Oracle 1z0-830 dumps - in .pdf

1z0-830 pdf
  • Exam Code: 1z0-830
  • Exam Name: Java SE 21 Developer Professional
  • Updated: Oct 30, 2026
  • Q & A: 85 Questions and Answers
  • PDF Price: $59.99
  • Free Demo

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  • Exam Code: 1z0-830
  • Exam Name: Java SE 21 Developer Professional
  • Updated: Oct 30, 2026
  • Q & A: 85 Questions and Answers
  • PDF Version + PC Test Engine + Online Test Engine
  • Value Pack Total: $119.98  $79.99
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Oracle 1z0-830 dumps - Testing Engine

1z0-830 Testing Engine
  • Exam Code: 1z0-830
  • Exam Name: Java SE 21 Developer Professional
  • Updated: Oct 30, 2026
  • Q & A: 85 Questions and Answers
  • Software Price: $59.99
  • Testing Engine

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Oracle 1z0-830 Exam Syllabus Topics:

SectionObjectives
Topic 1: Modules and Packaging- Create and use Java modules
- Package and deploy applications
- Manage dependencies and exports
Topic 2: Collections and Generics- Apply generics and bounded types
- Use sequenced collections and maps
- Use List, Set, Map, Queue, and Deque implementations
Topic 3: Object-Oriented Programming- Implement encapsulation and abstraction
- Create and use classes, interfaces, enums, and records
- Apply inheritance and polymorphism
Topic 4: Annotations and JDBC- Execute SQL operations and process results
- Connect to databases using JDBC
- Use built-in and custom annotations
Topic 5: Java I/O and NIO- Read and write files
- Process file system resources
- Use Path, Files, and related APIs
Topic 6: Controlling Program Flow- Use switch expressions and pattern matching
- Apply decision statements and loops
- Work with records and sealed classes
Topic 7: Exception Handling- Use try-with-resources
- Create custom exceptions
- Handle checked and unchecked exceptions
Topic 8: 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 9: Functional Programming- Use lambda expressions and method references
- Process data using Stream API
- Work with functional interfaces
Topic 10: Java Concurrency- Work with concurrent collections and executors
- Use virtual threads
- Create and manage threads

Oracle Java SE 21 Developer Professional Sample Questions:

Question #1

Which two of the following aren't the correct ways to create a Stream?

  • A. Stream stream = Stream.ofNullable("a");
  • B. Stream<String> stream = Stream.builder().add("a").build();
  • C. Stream stream = Stream.empty();
  • D. Stream stream = Stream.generate(() -> "a");
  • E. Stream stream = Stream.of();
  • F. Stream stream = new Stream();
Reveal Solution  Discussion  0

Correct Answer: B,F  🗳️

Question #2

Which methods compile?

  • A. ```java
    public List<? super IOException> getListSuper() {
    return new ArrayList<FileNotFoundException>();
    }
  • B. ```java public List<? extends IOException> getListExtends() { return new ArrayList<Exception>(); } csharp
  • C. ```java
    public List<? extends IOException> getListExtends() {
    return new ArrayList<FileNotFoundException>();
    }
  • D. ```java public List<? super IOException> getListSuper() { return new ArrayList<Exception>(); } csharp
Reveal Solution  Discussion  0

Correct Answer: C,D  🗳️

Explanation: Only visible for ExamDumpsVCE members. You can sign-up / login (it's free).

Question #3

Given:
java
List<String> frenchAuthors = new ArrayList<>();
frenchAuthors.add("Victor Hugo");
frenchAuthors.add("Gustave Flaubert");
Which compiles?

  • A. Map<String, ArrayList<String>> authorsMap1 = new HashMap<>();
    java
    authorsMap1.put("FR", frenchAuthors);
  • B. Map<String, ? extends List<String>> authorsMap2 = new HashMap<String, ArrayList<String>> (); java authorsMap2.put("FR", frenchAuthors);
  • C. Map<String, List<String>> authorsMap5 = new HashMap<String, List<String>>(); java authorsMap5.put("FR", frenchAuthors);
  • D. Map<String, List<String>> authorsMap4 = new HashMap<String, ArrayList<String>>(); java authorsMap4.put("FR", frenchAuthors);
  • E. var authorsMap3 = new HashMap<>();
    java
    authorsMap3.put("FR", frenchAuthors);
Reveal Solution  Discussion  0

Correct Answer: C,D,E  🗳️

Explanation: Only visible for ExamDumpsVCE members. You can sign-up / login (it's free).

Question #4

Given:
java
String colors = "red\n" +
"green\n" +
"blue\n";
Which text block can replace the above code?

  • A. java
    String colors = """
    red \t
    green\t
    blue \t
    """;
  • B. None of the propositions
  • C. java
    String colors = """
    red \
    green\
    blue \
    """;
  • D. java
    String colors = """
    red \s
    green\s
    blue \s
    """;
  • E. java
    String colors = """
    red
    green
    blue
    """;
Reveal Solution  Discussion  0

Correct Answer: E  🗳️

Explanation: Only visible for ExamDumpsVCE members. You can sign-up / login (it's free).

Question #5

You are working on a module named perfumery.shop that depends on another module named perfumery.
provider.
The perfumery.shop module should also make its package perfumery.shop.eaudeparfum available to other modules.
Which of the following is the correct file to declare the perfumery.shop module?

  • A. File name: module-info.java
    java
    module perfumery.shop {
    requires perfumery.provider;
    exports perfumery.shop.eaudeparfum;
    }
  • B. File name: module-info.perfumery.shop.java
    java
    module perfumery.shop {
    requires perfumery.provider;
    exports perfumery.shop.eaudeparfum.*;
    }
  • C. File name: module.java
    java
    module shop.perfumery {
    requires perfumery.provider;
    exports perfumery.shop.eaudeparfum;
    }
Reveal Solution  Discussion  0

Correct Answer: A  🗳️

Explanation: Only visible for ExamDumpsVCE members. You can sign-up / login (it's free).

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