Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Open Source License 

import java.util.Collection;
import java.util.HashSet;

import java.util.Set;

public class Main {
    /**
     * Returns true if every element in a collection are unique by {@link Object#equals(Object)}.
     */
    public static boolean elementsAreUnique(Collection<?> items) {
        final Set<Object> testSet = new HashSet<>();
        for (Object item : items) {
            final boolean itemAlreadyExists = !testSet.add(item); // see Set documentation
            if (itemAlreadyExists) {
                return false;
            }
        }
        return true;
    }
}