Java List Count count(List l, int from, int to, Object what)

Description

count the number of occurences in a list

License

Open Source License

Declaration

public static int count(List l, int from, int to, Object what) 

Method Source Code

//package com.java2s;
/*//ww w  .  ja v  a2s  . c o  m
 * This file is part of the Jose Project
 * see http://jose-chess.sourceforge.net/
 * (c) 2002-2006 Peter Sch?fer
 *
 * 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.
 *
 */

import java.util.List;

public class Main {
    /**
     * count the number of occurences in a list
     */
    public static int count(List l, int from, int to, Object what) {
        int result = 0;
        while (from < to) {
            Object which = l.get(from++);
            if (equals(which, what))
                result++;
        }
        return result;
    }

    public static final boolean equals(int flags, int mask, int value) {
        return (flags & mask) == value;
    }

    /** compare two object for equality with equals(). null values accepted */
    public static final boolean equals(Object a, Object b) {
        if (a == b)
            return true;
        if (a == null || b == null)
            return false;
        return a.equals(b);
    }
}

Related

1. count(List values)
2. count(List lines)
3. countAtLevel(List aList, int aLevel)
4. countNumber(List list, int number)