Java Arrays

Introduction to Arrays

Java Arrays Introduction

In Java arrays  can store a single value in the form of a variable ( for example int x = 10; or String name = “Java”; ). In this way we can store a single element or a value in a variable and we can access that value by calling that variable. What if our requirement needs a 1000 values while programming , creating 1000 variables for those 1000 values will be complex and accessing those 1000 variables in a problem represents hard coded. So Java made it easy with the help of ‘Arrays‘.

Java Array

  • An Array is a container object that holds fixed number of elements of same type.
  • For example   int[]  numbers = new int[10];  here the size of the array is ‘100
  • The length of the array is established when it is created , after creation it’s length is fixed. Here we created an array ‘numbers‘ of length 10. 
  • We can store 10 numbers representing as a single variable “numbers“. 
  • The values are stored in the form of indexes , these indexes are useful to search for a number

java arrays

 

  • Array index starts from 0 to (n-1) , Each item in an array is called ‘element’ and each element is accessed by it’s numerical index .
  • As shown in the figure always the array index starts from 0 , so if we would like to access the 9th element in the ‘numbers‘ array , the 9th element is located in the index value 8.
  • Arrays are of two types One-Dimensional Array and Multi-Dimensional Array
  • A One-Dimensional Array is a list of like-types variables. To create an array , you first must create an array variable of the desired type. The general form of the one-dimensional array is  int[] numbers = new int[10];
  • Multi-Dimensional arrays are actually arrays of arrays. Multi-Dimensional array declaration generally look like  int twoD[][] = new int[4][5];

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