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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
double amount = 42_000.00;
NumberFormat format = NumberFormat.getCompactNumberInstance(Locale.FRANCE, NumberFormat.Style.
SHORT);
System.out.println(format.format(amount));
What is the output?

A) 42000E
B) 42000
C) 42 k
D) 42 000,00 €

2. Given:
java
var hauteCouture = new String[]{ "Chanel", "Dior", "Louis Vuitton" };
var i = 0;
do {
System.out.print(hauteCouture[i] + " ");
} while (i++ > 0);
What is printed?

A) Chanel
B) Chanel Dior Louis Vuitton
C) Compilation fails.
D) An ArrayIndexOutOfBoundsException is thrown at runtime.

3. Given:
java
public class ThisCalls {
public ThisCalls() {
this(true);
}
public ThisCalls(boolean flag) {
this();
}
}
Which statement is correct?

A) It compiles.
B) It does not compile.
C) It throws an exception at runtime.

4. Which of the following can be the body of a lambda expression?

A) An expression and a statement
B) Two statements
C) Two expressions
D) None of the above
E) A statement block

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

Solutions: