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

2. Given:
java
var ceo = new HashMap<>();
ceo.put("Sundar Pichai", "Google");
ceo.put("Tim Cook", "Apple");
ceo.put("Mark Zuckerberg", "Meta");
ceo.put("Andy Jassy", "Amazon");
Does the code compile?

A) False
B) True

3. 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.

4. Which of the following java.io.Console methods doesnotexist?

A) readPassword(String fmt, Object... args)
B) read()
C) readLine(String fmt, Object... args)
D) readLine()
E) readPassword()
F) reader()

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) WithStaticField
B) WithInstanceField
C) ExtendingClass
D) ImplementingInterface

Solutions: