Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import java.util.Collection;

import java.util.HashSet;

import java.util.Set;

public class Main {
    /**
     * Tests if two collections have the same elements without considering the order
     * 
     * @param collection1
     * @param collection2
     * 
     * @return true if both collections have the same elements or both collections are null or empty, fasle otherwise
     */
    public static boolean elementsEqual(final Collection<?> collection1, final Collection<?> collection2) {
        if (collection1 == null && collection2 == null) {
            return true;
        } else if (collection1 == null) {
            return false;
        } else if (collection2 == null) {
            return false;
        } else if (collection1 == collection2) {
            return true;
        } else {
            final int size1 = collection1.size();
            final int size2 = collection2.size();
            if (size1 != size2) {
                return false;
            } else {//size1 == size2
                final Set<Object> set2 = new HashSet<Object>(collection2);
                for (final Object objectOfCollection1 : collection1) {
                    if (!set2.contains(objectOfCollection1)) {
                        return false;
                    }
                }
                return true;
            }
        }
    }
}