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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Modules and Packaging | - Manage dependencies and exports - Package and deploy applications - Create and use Java modules |
| Java Concurrency | - Use virtual threads - Create and manage threads - Work with concurrent collections and executors |
| Functional Programming | - Use lambda expressions and method references - Work with functional interfaces - Process data using Stream API |
| Exception Handling | - Use try-with-resources - Handle checked and unchecked exceptions - Create custom exceptions |
| Collections and Generics | - Use sequenced collections and maps - Apply generics and bounded types - Use List, Set, Map, Queue, and Deque implementations |
| Controlling Program Flow | - Use switch expressions and pattern matching - Apply decision statements and loops - Work with records and sealed classes |
| Handling Date, Time, Text, Numeric and Boolean Values | - Work with primitive wrappers and number formatting - Use date, time, duration, period, and localization APIs - Use String, StringBuilder, and related APIs |
| Object-Oriented Programming | - Apply inheritance and polymorphism - Create and use classes, interfaces, enums, and records - Implement encapsulation and abstraction |
| Annotations and JDBC | - Use built-in and custom annotations - Execute SQL operations and process results - Connect to databases using JDBC |
| Java I/O and NIO | - Read and write files - Process file system resources - Use Path, Files, and related APIs |
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
Stream<String> strings = Stream.of("United", "States");
BinaryOperator<String> operator = (s1, s2) -> s1.concat(s2.toUpperCase()); String result = strings.reduce("-", operator); System.out.println(result); What is the output of this code fragment?
- A. UNITED-STATES
- B. -UnitedStates
- C. -UNITEDSTATES
- D. United-STATES
- E. United-States
- F. UnitedStates
- G. -UnitedSTATES
Explanation: Only visible for TestPassKing members. You can sign-up / login (it's free).
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. Compilation fails at line n1.
- B. Nothing
- C. markdown
Inner class:
------------
Outer field - D. Compilation fails at line n2.
- E. An exception is thrown at runtime.
Explanation: Only visible for TestPassKing members. You can sign-up / login (it's free).
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. Compilation fails.
- B. {}
- C. An exception is thrown at runtime.
- D. {2=Crazy Horse, 3=Paradis Latin, 4=Le Lido}
- E. CopyEdit{2=Crazy Horse, 3=Paradis Latin, 4=Le Lido, 5=Folies Bergere}
Explanation: Only visible for TestPassKing members. You can sign-up / login (it's free).
Given:
java
StringBuffer us = new StringBuffer("US");
StringBuffer uk = new StringBuffer("UK");
Stream<StringBuffer> stream = Stream.of(us, uk);
String output = stream.collect(Collectors.joining("-", "=", ""));
System.out.println(output);
What is the given code fragment's output?
- A. Compilation fails.
- B. US-UK
- C. -US=UK
- D. =US-UK
- E. US=UK
- F. An exception is thrown.
Explanation: Only visible for TestPassKing members. You can sign-up / login (it's free).
Which of the following statements is correct about a final class?
- A. It must contain at least a final method.
- B. It cannot be extended by any other class.
- C. It cannot extend another class.
- D. It cannot implement any interface.
- E. The final keyword in its declaration must go right before the class keyword.
Explanation: Only visible for TestPassKing members. You can sign-up / login (it's free).
