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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
Stream<String> strings = Stream.of("United", "States");
BinaryOperator<String> operator = (s1, s2) -> s1.concat(s2.toUpperCase()); String result = strings.reduce("-", operator); System.out.println(result); What is the output of this code fragment?

A) -UnitedSTATES
B) UNITED-STATES
C) United-STATES
D) -UnitedStates
E) -UNITEDSTATES
F) United-States
G) UnitedStates

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: 5, Final value of pre: 6
B) postResult: 15, preResult: 16, Final value of post: 6, 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 of the following suggestions compile?(Choose two.)

A) java
public sealed class Figure
permits Circle, Rectangle {}
final class Circle extends Figure {
float radius;
}
non-sealed class Rectangle extends Figure {
float length, width;
}
B) java
sealed class Figure permits Rectangle {}
final class Rectangle extends Figure {
float length, width;
}
C) java
sealed class Figure permits Rectangle {}
public class Rectangle extends Figure {
float length, width;
}
D) java
public sealed class Figure
permits Circle, Rectangle {}
final sealed class Circle extends Figure {
float radius;
}
non-sealed class Rectangle extends Figure {
float length, width;
}

4. Which of the following can be the body of a lambda expression?

A) Two expressions
B) None of the above
C) An expression and a statement
D) A statement block
E) Two statements

5. 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<Exception>(); } csharp
D) ```java
public List<? super IOException> getListSuper() {
return new ArrayList<FileNotFoundException>();
}

Solutions: