All Flashcards
What is the definition of Array?
A container object that holds a fixed number of values of a single type.
What is the definition of Index?
The position of an element within an array, starting from 0.
What is the definition of Traversing an array?
The process of visiting each element in an array and performing some operation on it.
What is the definition of ArrayIndexOutOfBoundsException?
An exception thrown when trying to access an array element with an invalid index (e.g., negative or beyond the array's length).
What is the definition of Enhanced For Loop?
A simplified for loop for iterating over elements in an array without needing to manage indices directly.
What is the definition of Zero-based indexing?
A system where the first element of an array has an index of 0, the second has an index of 1, and so on.
What is the definition of NullPointerException?
An exception thrown when attempting to use a reference that points to null (no object).
What is the definition of Data Structure?
A way of organizing and storing data in a computer so that it can be used efficiently.
What is the definition of Primitive Data Type?
Basic data types such as int, boolean, and double that are built into a programming language.
What is the definition of Reference Data Type?
Data types that store the memory address of an object, such as String and arrays.
What is array initialization?
Assigning an initial size and optionally values to the elements of an array when it is created.
What is the significance of array indices?
Array indices provide a way to access and manipulate individual elements within the array.
What is array traversal?
Iterating through each element of the array to perform an operation.
Why is it important to avoid ArrayIndexOutOfBoundsException?
Accessing an invalid index can lead to program crashes or unexpected behavior.
How does the enhanced for loop simplify array processing?
It provides a concise way to iterate through array elements without managing indices, but it can't modify the array.
What happens if an array is created but not explicitly populated with values?
The elements of the array will be initialized with the default values for their type (e.g., 0 for int, false for boolean, null for objects).
Why are arrays fixed in size?
Arrays are fixed in size to ensure memory allocation is contiguous and efficient, which allows for fast access to elements.
What is the purpose of using loops with arrays?
Loops allow for efficient processing of each element in an array, such as modifying values, searching for specific elements, or performing calculations.
What are some common array algorithms?
Finding min/max values, computing sums/averages, determining if elements meet certain criteria, shifting/rotating elements, and reversing order.
What are the limitations of enhanced for loops?
They cannot be used to modify the original array, and they do not provide access to the index of the elements.
What are the differences between a for loop and an enhanced for loop when traversing arrays?
For Loop: Requires managing indices, can modify array elements. | Enhanced For Loop: Simpler syntax, cannot modify array elements, no index access.
What are the differences between primitive type arrays and object type arrays?
Primitive Type Arrays: Store actual values, default values are 0/false. | Object Type Arrays: Store references, default value is null.
What are the differences between 1D and 2D arrays?
1D Arrays: Single row of elements. | 2D Arrays: Multiple rows and columns of elements.
What are the differences between Arrays and ArrayLists?
Arrays: Fixed size, primitive data types and objects. | ArrayLists: Dynamic size, objects only.
What are the differences between initializing an array with default values and initializing it with specific values?
Default Values: Elements are set to default values (0, false, null). | Specific Values: Elements are assigned specific values upon creation.
What are the differences between accessing an array element using a valid index and an invalid index?
Valid Index: Returns the value at that index. | Invalid Index: Throws an ArrayIndexOutOfBoundsException.
What are the differences between shifting elements left and shifting elements right in an array?
Shifting Left: Elements move towards the beginning of the array. | Shifting Right: Elements move towards the end of the array.
What are the differences between determining the minimum value and the maximum value in an array?
Minimum Value: Find the smallest element. | Maximum Value: Find the largest element.
What are the differences between determining if at least one element meets a criteria and determining if all elements meet a criteria?
At Least One: Stop iterating when one element meets the criteria. | All Elements: Iterate through all elements to ensure all meet the criteria.
What are the differences between reversing an array in place and creating a new reversed array?
In Place: Modifies the original array. | New Array: Creates a new array with the reversed elements, leaving the original array unchanged.