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Oracle 1z1-830 Exam Overview:
| Certification Vendor: | Oracle |
| Exam Name: | Java SE 21 Developer Professional |
| Exam Number: | 1Z0-830 |
| Exam Duration: | 120 minutes |
| Exam Price: | $245 USD |
| Real Exam Qty: | 50 |
| Passing Score: | 68% |
| Related Certifications: | Oracle Certified Professional: Java SE 21 Developer |
| Available Languages: | English |
| Exam Format: | Multiple Choice |
| Sample Questions: | Oracle 1z1-830 Sample Questions |
| Exam Way: | Online proctored exam or in-person at Pearson VUE testing centers. |
| Pre Condition: | No mandatory prerequisite certification. Recommended experience with Java programming and modern Java SE features. |
| Official Syllabus URL: | https://education.oracle.com/java-se-21-developer-professional/pexam_1Z0-830 |
Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| 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 |
| Annotations and JDBC | - Connect to databases using JDBC - Use built-in and custom annotations - Execute SQL operations and process results |
| Functional Programming | - Work with functional interfaces - Process data using Stream API - Use lambda expressions and method references |
| Modules and Packaging | - Manage dependencies and exports - Create and use Java modules - Package and deploy applications |
| Java Concurrency | - Use virtual threads - Work with concurrent collections and executors - Create and manage threads |
| Controlling Program Flow | - Work with records and sealed classes - Use switch expressions and pattern matching - Apply decision statements and loops |
| Java I/O and NIO | - Read and write files - Process file system resources - Use Path, Files, and related APIs |
| Object-Oriented Programming | - Implement encapsulation and abstraction - Create and use classes, interfaces, enums, and records - Apply inheritance and polymorphism |
| Collections and Generics | - Use sequenced collections and maps - Use List, Set, Map, Queue, and Deque implementations - Apply generics and bounded types |
| Exception Handling | - Use try-with-resources - Handle checked and unchecked exceptions - Create custom exceptions |
Oracle Java SE 21 Developer Professional Sample Questions:
1. Given:
java
Deque<Integer> deque = new ArrayDeque<>();
deque.offer(1);
deque.offer(2);
var i1 = deque.peek();
var i2 = deque.poll();
var i3 = deque.peek();
System.out.println(i1 + " " + i2 + " " + i3);
What is the output of the given code fragment?
A) 1 1 1
B) 1 2 2
C) 2 2 2
D) 1 1 2
E) An exception is thrown.
F) 2 2 1
G) 1 2 1
H) 2 1 1
I) 2 1 2
2. 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: 15, 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: 16, preResult: 15, Final value of post: 6, Final value of pre: 5
D) postResult: 16, preResult: 16, Final value of post: 6, Final value of pre: 6
3. Which methods compile?
A) ```java public List<? extends IOException> getListExtends() { return new ArrayList<Exception>(); } csharp
B) ```java
public List<? extends IOException> getListExtends() {
return new ArrayList<FileNotFoundException>();
}
C) ```java
public List<? super IOException> getListSuper() {
return new ArrayList<FileNotFoundException>();
}
D) ```java public List<? super IOException> getListSuper() { return new ArrayList<Exception>(); } csharp
4. 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.java
java
module shop.perfumery {
requires perfumery.provider;
exports perfumery.shop.eaudeparfum;
}
C) File name: module-info.perfumery.shop.java
java
module perfumery.shop {
requires perfumery.provider;
exports perfumery.shop.eaudeparfum.*;
}
5. 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) [a, b]
B) An IndexOutOfBoundsException is thrown
C) [c, b]
D) [d]
E) An UnsupportedOperationException is thrown
F) [d, b]
Solutions:
| Question # 1 Answer: B | Question # 2 Answer: A | Question # 3 Answer: B,D | Question # 4 Answer: A | Question # 5 Answer: C |
Oracle 1z1-830 Exam Overview:
| Certification Vendor: | Oracle |
| Exam Name: | Java SE 21 Developer Professional |
| Exam Number: | 1Z0-830 |
| Exam Duration: | 120 minutes |
| Exam Price: | $245 USD |
| Real Exam Qty: | 50 |
| Passing Score: | 68% |
| Related Certifications: | Oracle Certified Professional: Java SE 21 Developer |
| Available Languages: | English |
| Exam Format: | Multiple Choice |
| Sample Questions: | Oracle 1z1-830 Sample Questions |
| Exam Way: | Online proctored exam or in-person at Pearson VUE testing centers. |
| Pre Condition: | No mandatory prerequisite certification. Recommended experience with Java programming and modern Java SE features. |
| Official Syllabus URL: | https://education.oracle.com/java-se-21-developer-professional/pexam_1Z0-830 |
Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| 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 |
| Annotations and JDBC | - Connect to databases using JDBC - Use built-in and custom annotations - Execute SQL operations and process results |
| Functional Programming | - Work with functional interfaces - Process data using Stream API - Use lambda expressions and method references |
| Modules and Packaging | - Manage dependencies and exports - Create and use Java modules - Package and deploy applications |
| Java Concurrency | - Use virtual threads - Work with concurrent collections and executors - Create and manage threads |
| Controlling Program Flow | - Work with records and sealed classes - Use switch expressions and pattern matching - Apply decision statements and loops |
| Java I/O and NIO | - Read and write files - Process file system resources - Use Path, Files, and related APIs |
| Object-Oriented Programming | - Implement encapsulation and abstraction - Create and use classes, interfaces, enums, and records - Apply inheritance and polymorphism |
| Collections and Generics | - Use sequenced collections and maps - Use List, Set, Map, Queue, and Deque implementations - Apply generics and bounded types |
| Exception Handling | - Use try-with-resources - Handle checked and unchecked exceptions - Create custom exceptions |
Oracle Java SE 21 Developer Professional Sample Questions:
1. Given:
java
Deque<Integer> deque = new ArrayDeque<>();
deque.offer(1);
deque.offer(2);
var i1 = deque.peek();
var i2 = deque.poll();
var i3 = deque.peek();
System.out.println(i1 + " " + i2 + " " + i3);
What is the output of the given code fragment?
A) 1 1 1
B) 1 2 2
C) 2 2 2
D) 1 1 2
E) An exception is thrown.
F) 2 2 1
G) 1 2 1
H) 2 1 1
I) 2 1 2
2. 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: 15, 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: 16, preResult: 15, Final value of post: 6, Final value of pre: 5
D) postResult: 16, preResult: 16, Final value of post: 6, Final value of pre: 6
3. Which methods compile?
A) ```java public List<? extends IOException> getListExtends() { return new ArrayList<Exception>(); } csharp
B) ```java
public List<? extends IOException> getListExtends() {
return new ArrayList<FileNotFoundException>();
}
C) ```java
public List<? super IOException> getListSuper() {
return new ArrayList<FileNotFoundException>();
}
D) ```java public List<? super IOException> getListSuper() { return new ArrayList<Exception>(); } csharp
4. 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.java
java
module shop.perfumery {
requires perfumery.provider;
exports perfumery.shop.eaudeparfum;
}
C) File name: module-info.perfumery.shop.java
java
module perfumery.shop {
requires perfumery.provider;
exports perfumery.shop.eaudeparfum.*;
}
5. 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) [a, b]
B) An IndexOutOfBoundsException is thrown
C) [c, b]
D) [d]
E) An UnsupportedOperationException is thrown
F) [d, b]
Solutions:
| Question # 1 Answer: B | Question # 2 Answer: A | Question # 3 Answer: B,D | Question # 4 Answer: A | Question # 5 Answer: C |
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