Oracle 1Z0-830 Certification Sample Questions and Answers

1Z0-830 PDF, 1Z0-830 Dumps PDF Free Download, 1Z0-830 Latest Dumps Free PDF, Java SE Developer Professional PDF DumpsThe Oracle Java SE Developer Professional (1Z0-830) Sample Question Set is designed to help you prepare for the Oracle Certified Professional Java SE 21 Developer certification exam. To become familiar with the actual Oracle Certification exam environment, we suggest you try our Sample Oracle 1Z0-830 Certification Practice Exam.

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Oracle 1Z0-830 Sample Questions:

01. If a class is referenced in a main method but its filename is not specified, what should you assume?
a) The class is defined in the same file as the main method.
b) The class is located in a default package.
c) The class is inaccessible due to missing imports.
d) The code will not compile without a classpath declaration.
 
02. If a question involves a for loop and does not provide details about the iterable collection, what should you assume?
a) The collection is empty by default.
b) The collection is a valid iterable with sufficient elements.
c) The loop will not execute.
d) The code will throw a NullPointerException.
 
03. What does Double.parseDouble("NaN") return?
a) Throws NumberFormatException
b) Double.NEGATIVE_INFINITY
c) Double.NaN
d) 0.0
 
04. Which tool can be used to create a runtime image for a Java application?
a) jlink
b) javac
c) jar
d) jmod
 
05. What is assumed about missing package and import statements in code fragments?
a) They are not required for the code to compile.
b) The code belongs to the java.util package by default.
c) Necessary package and import statements exist to support the code.
d) The code assumes a default package is used.
 
06. Which exception is thrown if a method tries to access an element beyond the array’s length?
a) NullPointerException
b) IllegalArgumentException
c) NumberFormatException
d) ArrayIndexOutOfBoundsException
 
07. What should you assume about a code fragment that refers to a method from a utility class but does not include the class definition?
a) The method is defined as static.
b) The method is private and inaccessible.
c) The class and method definitions exist and support the call.
d) The method call will cause a compilation error.
 
08. When a code fragment includes an interface with an undefined method, what should you assume?
a) The method is abstract and must be implemented by a subclass.
b) The method is static and does not require implementation.
c) The method is optional.
d) The interface is incomplete and will cause a compilation error.
 
09. What happens if a class implements an interface but does not provide implementations for all its methods?
a) Compilation error
b) The class must be declared abstract
c) The class must implement all methods at runtime
d) The interface methods will be ignored
 
10. Which loop allows the initialization and condition to be declared outside the loop?
a) for-each loop
b) for loop
c) do-while loop
d) while loop

Answers:

Question: 01

Answer: a

Question: 02

Answer: b

Question: 03

Answer: c

Question: 04

Answer: a

Question: 05

Answer: c

Question: 06

Answer: d

Question: 07

Answer: c

Question: 08

Answer: a

Question: 09

Answer: b

Question: 10

Answer: d
Rating: 5 / 5 (1 vote)