Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 *  Copyright 2001-2004 The Apache Software Foundation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

import java.util.HashMap;

import java.util.Map;

public class Main {
    /**
     * Constant to avoid repeated object creation
     */
    private static final Integer INTEGER_ONE = 1;

    /**
     * Returns a {@link Map} mapping each unique element in the given
     * {@link Iterable} to an {@link Integer} representing the number
     * of occurrences of that element in the {@link Iterable}.
     * <p/>
     * Only those elements present in the Iterable will appear as
     * keys in the map.
     *
     * @param iterable the collection to get the cardinality map for, must not be null
     * @return the populated cardinality map
     */
    public static <E> Map<E, java.lang.Integer> getCardinalityMap(final Iterable<E> iterable) {
        Map<E, Integer> count = new HashMap<E, Integer>();
        for (E obj : iterable) {
            Integer c = count.get(obj);
            if (c == null) {
                count.put(obj, INTEGER_ONE);
            } else {
                count.put(obj, c + 1);
            }
        }
        return count;
    }
}