List manipulation in java (add,delete,view,modify)

2. Disclaimer: This presentation is prepared by trainees of
baabtra as a part of mentoring program. This is not official
document of baabtra –Mentoring Partner
Baabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt .
Ltd

3. Typing Speed
Week
Target Achieved
1
40
24
2
40
28
3
40
29

4. Jobs Applied
Week
Company
Designation
Applied Date
Current Status
1
Career port
Programmer
6-10-2013
Waiting
2
Poornam info
tech
Software Engineer
30-9-2013
Waiting
3

5. Muhammed Noufal V T
muhammednoufalvt@gmail.c
om
www.facebook.com/vtnoufa
lvt
twitter.com/noufalurnappy
in.linkedin.com/pub/muham
med-noufal
9744003056

6. Kinds of Collections
• Collection—a group of objects, called
elements
– Set—An unordered collection with no
duplicates
– SortedSet—An ordered collection with
no duplicates
– List—an ordered collection, duplicates
are allowed

7. List implementation
• List is an interface; you can’t say new List
()
• There are two implementations:
– LinkedList gives faster insertions and
deletions
– ArrayList gives faster random access
• Syntax:– List list = new LinkedList ( );
– List list = new ArrayList ( );

8. Type Of List
• ArrayList
– Array lists are created with an initial size. When
this size is exceeded, the collection is
automatically enlarged. When objects are removed,
the array may be shrunk.
• LinkedList
– LinkedList uses nodes to hold the elements. These
nodes then point to each other, thus leading to the
name "Linked" List

9. List Operations
• Add
– Syntax
List name.add(item name);
• Delete
– Syntax
List name.remove(item name);
• Display
– Syntax
List name.get(item name);

10. Example

11. Add Operation
public class Add {
static ArrayList <Listbean> data = new ArrayList<Listbean>();
int adddata()
{
Listbean lb =new Listbean();
Scanner li = new Scanner(System.in);
System.out.println("Enter your Item");
lb.setItem(li.next());
System.out.println("Enter your price");
lb.setPrice(li.next());
data.add(lb);
return 0;
}

12. Delete Operation
• int remvdata()
{
System.out.println("Enter the position of item You
want to remove: ");
Scanner rmv = new Scanner(System.in);
int x = rmv.nextInt();
data.remove(x);
return 0;
}

13. Display Operation
• int dispdata()
{
if(data.isEmpty())
System.out.println("The Array is Empty");
else
System.out.println("The Array Elements are: ");
for(int i=0;i< data.size();i++)
{
Listbean beanObj=(Listbean) data.get(i);
System.out.print(beanObj.getItem());
System.out.println("t"+beanObj.getPrice());
}
return 0;
}

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