6 Questions
What does the error 'ArrayIndexOutOfBounds' indicate?
The array index being referred to is outside the bounds of the array.
What is the main difference between an array and an ArrayList?
ArrayLists can change in size dynamically, while arrays have a fixed size once declared.
What is the purpose of the 'binarySearch' method?
To search for a specific element in a sorted array efficiently.
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.
How would you determine the size of an array in Java?
By checking the length property of the array.
'Collections.sort()' is a method used to:
Sort elements within an ArrayList in ascending order.
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
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.
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