Introduction To Array

Array :

Array is an basic data structure used to store a collection of elements sequentially.

Elements in an array can be accessed randomly because elements in array can be identified by array index.

We have one dimensional array and multi-dimensional array.

One dimensional array is known as Linear array.

Example :

Here , we can access 2 as num[0] , 6 as num[3]

Operations in Array :

Initialize 

Length of an array 

Access an Element 

Iterate all the Elements 

Modify Elements

Sort

// Example :

package com.techyield.operationsinarray;

import java.util.Arrays;

public class OperationsinOneDimensionalArray {

public static void main(String[] args) {

//Intialize

int [] array1 = new int[5];

int [] array = {1,2,3,4,5,6};

// Getting Length

System.out.println("The Size of array1 is "+array1.length);

System.out.println("The Size of array2 is "+array.length);

// Access 4th element  in array2

System.out.println("The 4th element in array"+array[3]);

// Iterate all the elements in array

// First Version

System.out.println("Fetching elements using for loop");

for(int i =0; i < array.length; i++) {

System.out.println(" "+array[i]);

}

System.out.println();

System.out.println("Fetching elements from array using forEach ");

for(int k : array) {

System.out.println(" "+k);

}

System.out.println();

// Modify Elements 

System.out.println("Modify 3rd ELement in array ");

array[2]= 9;

for(int p : array) {

System.out.println(" "+p);

}

System.out.println(" Sort the Elements");

// Sort the Elements

Arrays.sort(array);

for(int u = 0; u < array.length;u++)

System.out.println(" "+array[u]);

 

}

}

// Output :

The Size of array1 is 5

The Size of array2 is 6

The 4th element in array4

Fetching elements using for loop

 1

 2

 3

 4

 5

 6

Fetching elements from array using forEach 

 1

 2

 3

 4

 5

 6

Modify 3rd ELement in array 

 1

 2

 9

 4

 5

 6

 Sort the Elements

 1

 2

 4

 5

 6

 9