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Array Methods DCIT25: Understanding Arrays and Array Creation

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Questions and Answers

Which of the following is a valid way to declare an integer array in Java?

int[] numbers = new int[];
int[] numbers = new int[5]; (correct)
int[] numbers = {1, 2, 3};
int numbers[] = new int[];

Which method is used in Java to compare the equality of two arrays?

Arrays.equal()
Arrays.equals() (correct)
Arrays.checkEquality()
Arrays.compare()

What is the purpose of Arrays.copyOf() method in Java?

To sort an array
To create a deep copy of an array
To create a shallow copy of an array (correct)
To resize an existing array

Which method should be used to search for an element in a sorted array in Java?

Arrays.binarySearch() (B) Signup and view all the answers

If you want to sort an array of integers into descending order, which method should you use?

Arrays.sort() with custom Comparator (D) Signup and view all the answers

When declaring a new integer array in Java, what is the default initial value for each element?

0 (A) Signup and view all the answers

'Arrays.fill()' method in Java is used for what purpose?

'0' initializing all elements of an array with a specific value (D) Signup and view all the answers

'Arrays.toString()' method in Java is used for?

'0' converting an array into a String representation (B) Signup and view all the answers

'Arrays.asList()' method in Java is used for what purpose?

'0' converting an array into a List (A) Signup and view all the answers

'Arrays.copyofRange()' method in Java is used for what purpose?

'0' converting a range of elements in an array into a new array (A) Signup and view all the answers

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