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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
public class Test {
class A {
}
static class B {
}
public static void main(String[] args) {
// Insert here
}
}
Which three of the following are valid statements when inserted into the given program?

A) B b = new Test().new B();
B) A a = new A();
C) B b = new Test.B();
D) B b = new B();
E) A a = new Test.A();
F) A a = new Test().new A();

2. Which of the following doesnotexist?

A) Supplier<T>
B) They all exist.
C) BiSupplier<T, U, R>
D) BooleanSupplier
E) DoubleSupplier
F) LongSupplier

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

4. Which of the followingisn'ta correct way to write a string to a file?

A) java
try (BufferedWriter writer = new BufferedWriter("file.txt")) {
writer.write("Hello");
}
B) java
try (PrintWriter printWriter = new PrintWriter("file.txt")) {
printWriter.printf("Hello %s", "James");
}
C) None of the suggestions
D) java
try (FileWriter writer = new FileWriter("file.txt")) {
writer.write("Hello");
}
E) java
try (FileOutputStream outputStream = new FileOutputStream("file.txt")) { byte[] strBytes = "Hello".getBytes(); outputStream.write(strBytes);
}
F) java
Path path = Paths.get("file.txt");
byte[] strBytes = "Hello".getBytes();
Files.write(path, strBytes);

5. 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,h i]
B) [ ,hello,h i]
C) [,hello,hi]
D) [ , hello ,hi ]

Solutions: