Java Array to ArrayList toArrayList(String str)

Declaration

public static ArrayList<Integer> toArrayList(String str) 

Method Source Code

//package com.java2s;
/**/*from  w w  w  . ja  va2s . co m*/
 * Copyright (C) 2013-2016
 * Jeffrey Fulmer - <jeff@joedog.org>, et al.
 *
 * 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 2 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, write to the Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *--
 */

import java.util.ArrayList;

public class Main {
    /**
     * Parses a formated string and returns an array. The string must
     * be formatted in the following manner: {n,n} or (n,n) or [n,n,n]
     * The array's size will be determined automatically based on the 
     * number of comma separated tokens inside the brackets.
     * <p>
     * @param  String  A formated string, i.e., (23,12,12,3)
     * @return ArrayList<Integer>
     */
    public static ArrayList<Integer> toArrayList(String str) {
        int[] tmp = toArray(str);
        ArrayList<Integer> list = new ArrayList<Integer>();
        for (int i = 0; i < tmp.length; i++) {
            list.add(tmp[i]);
        }
        return list;
    }

    /**
     * Parses a formated string and returns an array. The string must
     * be formatted in the following manner: {n,n} or (n,n) or [n,n,n]
     * The array's size will be determined automatically based on the 
     * number of comma separated tokens inside the brackets.
     * <p>
     * @param  String  A formated string, i.e., (23,12,12,3)
     * @return int[]
     */
    public static int[] toArray(String str) {
        if (str == null && !str.matches("\\(.*|\\{.*|\\[.*")) {
            System.err.println("ERROR: Format should match: {n,n} (n,n) or [n,n]");
            return null;
        }

        String[] tmp = str.split(",");
        int size = tmp.length;

        if ((str = str.replaceAll("\\s", "")).length() < 2 * size + 1) {
            System.err.println("ERROR: Parsed length is too short: " + str.length());
            return null;
        }

        String[] tokens = (str = str.substring(1, str.length() - 1)).split(",");

        int[] ret = new int[tokens.length];
        try {
            for (int i = 0; i < size; ++i) {
                ret[i] = Integer.parseInt(tokens[i]);
            }
        } catch (NumberFormatException ex) {
            return null;
        }
        return ret;
    }
}

Related

1. toArrayList(final T... array)
2. toArrayList(int[] p)
3. toArrayList(int[] values)
4. toArrayList(List list)
5. toArrayList(Object pObject)
6. toArrayList(String[] ss)
7. toArrayList(T... items)
8. toArrayList(T[] vals)
9. toArrayListArr(ArrayList al)