The List interface extends Collection and declares the behaviour of a collection that stores a sequence of elements.

·     Elements can be inserted or accessed by their position in the list, using a zero-based index.

·     A list may contain duplicate elements.

·     In addition to the methods defined by Collection.

·     Several of the list methods will throw an UnsupportedOperationException if the collection cannot be modified, and a ClassCastException is generated when one object is incompatible with another. 

 We can define List data type which data type will be store in the list.

I.e.

List<String> myList=new ArrayList( );
// store only String type value
myList.add(" Data1");
myList.add(" Data2");
myList.add(" Data3");
or 
List mList=new ArrayList( );
// store any type value
 
mList.add(" Data1");
mList.add(" Data2");
mList.add(" Data3");

 

In List class we can add several types of data but List<e> interface we can add only e type data for example

List mList=new ArrayList( );
mList.add(" Data1");
mList.add(123);
mList.add('C');
mList.add(3.63);

Insert value in list

Syntax -:listObj.add(Value);

  myList.add("MyData"); 

Update value in particular index

Syntax -:listObj.set(int index, Value;

 myList.set(4, "Update"); 

Find value from index

Syntax-: listobj.get(int index);

 myList.get(2); 

Remove value from index

Syntax-: listobj.remove(int index);
 myList.remove(2); 

Get index of Object

Syntax-: listobj.indexOf(Object);
int index=myList.indexOf("Data2");
If record found then return index position otherwise return -1. 

Here I am creating example if List sample for insert, manipulation, deletion etc.

import java.util.ArrayList;
import java.util.List;
 
public class Demo {
     static List<String> myList;
 
     public static void main(String args[]) {
 
           myList = new ArrayList<String>();
           // insertData("Data1");
 
           for (int i = 1; i < 11; i++) {
                insertData("Item" + i);
 
           }
           updateList("Data10", 10);
           DeleteByData("Data10");
           DeleteByIndex(9);
           System.out.print(myList.toString());
 
     }
 
     public static void insertData(String data) {
           myList.add(data);
           // System.out.println("Data Inserted.");
 
     }
 
     public static void updateList(String data, int index) {
           index = index - 1;
           if (index < myList.size()) {
                myList.set(index, data);
                System.out.println("Data Updated.");
           } else
    System.out.println("You have not enough data index for update.");
     }
 
     public static void DeleteByIndex(int index) {
           index = index - 1;
           if (index < myList.size()) {
                myList.remove(index);
                System.out.println("Data Deleted.");
           } else
 System.out.println("You have not enough data index for delete.");
 
     }
 
     public static void DeleteByData(String data) {
           int index = myList.indexOf(data);
           if (index >= 0) {
                myList.remove(index);
                System.out.println("Data Deleted.");
           } else
                System.out.println("Data not found for delete.");
     }
}
 

Output