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Mock exam available

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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
var counter = 0;
do {
System.out.print(counter + " ");
} while (++counter < 3);
What is printed?

A) 1 2 3 4
B) 1 2 3
C) An exception is thrown.
D) 0 1 2
E) 0 1 2 3
F) Compilation fails.

2. Given:
java
var now = LocalDate.now();
var format1 = new DateTimeFormatter(ISO_WEEK_DATE);
var format2 = DateTimeFormatter.ISO_WEEK_DATE;
var format3 = new DateFormat(WEEK_OF_YEAR_FIELD);
var format4 = DateFormat.getDateInstance(WEEK_OF_YEAR_FIELD);
System.out.println(now.format(REPLACE_HERE));
Which variable prints 2025-W01-2 (present-day is 12/31/2024)?

A) format4
B) format1
C) format2
D) format3

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

4. Which of the following statements are correct?

A) You can use 'final' modifier with all kinds of classes
B) None
C) You can use 'public' access modifier with all kinds of classes
D) You can use 'private' access modifier with all kinds of classes
E) You can use 'protected' access modifier with all kinds of classes

5. 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) 42 000,00 €
C) 42000
D) 42 k

Solutions: