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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

Question 1

Which of the following statements is correct about a final class?

A. It cannot be extended by any other class.
B. It cannot extend another class.
C. The final keyword in its declaration must go right before the class keyword.
D. It must contain at least a final method.
E. It cannot implement any interface.

Question 2

Given:
java
public class ExceptionPropagation {
public static void main(String[] args) {
try {
thrower();
System.out.print("Dom Perignon, ");
} catch (Exception e) {
System.out.print("Chablis, ");
} finally {
System.out.print("Saint-Emilion");
}
}
static int thrower() {
try {
int i = 0;
return i / i;
} catch (NumberFormatException e) {
System.out.print("Rose");
return -1;
} finally {
System.out.print("Beaujolais Nouveau, ");
}
}
}
What is printed?

A. Rose
B. Beaujolais Nouveau, Chablis, Dom Perignon, Saint-Emilion
C. Beaujolais Nouveau, Chablis, Saint-Emilion
D. Saint-Emilion

Question 3

What is the output of the following snippet? (Assume the file exists)
java
Path path = Paths.get("C:\\home\\joe\\foo");
System.out.println(path.getName(0));

A. C:
B. Compilation error
C. C
D. home
E. IllegalArgumentException

Question 4

Given:
java
public class ThisCalls {
public ThisCalls() {
this(true);
}
public ThisCalls(boolean flag) {
this();
}
}
Which statement is correct?

A. It does not compile.
B. It throws an exception at runtime.
C. It compiles.

Question 5

Given:
java
Map<String, Integer> map = Map.of("b", 1, "a", 3, "c", 2);
TreeMap<String, Integer> treeMap = new TreeMap<>(map);
System.out.println(treeMap);
What is the output of the given code fragment?

A. {b=1, c=2, a=3}
B. {b=1, a=3, c=2}
C. Compilation fails
D. {a=1, b=2, c=3}
E. {c=1, b=2, a=3}
F. {c=2, a=3, b=1}
G. {a=3, b=1, c=2}

Solutions: