Which of the following \"Data Types\" are considered \"Developer Defined Types\"

Question

Which of the following "Data Types" are considered "Developer Defined Types"? (Check all that apply): Integer Class Interface Interview package What is the most accurate description of an immutable Class? (Check one only): (a) A Class that can only be instantiated once. (b) A Class that offers no public constructors. (c) A Class that only offers "setter" methods. (d) A Class whose instances cannot be updated through instances methods. Which of the following is true about Java Interfaces? (Check all that apply): (a) They contain method definitions/declarations. (b) They contain method implementations. (c) They define behavior to be assumed by implementing Classes. (d) Interfaces have constructors. (e) Interfaces can extend other Interfaces. Examine the code fragment below. What exactly would the 3rd statement below display to the console (that is, the invocation print l n ()?:

Explanation / Answer

1 Ans) b,c

Explanation:- Developer defined types are the data types whose contents are defined by the developer

2 Ans) d

Explanation:- immutable class in Java means once they are instantiated their contents cannot be changed. To make classes immutable we should not write any methods that will update the instance variables

3 Ans) a,c,e

Explanation:- The purpose of interfaces in Java is to define a common behaviour through method declarations (but not implementing) which the implementing classes should implement.

4 Ans) numberArray[i]: 32

Explanation:- in line 2 'i' becomes '4'

and numberArray[4]= 32

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