Array

A similar data type element may be found in a Java array. An array's elements are kept in a single, continuous memory space.We store related components in a data structure. A Java array is limited to a set number of items. Array in Java is index-based; the first element of the array is stored at the 0th index, 2nd element is stored on the 1st index, and so on. Unlike C/C++, we can get the array's length using the length member. In C/C++, we need to use the sizeof operator.

In Java, an array is an object of a dynamically generated class. Java array inherits the Object class and implements the Serializable and Cloneable interfaces. In Java, a primitive value or an object can be stored in an array.Java allows us to build single-dimensional or multidimensional arrays, just like C/C++.

An array is a container that collects similar values in a single variable. In an array, data is stored at a fixed size with sequential. It declares a separate variable value. A new keyword can be used to build an array. The oracle claims that arrays are dynamically formed objects and may be assigned to a variable of the type object. All array elements write in { } curly brackets, and the index writes in [ ] square brackets. Array belongs to java.util package.

Example:

 int[ ] key;

int key [ ]; // a legal but undesirable space after the name

An array of some advantages:-

• Arrays represent multiple data items of similar type.

• An index number can be used to access the element.

• Array memory allocates continuously. There is not chance to use extra memory

• Easy manipulation and storage of large amounts of data   

Disadvantages

• Size Limit: We can store only the fixed size of elements in the array. It doesn't grow its size at runtime. The solution above given problem a collection framework is used in Java which grows automatically.

There are two types:

1. Single dimensional array

2. Double dimensional array