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Array in Java,What is Array,Array Tutorials in Java,Array Concept in Java,Single Dimension Array,Jagged Array,Multidimension array

Array in Java,What is Array,Array Tutorials in Java,Array Concept in Java,Single Dimension Array,Jagged Array,Multidimension array.

Array:-  It is the collection of similar type of elements  which can store multiple values using single variable.Array provide unique index to store element ,base index of array will be started from 0 to size-1.

Advantage of array:-

1)  We can easily search and sort the element from array because array store element using proper sequence.
2)  We can store multiple values using single variable in array ,using this we can reduce space complexity of program.

3)  We can reduce extra memory gap of normal variable because array type variable provide contiguous memory allocation .


Disadvantage of Array:-

1) Size is mandatory to store data in array. it can not manage infinite data.

2)  We can store only similar type of elements except Object type array.

Type of array:-

1)  Single Dimension Array:-   We can store elements using row ,single dimension array base index will be started from 0 to size-1. it is also called Flatten array


Datatype arrayname[] = new Datatype[size];

int arr[] = new int[5];

float arr[] = new int[5];

Datatype arrayname[] = {value1,value2,value3,...}

int arr[]  = {101,102,103,104,105};

for(int i=0;i<arr.length;i++)
{
    System.out.println(arr[i]);

}


Q1)  WAP to calculate sum of array elements?

Q2)  WAP to find max element in array?
   
class Arrmax
{
   public static void main(String args[])
   {
       int arr[] = {11,23,45,78,21,89,2};
       int max=arr[0];
       for(int i=1;i<arr.length;i++)
       {
           if(max<arr[i])
             max=arr[i];

       }
       System.out.println(max);


   }




}



Q3)  WAP to reverse array elements?


class Arrrev
{
   public static void main(String args[])
   {
       int arr[] = {11,45,78,89,2};
   
       for(int i=arr.length-1;i>=0;i--)
       {
           System.out.println(arr[i]);

       }
     


   }




}

Q4)  WAP to display only prime elements in array?

class Arrrev
{
   public static void main(String args[])
   {
       int arr[] = {11,45,78,89,2};
   
       for(int i=0;i<arr.length;i++)
       {
           int num=arr[i];
           int count=0;
           for(int j=1;j<=num;j++)
           {
                  if(num%j==0)
                   count++;

           }
           if(count==2)
           System.out.println(num);       

       }
     


   }




}

.......................................................................................................................................

 WAP to manage input operation in Array?
...................................................................................................................................................

import java.util.Scanner;
class Arrrev
{
   public static void main(String args[])
   {
       Scanner sc = new Scanner(System.in);
       System.out.println("enter size of array");
       int size=sc.nextInt();
       int arr[] = new int[size];
       for(int i=0;i<size;i++)
       {
           arr[i]=sc.nextInt();

       }
      System.out.println("array elements is");
      for(int i=0;i<size;i++)
       {
           System.out.println(arr[i]);

       }
     
   
     


   }




}



Array another article:-


https://www.shivatutorials.com/2019/09/array-concept-in-java.html

2) Multidimensional Array





3) Jagged Array


4) Object Array

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