How to delete a particular thing from a list?

Question

For the implementation of an algorithm,I need to delete a particular value from the list.

Eg:---

My list:---

     Ist row->4,7,3,4

     IInd row->2,8,6,5

     IIIrd row->3,5,1,7

Before delete some values,I need to sort it.That is,

     Collections.sort(list);

Sorted Result

     2,8,6,5

     3,5,1,7

     4,7,3,4

Expected OUTPUT Now I need to delete 1st elements of all rows. The output is

How I do this???I tried it by using tokenizer method,but I don't get it.

are you maybe looking for something like this? http://stackoverflow.com/questions/8452672/java-howto-arraylist-push-pop-shift-and-unshift — erik258, Mar 05 '14 at 04:19
@Dahlia..can u provide more code of how you are storing your list ? — Kamlesh Arya, Mar 05 '14 at 04:24

aliteralmind · Accepted Answer · 2014-03-05T12:06:20.400

2

You can remove the first element from a java.util.List with

myList.remove(0);

To eliminate the first space delimited word (or number) from a string, use:

s = s.substring((s.indexOf(" ") + 1), s.length());

Note that this will fail if the string is null, or does not contain a space.

You can protect against this with

if(str == null || str.indexOf(" ") != -1)  {
   throw  new IllegalArgumentException("str (" + str + ") must be non-null, and must contain a space.");
}
//Safe!
str = str.substring((str.indexOf(" ") + 1), str.length());

edited Mar 05 '14 at 12:06

answered Mar 05 '14 at 04:19

aliteralmind

19,847
17
77
108

It is deleting the Ist row.I need to delete a particular value from the row,not the entire row. – Dahlia Mar 05 '14 at 04:23
1

Updated again. Thank you for the up-vote and acceptance! – aliteralmind Mar 05 '14 at 04:40

score 1 · Answer 2 · answered Mar 05 '14 at 04:21

1

You just delete the list item at zero position... Like this

 ListVariable.remove(0);

For the every First element means Use for loop... Just get the Rows...

for(int i =0 ; i<ListVariable.size() ; i+4 )
{
      ListVariable.remove(i);
}

answered Mar 05 '14 at 04:21

Naveen Kumar Kuppan

1,424
1
10
12

How to delete a particular thing from a list?

2 Answers2