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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
public class BoomBoom implements AutoCloseable {
public static void main(String[] args) {
try (BoomBoom boomBoom = new BoomBoom()) {
System.out.print("bim ");
throw new Exception();
} catch (Exception e) {
System.out.print("boom ");
}
}
@Override
public void close() throws Exception {
System.out.print("bam ");
throw new RuntimeException();
}
}
What is printed?

A) bim boom
B) bim bam boom
C) Compilation fails.
D) bim bam followed by an exception
E) bim boom bam

2. Which of the following suggestions compile?(Choose two.)

A) 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;
}
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 class Circle extends Figure {
float radius;
}
non-sealed class Rectangle extends Figure {
float length, width;
}

3. Given:
java
String s = " ";
System.out.print("[" + s.strip());
s = " hello ";
System.out.print("," + s.strip());
s = "h i ";
System.out.print("," + s.strip() + "]");
What is printed?

A) [ , hello ,hi ]
B) [,hello,h i]
C) [ ,hello,h i]
D) [,hello,hi]

4. Which methods compile?

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

5. 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) WithInstanceField
C) ImplementingInterface
D) WithStaticField

Solutions: