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Java Arrays and Collections Quiz

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Questions and Answers

What does the error 'ArrayIndexOutOfBounds' indicate?

The array index being referred to is outside the bounds of the array. (correct)

The array is sorted in descending order.

The array is empty and no elements can be accessed.

The array index is negative.

What is the main difference between an array and an ArrayList?

Arrays can store primitive data types, while ArrayLists can only store objects.

Arrays are more efficient in terms of memory usage compared to ArrayLists.

ArrayLists can change in size dynamically, while arrays have a fixed size once declared. (correct)

ArrayLists can only store one type of data, while arrays can store multiple types.

What is the purpose of the 'binarySearch' method?

To sort the elements in an array in ascending order.

To search for a specific element in a sorted array efficiently. (correct)

To reverse the order of elements in an array.

To randomly shuffle the elements in an array.

Why is a linear search more useful than a binary search to determine the number of occurrences of a number in an array?

Linear search compares each element individually and counts occurrences easily. Signup and view all the answers

How would you determine the size of an array in Java?

By checking the length property of the array. Signup and view all the answers

'Collections.sort()' is a method used to:

Sort elements within an ArrayList in ascending order. Signup and view all the answers

Study Notes

Array and ArrayList Operations

Determine the value of an element at a certain array index
Know how to create 1D and 2D arrays
Know how to create an ArrayList

Sorting and Searching

Use the Arrays class and Collections class to sort arrays
Understand the binarySearch method and how it works
Distinguish between linear search and binary search
Linear search is more useful for determining the number of occurrences of a number in an array

Array Errors and Properties

Understand what it means for an error to be ArrayIndexOutOfBounds
Know how to determine the size of an array

Methods and Classes

Familiarize yourself with the methods found in the Arrays class and their purpose (e.g. sort(), binarySearch(), toString())
Understand the methods found in the Collections class

Recursion and Methods

Understand how recursion works in a program
Know the parts of a method when creating one in programming
Be able to explain how recursion works and provide an example
Be able to calculate the final output when given a recursive function

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Description

This quiz includes questions on determining the value of elements at specific array indexes, creating 1D and 2D arrays along with ArrayLists, sorting arrays using Arrays and Collections classes, error handling for ArrayIndexOutOfBounds, determining array size, and understanding methods in the Arrays Class. It also covers thinking questions related to Java arrays and collections.