Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import java.util.Collection;

import java.util.LinkedHashMap;

import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

public class Main {
    public static Integer firstUnique(Collection<Integer> collection) {
        Map<Integer, Integer> linkedHashMap = new LinkedHashMap<Integer, Integer>();
        java.util.Iterator<Integer> it = collection.iterator();
        Integer currentInt;
        java.util.Iterator it1;
        Set entrySet;
        Map.Entry<Integer, Integer> me;

        while (it.hasNext()) {
            currentInt = it.next();
            if (!linkedHashMap.containsKey(currentInt)) {
                linkedHashMap.put(currentInt, 1);
            } else {
                linkedHashMap.put(currentInt, linkedHashMap.get(currentInt) + 1);
            }
        }

        entrySet = linkedHashMap.entrySet();
        it1 = entrySet.iterator();
        while (it1.hasNext()) {
            me = (Entry) it1.next();
            if (me.getValue().equals(1)) {
                return (Integer) me.getKey();
            }
        }

        return null;
    }
}