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Instant Download Oracle : 1z1-830 Questions & Answers as PDF & Test Engine
- Exam Code: 1z1-830
- Exam Name: Java SE 21 Developer Professional
- Updated: Sep 17, 2026
- No. of Questions: 85 Questions and Answers
- Download Limit: Unlimited
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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Java I/O and NIO | - Use Path, Files, and related APIs - Read and write files - Process file system resources |
| Java Concurrency | - Use virtual threads - Create and manage threads - Work with concurrent collections and executors |
| Controlling Program Flow | - Use switch expressions and pattern matching - Apply decision statements and loops - Work with records and sealed classes |
| Functional Programming | - Work with functional interfaces - Process data using Stream API - Use lambda expressions and method references |
| Annotations and JDBC | - Connect to databases using JDBC - Execute SQL operations and process results - Use built-in and custom annotations |
| 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 |
| Modules and Packaging | - Manage dependencies and exports - Create and use Java modules - Package and deploy applications |
| Object-Oriented Programming | - Apply inheritance and polymorphism - Create and use classes, interfaces, enums, and records - Implement encapsulation and abstraction |
| Collections and Generics | - Apply generics and bounded types - Use List, Set, Map, Queue, and Deque implementations - Use sequenced collections and maps |
| Exception Handling | - Use try-with-resources - Create custom exceptions - Handle checked and unchecked exceptions |
Oracle Java SE 21 Developer Professional Sample Questions:
Which of the following can be the body of a lambda expression?
- A. A statement block
- B. Two statements
- C. Two expressions
- D. An expression and a statement
- E. None of the above
Correct Answer: A 🗳️
Explanation: Only visible for TrainingDump members. You can sign-up / login (it's free).
Given:
java
List<String> l1 = new ArrayList<>(List.of("a", "b"));
List<String> l2 = new ArrayList<>(Collections.singletonList("c"));
Collections.copy(l1, l2);
l2.set(0, "d");
System.out.println(l1);
What is the output of the given code fragment?
- A. An UnsupportedOperationException is thrown
- B. An IndexOutOfBoundsException is thrown
- C. [d, b]
- D. [d]
- E. [c, b]
- F. [a, b]
Correct Answer: E 🗳️
Explanation: Only visible for TrainingDump members. You can sign-up / login (it's free).
Given:
java
record WithInstanceField(String foo, int bar) {
double fuz;
}
record WithStaticField(String foo, int bar) {
static double wiz;
}
record ExtendingClass(String foo) extends Exception {}
record ImplementingInterface(String foo) implements Cloneable {}
Which records compile? (Select 2)
- A. ExtendingClass
- B. WithStaticField
- C. WithInstanceField
- D. ImplementingInterface
Correct Answer: B,D 🗳️
Explanation: Only visible for TrainingDump members. You can sign-up / login (it's free).
Which of the following statements are correct?
- A. You can use 'private' access modifier with all kinds of classes
- B. None
- C. You can use 'public' access modifier with all kinds of classes
- D. You can use 'protected' access modifier with all kinds of classes
- E. You can use 'final' modifier with all kinds of classes
Correct Answer: B 🗳️
Explanation: Only visible for TrainingDump members. You can sign-up / login (it's free).
Given:
java
var hauteCouture = new String[]{ "Chanel", "Dior", "Louis Vuitton" };
var i = 0;
do {
System.out.print(hauteCouture[i] + " ");
} while (i++ > 0);
What is printed?
- A. An ArrayIndexOutOfBoundsException is thrown at runtime.
- B. Chanel
- C. Compilation fails.
- D. Chanel Dior Louis Vuitton
Correct Answer: B 🗳️
Explanation: Only visible for TrainingDump members. You can sign-up / login (it's free).
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