Free Oracle 1Z0-830 Exam Questions
Absolute Free 1Z0-830 Exam Practice for Comprehensive Preparation
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Oracle 1Z0-830 Exam Questions
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Provided By: Oracle
- Exam: Java SE 21 Developer Professional
- Certification: Oracle Java
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Total Questions: 84
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Updated On: Feb 21, 2025
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Rated: 4.9 |
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Online Users: 168
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Question 1
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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
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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'});
}
}
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Question 2
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Which three of the following are correct about the Java module system?
Answer: B,C,F
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Which three of the following are correct about the Java module system?
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Question 3
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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
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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?
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Question 4
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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?
Answer: D
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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?
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Question 5
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Which methods compile?
Answer: A,B
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Which methods compile?