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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
public class OuterClass {
String outerField = "Outer field";
class InnerClass {
void accessMembers() {
System.out.println(outerField);
}
}
public static void main(String[] args) {
System.out.println("Inner class:");
System.out.println("------------");
OuterClass outerObject = new OuterClass();
InnerClass innerObject = new InnerClass(); // n1
innerObject.accessMembers(); // n2
}
}
What is printed?

A) An exception is thrown at runtime.
B) Compilation fails at line n1.
C) Nothing
D) Compilation fails at line n2.
E) markdown
Inner class:
------------
Outer field

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

3. Given:
java
int post = 5;
int pre = 5;
int postResult = post++ + 10;
int preResult = ++pre + 10;
System.out.println("postResult: " + postResult +
", preResult: " + preResult +
", Final value of post: " + post +
", Final value of pre: " + pre);
What is printed?

A) postResult: 16, preResult: 16, Final value of post: 6, Final value of pre: 6
B) postResult: 15, preResult: 16, Final value of post: 6, Final value of pre: 6
C) postResult: 15, preResult: 16, Final value of post: 5, Final value of pre: 6
D) postResult: 16, preResult: 15, Final value of post: 6, Final value of pre: 5

4. What do the following print?
java
public class Main {
int instanceVar = staticVar;
static int staticVar = 666;
public static void main(String args[]) {
System.out.printf("%d %d", new Main().instanceVar, staticVar);
}
static {
staticVar = 42;
}
}

A) 666 666
B) Compilation fails
C) 666 42
D) 42 42

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

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

Solutions: