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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Annotations and JDBC | - Connect to databases using JDBC - Use built-in and custom annotations - Execute SQL operations and process results |
| Topic 2: Object-Oriented Programming | - Apply inheritance and polymorphism - Create and use classes, interfaces, enums, and records - Implement encapsulation and abstraction |
| Topic 3: Functional Programming | - Work with functional interfaces - Use lambda expressions and method references - Process data using Stream API |
| Topic 4: Java I/O and NIO | - Read and write files - Use Path, Files, and related APIs - Process file system resources |
| Topic 5: Collections and Generics | - Apply generics and bounded types - Use sequenced collections and maps - Use List, Set, Map, Queue, and Deque implementations |
| Topic 6: 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 7: Controlling Program Flow | - Work with records and sealed classes - Apply decision statements and loops - Use switch expressions and pattern matching |
| Topic 8: Java Concurrency | - Create and manage threads - Work with concurrent collections and executors - Use virtual threads |
| Topic 9: Modules and Packaging | - Manage dependencies and exports - Package and deploy applications - Create and use Java modules |
| Topic 10: Exception Handling | - Use try-with-resources - Create custom exceptions - Handle checked and unchecked exceptions |
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
Map<String, Integer> map = Map.of("b", 1, "a", 3, "c", 2);
TreeMap<String, Integer> treeMap = new TreeMap<>(map);
System.out.println(treeMap);
What is the output of the given code fragment?
- A. {c=2, a=3, b=1}
- B. {a=3, b=1, c=2}
- C. Compilation fails
- D. {c=1, b=2, a=3}
- E. {a=1, b=2, c=3}
- F. {b=1, a=3, c=2}
- G. {b=1, c=2, a=3}
Explanation: Only visible for TestPassKing members. You can sign-up / login (it's free).
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 a double with value: 42
- C. It's a string with value: 42
- D. null
- E. It's an integer with value: 42
- F. It throws an exception at runtime.
Explanation: Only visible for TestPassKing members. You can sign-up / login (it's free).
Given:
java
var ceo = new HashMap<>();
ceo.put("Sundar Pichai", "Google");
ceo.put("Tim Cook", "Apple");
ceo.put("Mark Zuckerberg", "Meta");
ceo.put("Andy Jassy", "Amazon");
Does the code compile?
- A. True
- B. False
Explanation: Only visible for TestPassKing members. You can sign-up / login (it's free).
Which of the following doesnotexist?
- A. Supplier<T>
- B. DoubleSupplier
- C. BiSupplier<T, U, R>
- D. LongSupplier
- E. They all exist.
- F. BooleanSupplier
Explanation: Only visible for TestPassKing members. You can sign-up / login (it's free).
Given:
java
public class BoomBoom implements AutoCloseable {
public static void main(String[] args) {
try (BoomBoom boomBoom = new BoomBoom()) {
System.out.print("bim ");
throw new Exception();
} catch (Exception e) {
System.out.print("boom ");
}
}
@Override
public void close() throws Exception {
System.out.print("bam ");
throw new RuntimeException();
}
}
What is printed?
- A. Compilation fails.
- B. bim bam boom
- C. bim bam followed by an exception
- D. bim boom
- E. bim boom bam
Explanation: Only visible for TestPassKing members. You can sign-up / login (it's free).
