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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Exception Handling | - Use try-with-resources - Handle checked and unchecked exceptions - Create custom exceptions |
| Topic 2: Collections and Generics | - Apply generics and bounded types - Use List, Set, Map, Queue, and Deque implementations - Use sequenced collections and maps |
| Topic 3: Object-Oriented Programming | - Apply inheritance and polymorphism - Create and use classes, interfaces, enums, and records - Implement encapsulation and abstraction |
| Topic 4: Handling Date, Time, Text, Numeric and Boolean Values | - Work with primitive wrappers and number formatting - Use String, StringBuilder, and related APIs - Use date, time, duration, period, and localization APIs |
| Topic 5: Annotations and JDBC | - Use built-in and custom annotations - Connect to databases using JDBC - Execute SQL operations and process results |
| Topic 6: Functional Programming | - Work with functional interfaces - Use lambda expressions and method references - Process data using Stream API |
| Topic 7: Java I/O and NIO | - Use Path, Files, and related APIs - Read and write files - Process file system resources |
| Topic 8: Java Concurrency | - Use virtual threads - Create and manage threads - Work with concurrent collections and executors |
| Topic 9: Modules and Packaging | - Create and use Java modules - Manage dependencies and exports - Package and deploy applications |
| Topic 10: Controlling Program Flow | - Apply decision statements and loops - Work with records and sealed classes - Use switch expressions and pattern matching |
Oracle Java SE 21 Developer Professional Sample Questions:
1. Given:
java
var _ = 3;
var $ = 7;
System.out.println(_ + $);
What is printed?
A) Compilation fails.
B) _$
C) 10
D) It throws an exception.
2. 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
3. Given:
java
System.out.print(Boolean.logicalAnd(1 == 1, 2 < 1));
System.out.print(Boolean.logicalOr(1 == 1, 2 < 1));
System.out.print(Boolean.logicalXor(1 == 1, 2 < 1));
What is printed?
A) Compilation fails
B) truefalsetrue
C) truetruetrue
D) truetruefalse
E) falsetruetrue
4. Which of the following doesnotexist?
A) BooleanSupplier
B) DoubleSupplier
C) They all exist.
D) Supplier<T>
E) BiSupplier<T, U, R>
F) LongSupplier
5. Which of the following java.io.Console methods doesnotexist?
A) readPassword()
B) readLine()
C) readPassword(String fmt, Object... args)
D) readLine(String fmt, Object... args)
E) reader()
F) read()
Solutions:
| Question # 1 Answer: A | Question # 2 Answer: A | Question # 3 Answer: B | Question # 4 Answer: E | Question # 5 Answer: F |
Clyde 
Anastasia 
Barret 
Maggie 
Will 
Virginia 
Len 
Ian 
Joa 
Agatha 
Truman 
Addison 
Tim 
Nicole 
Cheryl 
