pattern matching |
| Topic 6: Collections and Generics | - Use List, Set, Map, Queue, and Deque implementations - Use sequenced collections and maps - Apply generics and bounded types |
| Topic 7: Object-Oriented Programming | - Implement encapsulation and abstraction - Create and use classes, interfaces, enums, and records - Apply inheritance and polymorphism |
| Topic 8: Annotations and JDBC | - Use built-in and custom annotations - Execute SQL operations and process results - Connect to databases using JDBC |
| Topic 9: Java I/O and NIO | - Use Path, Files, and related APIs - Read and write files - Process file system resources |
| Topic 10: Exception Handling | - Use try-with-resources - Create custom exceptions - Handle checked and unchecked exceptions |
Oracle Java SE 21 Developer Professional Sample Questions:
1. Which of the following can be the body of a lambda expression?
A) None of the above
B) Two expressions
C) Two statements
D) A statement block
E) An expression and a statement
2. Given:
var cabarets = new TreeMap<>();
cabarets.put(1, "Moulin Rouge");
cabarets.put(2, "Crazy Horse");
cabarets.put(3, "Paradis Latin");
cabarets.put(4, "Le Lido");
cabarets.put(5, "Folies Bergere");
System.out.println(cabarets.subMap(2, true, 5, false));
What is printed?
A) An exception is thrown at runtime.
B) Compilation fails.
C) CopyEdit{2=Crazy Horse, 3=Paradis Latin, 4=Le Lido, 5=Folies Bergere}
D) {2=Crazy Horse, 3=Paradis Latin, 4=Le Lido}
E) {}
3. Given:
java
List<String> abc = List.of("a", "b", "c");
abc.stream()
.forEach(x -> {
x = x.toUpperCase();
});
abc.stream()
.forEach(System.out::print);
What is the output?
A) ABC
B) abc
C) Compilation fails.
D) An exception is thrown.
4. Given:
java
ExecutorService service = Executors.newFixedThreadPool(2);
Runnable task = () -> System.out.println("Task is complete");
service.submit(task);
service.shutdown();
service.submit(task);
What happens when executing the given code fragment?
A) It exits normally without printing anything to the console.
B) It prints "Task is complete" once, then exits normally.
C) It prints "Task is complete" twice and throws an exception.
D) It prints "Task is complete" once and throws an exception.
E) It prints "Task is complete" twice, then exits normally.
5. Given:
java
DoubleStream doubleStream = DoubleStream.of(3.3, 4, 5.25, 6.66);
Predicate<Double> doublePredicate = d -> d < 5;
System.out.println(doubleStream.anyMatch(doublePredicate));
What is printed?
A) false
B) 3.3
C) Compilation fails
D) true
E) An exception is thrown at runtime
Solutions:
| Question # 1 Answer: D | Question # 2 Answer: D | Question # 3 Answer: B | Question # 4 Answer: D | Question # 5 Answer: C |
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