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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Java Concurrency | - Use virtual threads - Create and manage threads - Work with concurrent collections and executors |
| Object-Oriented Programming | - Apply inheritance and polymorphism - Implement encapsulation and abstraction - Create and use classes, interfaces, enums, and records |
| Modules and Packaging | - Package and deploy applications - Manage dependencies and exports - Create and use Java modules |
| Collections and Generics | - Use sequenced collections and maps - Apply generics and bounded types - Use List, Set, Map, Queue, and Deque implementations |
| Handling Date, Time, Text, Numeric and Boolean Values | - Use date, time, duration, period, and localization APIs - Work with primitive wrappers and number formatting - Use String, StringBuilder, and related APIs |
| Exception Handling | - Create custom exceptions - Use try-with-resources - Handle checked and unchecked exceptions |
| Annotations and JDBC | - Execute SQL operations and process results - Connect to databases using JDBC - Use built-in and custom annotations |
| Controlling Program Flow | - Apply decision statements and loops - Work with records and sealed classes - Use switch expressions and pattern matching |
| Java I/O and NIO | - Read and write files - Process file system resources - Use Path, Files, and related APIs |
| Functional Programming | - Process data using Stream API - Use lambda expressions and method references - Work with functional interfaces |
Oracle Java SE 21 Developer Professional Sample Questions:
Which of the following can be the body of a lambda expression?
- A. An expression and a statement
- B. Two statements
- C. Two expressions
- D. None of the above
- E. A statement block
Correct Answer: E 🗳️
Explanation: Only visible for DumpsMaterials 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. False
- B. True
Correct Answer: A 🗳️
Explanation: Only visible for DumpsMaterials 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?
- A. postResult: 16, preResult: 16, Final value of post: 6, Final value of pre: 6
- B. postResult: 15, preResult: 16, Final value of post: 5, Final value of pre: 6
- C. postResult: 15, preResult: 16, Final value of post: 6, Final value of pre: 6
- D. postResult: 16, preResult: 15, Final value of post: 6, Final value of pre: 5
Correct Answer: C 🗳️
Explanation: Only visible for DumpsMaterials members. You can sign-up / login (it's free).
Given:
java
StringBuilder result = Stream.of("a", "b")
.collect(
() -> new StringBuilder("c"),
StringBuilder::append,
(a, b) -> b.append(a)
);
System.out.println(result);
What is the output of the given code fragment?
- A. abc
- B. cbca
- C. acb
- D. cba
- E. bca
- F. cacb
- G. bac
Correct Answer: D 🗳️
Explanation: Only visible for DumpsMaterials members. You can sign-up / login (it's free).
Given:
java
double amount = 42_000.00;
NumberFormat format = NumberFormat.getCompactNumberInstance(Locale.FRANCE, NumberFormat.Style.
SHORT);
System.out.println(format.format(amount));
What is the output?
- A. 42000E
- B. 42000
- C. 42 k
- D. 42 000,00 €
Correct Answer: C 🗳️
Explanation: Only visible for DumpsMaterials members. You can sign-up / login (it's free).
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