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Oracle Java SE 21 Developer Professional Sample Questions:

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

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

2. Consider the following methods to load an implementation of MyService using ServiceLoader. Which of the methods are correct? (Choose all that apply)

A) MyService service = ServiceLoader.services(MyService.class).getFirstInstance();
B) MyService service = ServiceLoader.load(MyService.class).iterator().next();
C) MyService service = ServiceLoader.getService(MyService.class);
D) MyService service = ServiceLoader.load(MyService.class).findFirst().get();

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

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

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

Solutions: