Java List IndexOf indexOfInstance(List list, Class type)

Description

Finds the index of the first element in the given list of the given type.

License

Open Source License

Parameter

Parameter	Description
list	the list to search through.
type	the type to find.

Return

the index of the first element in list that is an instance of type , or -1 if no such element is in list .

Declaration

public static <T> int indexOfInstance(List<T> list, Class<? extends T> type) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Breakout Cave Survey Visualizer/*from   www . j  a v  a  2  s. c  om*/
 *
 * Copyright (C) 2014 James Edwards
 *
 * jedwards8 at fastmail dot fm
 *
 * 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.List;

public class Main {
    /**
     * Finds the index of the first element in the given list of the given type.
     * 
     * @param list
     *            the list to search through.
     * @param type
     *            the type to find.
     * @return the index of the first element in {@code list} that is an instance of {@code type}, or -1 if no such
     *         element is in {@code list}.
     */
    public static <T> int indexOfInstance(List<T> list, Class<? extends T> type) {
        int k = 0;
        for (T t : list) {
            if (type.isInstance(t)) {
                return k;
            }
            k++;
        }
        return -1;
    }
}

Related

1. indexOfId(List aList, Object anObj)
2. indexOfIdentical(List list, Object value)
3. indexOfIdentity(List l, T t)
4. indexOfIgnoreCase(List values, String target)
5. indexOfInstance(List list, Object object)
6. indexOfMax(List list)
7. indexOfMax(List list)
8. indexOfMinSize(final List> sets)
9. indexOfNull(List list)