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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following statements are correct?

A) You can use 'final' modifier with all kinds of classes
B) You can use 'protected' access modifier with all kinds of classes
C) None
D) You can use 'public' access modifier with all kinds of classes
E) You can use 'private' access modifier with all kinds of classes

2. 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) IllegalArgumentException
B) C:
C) Compilation error
D) home
E) C

3. 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) A ClassCastException is thrown.
B) A NullPointerException is thrown.
C) false
D) true
E) Compilation fails.

4. Given:
var cabarets = new TreeMap<>();
cabarets.put(1, "Moulin Rouge");
cabarets.put(2, "Crazy Horse");
cabarets.put(3, "Paradis Latin");
cabarets.put(4, "Le Lido");
cabarets.put(5, "Folies Bergere");
System.out.println(cabarets.subMap(2, true, 5, false));
What is printed?

A) An exception is thrown at runtime.
B) {}
C) CopyEdit{2=Crazy Horse, 3=Paradis Latin, 4=Le Lido, 5=Folies Bergere}
D) {2=Crazy Horse, 3=Paradis Latin, 4=Le Lido}
E) Compilation fails.

5. Given:
java
public class OuterClass {
String outerField = "Outer field";
class InnerClass {
void accessMembers() {
System.out.println(outerField);
}
}
public static void main(String[] args) {
System.out.println("Inner class:");
System.out.println("------------");
OuterClass outerObject = new OuterClass();
InnerClass innerObject = new InnerClass(); // n1
innerObject.accessMembers(); // n2
}
}
What is printed?

A) markdown
Inner class:
------------
Outer field
B) Nothing
C) Compilation fails at line n1.
D) An exception is thrown at runtime.
E) Compilation fails at line n2.

Solutions: