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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
public class Test {
public static void main(String[] args) throws IOException {
Path p1 = Path.of("f1.txt");
Path p2 = Path.of("f2.txt");
Files.move(p1, p2);
Files.delete(p1);
}
}
In which case does the given program throw an exception?

A) File f1.txt exists while file f2.txt doesn't
B) An exception is always thrown
C) Neither files f1.txt nor f2.txt exist
D) Both files f1.txt and f2.txt exist
E) File f2.txt exists while file f1.txt doesn't

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

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

3. Given:
java
Object myVar = 0;
String print = switch (myVar) {
case int i -> "integer";
case long l -> "long";
case String s -> "string";
default -> "";
};
System.out.println(print);
What is printed?

A) nothing
B) It throws an exception at runtime.
C) long
D) Compilation fails.
E) string
F) integer

4. Given:
java
String s = " ";
System.out.print("[" + s.strip());
s = " hello ";
System.out.print("," + s.strip());
s = "h i ";
System.out.print("," + s.strip() + "]");
What is printed?

A) [ , hello ,hi ]
B) [,hello,hi]
C) [,hello,h i]
D) [ ,hello,h i]

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

Solutions: