Question

OBJECT-ORIENTED JAVA

The catch-or-declare requirement states that you have two choices:
You can either catch the exception or you can provide a throws clause.

To which exceptions does the catch-or-declare requirement apply?

Errors

All Exceptions except RuntimeExceptions

RuntimeExceptions

All Throwable except Errors

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Question 21 pts

Assume you have an array called numbers.
It's elements are of type int and it was declared like this:

int[] numbers = { 3, 6, 9, 12 };

Assume that you also have a method called printArray. It was declared with the following method header:

private static void printArray(T[] inputArray)

Based on the information above answer the following question:
What happens when you call the method printArray and you pass the array numbers as an argument - like this:
printArray(numbers);

No elements are printed

The array elements are printed in rectangular brackets as specified in the toString method

The array elements are printed as specified in method printArray

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Question 32 pts

Complete the sentences below.

Generic method declarations have a type parameter section that is delimited by                            [ Select ]                       ["{ }", "( )", "<>", "[ ]"]         .

When we instantiate a generic class or interface without any type arguments it is said to have a                            [ Select ]                       ["wild type", "diamond", "raw type", "generic type"]         .

Such types should be                            [ Select ]                       ["used whenever possible", "avoided", "encouraged"]         in new code.

In order to be able to use the interface method compareTo in my generic method I need to restrict the types that can be substituted for the type parameter. I can do this like this:                            [ Select ]                       [">", "< implements Comparable>", ">", "< extends Comparable>"]      

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Question 42 pts

Match each problem on the left to the Java API class that is best suited to help solve the problem

I need to read in test results from a csv file

      [ Choose ]            File            Scanner            ObjectOutputStream            PrintWriter      

I need to list all files of a given directory

      [ Choose ]            File            Scanner            ObjectOutputStream            PrintWriter      

I need to serialize a prodcut list ( List )

      [ Choose ]            File            Scanner            ObjectOutputStream            PrintWriter      

I need to save the names and sNumbers of all CS1410 students in a text file.

      [ Choose ]            File            Scanner            ObjectOutputStream            PrintWriter      

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Question 52 pts

Complete the sentences below.

In order to serialize an object from the heap and store it to a file we need 2 Java API classes to work together:                            [ Select ]                       ["ObjectInputStream and ObjectOutputStream", "FileOutputStream and FileOutputStream", "ObjectInputStream and FileInputStream", "ObjectOutputStream and FileOutputStream"]      

                           [ Select ]                       ["FileInputStream", "ObjectOutputStream", "ObjectInputStream", "FileOutputStream"]         takes the object from the heap and turns it into a stream of bytes and                            [ Select ]                       ["FileOutputStream", "ObjectInputStream", "ObjectOutputStream", "FileInputStream"]          takes the stream of bytes and stores it in a file.
  

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Question 61 pts

Which of the following best describes the relationship between ClassX and ClassY?

Association

Aggregation

Composition

Inheritance

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Question 72 pts

Match each description on the left to the corresponding term.   

A sequence of bytes, which can be accessed in sequential order

      [ Choose ]            Serialization            Stream            File      

Data or information that has a name and is stored on a secondary storage device

      [ Choose ]            Serialization            Stream            File      

The process of converting an object into a stream

      [ Choose ]            Serialization            Stream            File      

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Question 81 pts

Complete the sentence below:
Classes that implement the interface   ................................ can be used as a resource in a try-with-resource statement

AutoClosable

AutoResource

Serializable

Collection

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Question 91 pts

When the compiler translates generic methods into byte-code it uses _____________ to replace the type parameter with actual types

Generic type replacement

Compile-time type safety

Eraser

Erasure

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Answer 1

(Q21) public static <T> void printArray(T[] array)

we can't take parameterized type as T if we take it should return same type what is parameterized

the method you provides shows compile time error

Q32)

(Q)Generic method declarations have a type parameter section that is delimited by  

Ans :- <>

(Q) When we instantiate a generic class or interface without any type arguments it is said to have a   

Ans : raw type

(Q) In order to be able to use the interface method compareTo in my generic method I need to restrict the types that can be substituted for the type parameter. I can do this like this:

Ans : < implements Comparable>

Q42)

(Q)the Java API class that is best suited to help solve the problemI need to read in test results from a csv file

Ans : File

(Q) I need to list all files of a given directory

Ans :File

(Q) I need to serialize a prodcut list ( List )

Ans : ObjectOutputStream

(Q) I need to save the names and sNumbers of all CS1410 students in a text file.

Ans:File

Q52)

(Q) In order to serialize an object from the heap and store it to a file we need 2 Java API classes to work together:  

Ans: ObjectInputStream and ObjectOutputStream

(Q) takes the object from the heap and turns it into a stream of bytes

Ans : FileInputStream

(Q)    takes the stream of bytes and stores it in a file.

Ans : ObjectOutputStream

Q61)Which of the following best describes the relationship between ClassX and ClassY?

Ans : Association

Q72)

(Q) A sequence of bytes, which can be accessed in sequential order

Ans : Stream  

(Q) Data or information that has a name and is stored on a secondary storage device

Ans :File

(Q) The process of converting an object into a stream

Ans :Serialization

Q81) Classes that implement the interface   ................................ can be used as a resource in a try-with-resource statement

Ans : AutoClosable

Q91) When the compiler translates generic methods into byte-code it uses _____________ to replace the type parameter with actual types

Ans : Erasure