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Oracle Certification
1z1-829 Exam
Oracle.1z1-829.v2024-08-03.q35 Dumps

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Question 26

Given the code fragment:

What is the result?

A.False true true optional (Newyear)
B.0110
C.True true false NewYear
D.010 optional (Newyear)

Correct Answer: A

The code fragment is using the stream methods allMatch, anyMatch, noneMatch, and findFirst on a list of strings called specialDays. These methods are used to perform matching operations on the elements of a stream, such as checking if all, any, or none of the elements satisfy a given predicate, or finding the first element that matches a predicate1. The predicate in this case is that the string equals "Labour" or "Halloween". The output will be:
False: because not all of the elements in specialDays are equal to "Labour" or "Halloween".
true: because at least one of the elements in specialDays is equal to "Labour" or "Halloween".
true: because none of the elements in specialDays are equal to both "Labour" and "Halloween".
Optional[NewYear]: because the first element in specialDays that matches the predicate is "NewYear", and the findFirst method returns an Optional object that may or may not contain a non-null value2.

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Question 27

Assuming that the data, txt file exists and has the following content:
Text1
Text2
Text3
Given the code fragment:

What is the result?

A.text1-
text2-
text3-
text3
B.text1-text2-text3
text1
text2
text3
C.text1-text2-text3
A java.lang.indexoutofBoundsException is thrown.
D.text1-text2-text3
text3

Correct Answer: D

The answer is D because the code fragment reads the file "data.txt" and collects all the lines in the file into a single string, separated by hyphens. Then, it prints the resulting string. Next, it attempts to read the fourth line in the file (index 3) and print it. However, since the file only has three lines, an IndexOutOfBoundsException is thrown. Reference:
Oracle Certified Professional: Java SE 17 Developer
Java SE 17 Developer
OCP Oracle Certified Professional Java SE 17 Developer Study Guide
Read contents of a file using Files class in Java

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Question 28

Given the code fragment:

What is the result?

A.$SIM6D
B.PT5000PT60MP6D
C.PT5SPTIMP6D
D.5000$60M6D

Correct Answer: B

The code fragment is creating a Duration object with a value of 5000 milliseconds, then printing it. Then, it is creating another Duration object with a value of 60 seconds, then printing it. Finally, it is creating a Period object with a value of 6 days, then printing it. The output will be "PT5000PT60MP6D". Reference: https://docs.oracle.com/javase/8/docs/api/java/time/Duration.html, https://docs.oracle.com/javase/8/docs/api/java/time/Period.html

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Question 29

Given:

A.Hello
B.Compilation fails
C.A NumberFormatException is thrown
D.there

Correct Answer: B

Explanation
The code fragment will fail to compile because the parseInt method of the Integer class is a static method, which means that it can be invoked without creating an object of the class. However, the code is trying to invoke the parseInt method on an object of type Integer, which is not allowed. The correct way to invoke the parseInt method is by using the class name, such as Integer.parseInt (s). Therefore, the code fragment will produce a compilation error. References: Integer (Java SE 17 & JDK 17) - Oracle

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Question 30

Given:

What is the result?

A.Tablechair Tablechair
B.Wtablechair tableChair
C.A RuntimeException is thrown
D.wTableChair TableChair
E.Compilation fails

Correct Answer: E

The code fragment will fail to compile because the class name and the constructor name do not match. The class name is Furniture, but the constructor name is Wtable. This will cause a syntax error. The correct way to define a constructor is to use the same name as the class name. Therefore, the code fragment should change the constructor name to Furniture or change the class name to Wtable.

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