Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import java.util.Collection;

public class Main {
    public static <T> T single(Collection<T> cl, boolean force) {
        return single(cl, force, null);
    }

    public static <T> T single(Collection<T> cl, boolean force, Object msg) {
        String amsg = msg == null ? "" : "," + msg.toString();
        if (cl.isEmpty()) {
            if (force) {
                throw new RuntimeException("force:" + cl + amsg);
            } else {
                return null;
            }
        } else if (cl.size() > 1) {
            throw new RuntimeException("tomuch:" + cl + amsg);
        } else {
            return cl.iterator().next();
        }
    }
}