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  • Exam Code: 1z0-830
  • Exam Title: Java SE 21 Developer Professional
  • Vendor: Oracle
  • Exam Questions: 84
  • Last Updated: March 9th,2026

Question 1

Given: java
Object myVar = 0;
String print = switch (myVar) { case int i -> "integer";
case long l -> "long"; case String s -> "string"; default -> "";
};
System.out.println(print); What is printed?

Correct Answer:F

Question 2

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?

Correct Answer:BEF

Question 3

Given: java
String colors = "redn" + "greenn" +
"bluen";
Which text block can replace the above code?

Correct Answer:D

Question 4

Given: java
public class Test {
public static void main(String[] args) throws IOException { Path p1 = Path.of("f1.txt");
Path p2 = Path.of("f2.txt"); Files.move(p1, p2); Files.delete(p1);
}
}
In which case does the given program throw an exception?

Correct Answer:C

Question 5

What is the output of the following snippet? (Assume the file exists) java
Path path = Paths.get("C:\home\joe\foo"); System.out.println(path.getName(0));

Correct Answer:E