Instant Download Oracle : 1z0-830
Check Updated on: Sep 11, 2026
No. of Questions: 85 Questions & Answers with Exam Engine
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- Total Questions: 85
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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Object-Oriented Programming | - Core OOP principles
|
| Topic 2: Concurrency and Multithreading | - Thread management
|
| Topic 3: Advanced Java Features (Java SE 21) | - Modern language features
|
| Topic 4: Database Connectivity (JDBC) | - Database interaction
|
| Topic 5: Exception Handling and Debugging | - Error handling mechanisms
|
| Topic 6: Java Language Fundamentals | - Java syntax and language structure
|
| Topic 7: Input/Output and File Handling | - NIO and file operations
|
| Topic 8: Core APIs | - Java standard library usage
|
Oracle Java SE 21 Developer Professional Sample Questions:
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. WithInstanceField
- B. ExtendingClass
- C. ImplementingInterface
- D. WithStaticField
Explanation: Only visible for ITPassLeader members. You can sign-up / login (it's free).
Given:
java
Integer frenchRevolution = 1789;
Object o1 = new String("1789");
Object o2 = frenchRevolution;
frenchRevolution = null;
Object o3 = o2.toString();
System.out.println(o1.equals(o3));
What is printed?
- A. true
- B. Compilation fails.
- C. A NullPointerException is thrown.
- D. A ClassCastException is thrown.
- E. false
Explanation: Only visible for ITPassLeader members. You can sign-up / login (it's free).
Given:
java
interface A {
default void ma() {
}
}
interface B extends A {
static void mb() {
}
}
interface C extends B {
void ma();
void mc();
}
interface D extends C {
void md();
}
interface E extends D {
default void ma() {
}
default void mb() {
}
default void mc() {
}
}
Which interface can be the target of a lambda expression?
- A. E
- B. C
- C. None of the above
- D. B
- E. A
- F. D
Explanation: Only visible for ITPassLeader members. You can sign-up / login (it's free).
Given:
java
public class ThisCalls {
public ThisCalls() {
this(true);
}
public ThisCalls(boolean flag) {
this();
}
}
Which statement is correct?
- A. It throws an exception at runtime.
- B. It does not compile.
- C. It compiles.
Explanation: Only visible for ITPassLeader members. You can sign-up / login (it's free).
Given:
java
interface Calculable {
long calculate(int i);
}
public class Test {
public static void main(String[] args) {
Calculable c1 = i -> i + 1; // Line 1
Calculable c2 = i -> Long.valueOf(i); // Line 2
Calculable c3 = i -> { throw new ArithmeticException(); }; // Line 3
}
}
Which lines fail to compile?
- A. Line 3 only
- B. The program successfully compiles
- C. Line 1 and line 3
- D. Line 2 and line 3
- E. Line 1 and line 2
- F. Line 2 only
- G. Line 1 only
Explanation: Only visible for ITPassLeader members. You can sign-up / login (it's free).
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