Main.java Source code

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Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Apache License 

import java.util.List;
import java.util.Locale;

public class Main {
    /**
     * Compares two lists. Caution: Lists can hold same values multiple times.
     * 
     * @param list1
     * @param list2
     * @return -1 if no common elements or any of lists are empty/null.
     *          0 if two lists have the same contents.
     *          x (x>0) if there are x elements in common. 
     */

    public static int compareLists(List<? extends Object> list1, List<? extends Object> list2) {
        if (null == list1 || null == list2 || list1.isEmpty() || list2.isEmpty()) {
            return -1;
        }

        int count = 0;

        for (Object o : list1) {
            if (list2.contains(o))
                count++;
        }

        return count;

    }

    /**
     * Check if the list contains the member. For objects, it uses standard .equals() method. 
     * For strings, it compares but ignores the case.
     * 
     * @param list
     * @param member
     * @return
     */

    public static boolean contains(List<? extends Object> list, Object member) {
        if (list.isEmpty() || member == null)
            return false;

        for (Object obj : list) {
            if (obj instanceof String && member instanceof String) {
                if (compareIgnoreCase((String) obj, (String) member))
                    return true;
            } else {
                if (member.equals(obj))
                    return true;
            }
        }

        return false;
    }

    public static boolean compareIgnoreCase(String str1, String str2) {
        return str1.toLowerCase(Locale.ENGLISH).equals(str2.toLowerCase(Locale.ENGLISH));
    }
}