Free Oracle 1Z0-830 Exam Questions
Try our Free Demo Practice Tests for Comprehensive 1Z0-830 Exam Preparation
-
Oracle 1Z0-830 Exam Questions
-
Provided By: Oracle
- Exam: Java SE 21 Developer Professional
- Certification: Oracle Java
-
Total Questions: 84
-
Updated On: Apr 19, 2025
-
Rated: 4.9 |
-
Online Users: 168
-
Question 1
-
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?
Answer: C
-
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?
-
Question 2
-
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?
Answer: C
-
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?
-
Question 3
-
Which methods compile?
Answer: A,B
-
Which methods compile?
-
Question 4
-
Which StringBuilder variable fails to compile?
java
public class StringBuilderInstantiations {
public static void main(String[] args) {
var stringBuilder1 = new StringBuilder();
var stringBuilder2 = new StringBuilder(10);
var stringBuilder3 = new StringBuilder("Java");
var stringBuilder4 = new StringBuilder(new char[]{'J', 'a', 'v', 'a'});
}
}
Answer: B
-
Which StringBuilder variable fails to compile?
java
public class StringBuilderInstantiations {
public static void main(String[] args) {
var stringBuilder1 = new StringBuilder();
var stringBuilder2 = new StringBuilder(10);
var stringBuilder3 = new StringBuilder("Java");
var stringBuilder4 = new StringBuilder(new char[]{'J', 'a', 'v', 'a'});
}
}
-
Question 5
-
Which of the following statements oflocal variables declared with varareinvalid?(Choose 4)
Answer: B,C,D,E
-
Which of the following statements oflocal variables declared with varareinvalid?(Choose 4)