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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
interface Calculable {
long calculate(int i);
}
public class Test {
public static void main(String[] args) {
Calculable c1 = i -> i + 1; // Line 1
Calculable c2 = i -> Long.valueOf(i); // Line 2
Calculable c3 = i -> { throw new ArithmeticException(); }; // Line 3
}
}
Which lines fail to compile?

A) The program successfully compiles
B) Line 1 only
C) Line 3 only
D) Line 2 only
E) Line 2 and line 3
F) Line 1 and line 3
G) Line 1 and line 2

2. Given:
java
String colors = "red\n" +
"green\n" +
"blue\n";
Which text block can replace the above code?

A) None of the propositions
B) java
String colors = """
red \t
green\t
blue \t
""";
C) java
String colors = """
red \s
green\s
blue \s
""";
D) java
String colors = """
red \
green\
blue \
""";
E) java
String colors = """
red
green
blue
""";

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

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

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

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

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

Solutions: