ArrayList

import java.util.ArrayList; public class AraryListDemo { public static void main(String[] args) { ArrayList al = new ArrayList(); System.out.print("Initial size of al : " + al.size()); System.out.print("\n"); //add.elements to the array list al.add("C"); al.add("A"); al.add("E"); al.add("B"); al.add("D"); al.add("F"); al.add(1,"A2");//inserts objects "A2" into array at index 1 System.out.print("size of al after additions " + al.size()); System.out.print("\n"); //display the array list System.out.print("contents of al: " + al ); System.out.print("\n"); //Remove elements from the array list al.remove("F"); al.remove(2); System.out.print("size of after deletions : " + al.size()); System.out.print("\n"); System.out.print("contents of al:" + al); } }


Initial size of al: 0
size of al after additions 7
contents of al: [C, A2, A, E, B, D, F]
size of after deletions : 5
contents of al:[C, A2, E, B, D] [1, 2, 3, 4]

May you explain about this output:
[1, 2, 3, 4]

abalfazl hossein wrote:...
May you explain about this output:
[1, 2, 3, 4]

I have no idea. That does not appear when I run your code.

marc weber wrote:

abalfazl hossein wrote:...
May you explain about this output:
[1, 2, 3, 4]

I have no idea. That does not appear when I run your code.

Yup, It doesn't appear to me either...

abalfazl , have you posted the same code which you are running?
Looks like there was a System.out.print statement after line 33 which prints another list.
You might have removed that statement and then directly ran it (but forgot to compile the modified code before running it).

Also,
System.out.print("Initial size of al : " + al.size()); System.out.print("\n");

You can use a single statement System.out.println("Initial size of al : " + al.size()); instead of the above two statements.

println() adds a line separator et the end of the output automatically.