Java Collection Equal containsByEquals(Collection collection, Object obj)

Description

contains By Equals

License

LGPL

Declaration

public static int containsByEquals(Collection collection, Object obj) 

Method Source Code

//package com.java2s;
/*//w ww  .ja v a 2  s .c  om
Strandz LGPL - an API that matches the user to the data.
Copyright (C) 2007 Chris Murphy
    
Strandz LGPL is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
    
This library 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
Lesser General Public License for more details.
    
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
    
    
The authors can be contacted via www.strandz.org
*/

import java.util.Collection;

import java.util.Iterator;

public class Main {
    public static int containsByEquals(Collection collection, Object obj) {
        int result = 0;
        for (Iterator iter = collection.iterator(); iter.hasNext();) {
            Object element = iter.next();
            if (element.equals(obj)) {
                result++;
            }
        }
        return result;
    }

    /**
     * Nearly the same as contains for a list, but works for an array.
     */
    public static int containsByEquals(Object[] comps, Object obj) {
        int result = 0;
        for (int i = 0; i < comps.length; i++) {
            Object element = comps[i];
            if (element.equals(obj)) {
                result++;
            }
        }
        return result;
    }

    /**
     * Saves the hassle of doing the checking for null yourself.
     *
     * @param obj1
     * @param obj2
     */
    public static boolean equals(Object obj1, Object obj2) {
        boolean result = false;
        if (obj1 == null && obj2 == null) {
            result = true;
        } else if (obj1 == null || obj2 == null) {
        } else {
            result = obj1.equals(obj2);
        }
        return result;
    }

    public static boolean equals(boolean b1, boolean b2) {
        return b1 == b2;
    }

    public static boolean equals(int i1, int i2) {
        return i1 == i2;
    }
}

Related

1. allEqual(final Class[] collection, final Class cls)
2. areEqual(Collection collection1, Collection collection2)
3. areEqual(Collection collection1, Collection collection2)
4. compareTwoCollectionsEquality(Collection expectedAffectedFiles, Collection affectedFiles)
5. containsAtleastOneEqualString(Collection left, String right)
6. content_equality(Collection A, Collection B)
7. contentEquals(Collection l1, Collection l2)
8. contentEquals(Collection list1, Collection list2)
9. equal(Collection i1, Collection i2)