Java Concept

Array List: Insertion and Deletion Mechanism

Code:

/*

 * This is a simple program that enable dynamic deletion and.

 * insertion of data element from and into an array object.

 */

package arraydatastructure;

import java.util.Arrays;

/**

 *

 * @author Adeniran Adetunji

 */

public class Insert_Delete_from_Array {

    

//This method delete element at position 'pos' from and array 'data'

 public int [] deleteElement (int[]data, int pos)

{

    //check if postion 'pos' is within the length of the array

    

    if(pos >= 0 && pos <data.length)

{

            

    int[] dataCopy = new int[data.length-1];

    

   

    System.arraycopy (data, 0, dataCopy, 0, (pos-1));

    

    System.arraycopy(data, pos,dataCopy, pos-1, 
                      dataCopy.length-(pos-1));

    

    data=dataCopy;

    

       

    }

    return data;

    }

     

 //Method to insert data element into an array

    public int [] InsertElement (int[]dataA,int data, int pos)

{

    

    if(pos >= 0 && pos <dataA.length)

    {

        

         int[]dataCopy= new int[dataA.length+1];

    

     //adding element to array

    

    System.arraycopy(dataA, 0, dataCopy, 0, pos-1);

    

    dataCopy[pos-1] = data;

    

    System.arraycopy(dataA, pos-1, dataCopy, pos, 
                     dataA.length-(pos-1));

    

    dataA = dataCopy;

    }

    

    return dataA;

  

}

  // Testing the methods in the 'main' method

      public static void main(String args[]) {

          

          //creating array 'a' with data 1,2,3,4,5,6,7,8,9,10

          int[]a = {1,2,3,4,5,6,7,8,9,10};

          

          //converting array 'a' to string and print

          System.out.println(Arrays.toString(a));

          

          //creating and object of the type Insert_Delete_from_Array

          

          Insert_Delete_from_Array obj = new                                   Insert_Delete_from_Array();

          

          //delet element at postion 7 from array a

          a = obj.deleteElement(a, 7);

          

          //Convert array 'a' to string and print

          System.out.println(Arrays.toString(a));

          

          //insert '21' into postiont '8' in array 'a'

          a = obj.InsertElement(a, 21, 8);

          

          System.out.println(Arrays.toString(a));

          

          

      }

}

Output:

run:

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

[1, 2, 3, 4, 5, 6, 8, 9, 10]

[1, 2, 3, 4, 5, 6, 8, 21, 9, 10]

BUILD SUCCESSFUL (total time: 9 seconds)