Java List to Int List toIntList(List list)

Description

to Int List

License

Open Source License

Declaration

public static List<Integer> toIntList(List<String> list) 

Method Source Code

//package com.java2s;
/**/*from  ww w.  j av a2 s .c  o  m*/
 * Copyright (c) 2001-2002. Department of Family Medicine, McMaster University. All Rights Reserved.
 * This software is published under the GPL GNU General Public License.
 * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * This software was written for the
 * Department of Family Medicine
 * McMaster University
 * Hamilton
 * Ontario, Canada
 */

import java.util.ArrayList;

import java.util.List;

public class Main {
    private static final Integer ZERO_INT = new Integer(0);

    public static List<Integer> toIntList(List<String> list) {
        List<Integer> result = new ArrayList<Integer>();
        for (String str : list) {
            result.add(fromIntString(str));
        }
        return result;
    }

    /**
     * Parses the specified string as an Integer instance. 
     * 
     * @param obj
     *       String to be parsed as integer
     * @return
     *       Returns the parsed integer
     */
    public static Integer fromIntString(Object obj) {
        String intString = (obj == null) ? null : obj.toString();
        if (intString == null || intString.trim().isEmpty()) {
            return ZERO_INT;
        }
        try {
            return Integer.parseInt(intString);
        } catch (Exception e) {
            return 0;
        }
    }
}

Related

1. toIntegerList(int[] array)
2. toIntegerList(int[] intArray)
3. toIntegerList(List strList, boolean failOnException)
4. toIntegers(final List longs)
5. toIntegers(List values)
6. toIntList(Set members)
7. toIntList(String arr, String separator)
8. toInts(List list)