shift element in ArrayList - Java Collection Framework

Java examples for Collection Framework:Array Element

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Description

shift element in ArrayList

Demo Code

/*/*w  ww . ja  va2s .c o m*/
Holyoke Framework: library for GUI-based database applications
This file Copyright (c) 2006-2008 by Robert Fischer

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
//package com.java2s;
import java.util.*;

public class Main {
    public static void shift(ArrayList al, int ix, int n, int shift) {
        //   int oldsize = al.size();
        //   int lastix = ix + n + shift;   // last index (+1) of last item being shifted
        if (shift > 0) {
            //      while (al.size() < lastix) al.add(null);   // potentially add...
            for (int i = n - 1; i >= 0; --i)
                al.set(ix + i + shift, al.get(ix + i));
        } else {
            for (int i = 0; i < n; ++i)
                al.set(ix + i + shift, al.get(ix + i));
        }
    }

    public static void shift(ArrayList al, int ix, int shift) {
        int n = al.size() - ix;
        if (shift > 0)
            n -= shift;
        shift(al, ix, n, shift);
    }
}

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