ARRAYS IN JAVA

Arrays in Java are data structures that store multiple values of the same type in a single variable. They are fixed in size and can be accessed using an index, starting from 0. Arrays are useful for organizing and managing collections of data efficiently.

In Java, arrays are declared using square brackets [] after the data type. For example, to declare an array of integers, you would write int[] numbers;. You can also initialize an array with values using curly braces {}. For example, int[] numbers = {1, 2, 3, 4, 5};.

To access an element in an array, you use the index of the element inside square brackets. For example, to access the first element of the numbers array, you would write numbers[0].

Arrays in Java have a fixed size, which means that you need to specify the number of elements when you declare an array. Once an array is created, its size cannot be changed. If you need a collection that can grow or shrink in size, you should use a List instead.

Here are some common operations you can perform with arrays in Java:

• Accessing elements: You can access elements in an array using their index.
• Modifying elements: You can modify the value of an element in an array by assigning a new value to it.
• Iterating over elements: You can use a loop to iterate over all the elements in an array.
• Finding the length: You can find the number of elements in an array using the length property.
• Sorting elements: You can sort the elements in an array using the Arrays.sort() method.

There are also dynamic arrays in Java

Vectors which grow by 100% of the size of the array when the array is full. Array List which grows by 50% of the size of the array when the array is full.