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Oracle Java SE 21 Developer Professional Sample Questions:

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

2. Given:
java
interface SmartPhone {
boolean ring();
}
class Iphone15 implements SmartPhone {
boolean isRinging;
boolean ring() {
isRinging = !isRinging;
return isRinging;
}
}
Choose the right statement.

A) Iphone15 class does not compile
B) An exception is thrown at running Iphone15.ring();
C) SmartPhone interface does not compile
D) Everything compiles

3. Which of the following statements oflocal variables declared with varareinvalid?(Choose 4)

A) var d[] = new int[4];
B) var e;
C) var f = { 6 };
D) var b = 2, c = 3.0;
E) var h = (g = 7);
F) var a = 1;(Valid: var correctly infers int)

4. Given:
java
List<String> abc = List.of("a", "b", "c");
abc.stream()
.forEach(x -> {
x = x.toUpperCase();
});
abc.stream()
.forEach(System.out::print);
What is the output?

A) Compilation fails.
B) ABC
C) abc
D) An exception is thrown.

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

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

Solutions: