Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import java.util.*;

public class Main {

    public static <T> T checkAndReturnOnlyElement(Collection<T> collection) {
        if (collection == null || collection.size() == 0) {
            return null;
        } else if (collection.size() != 1) {
            throw new IllegalStateException("collection size is " + collection.size());
        }
        return collection.iterator().next();
    }
}