linkedhashmap

I have function which return LinkedHashMap in Struts2 and i just came to know that we cannot use for loop in struts2 instead we have to use Iterators, and am new to struts can any on help me to retrieve value from linkedhashmap using iterators, below is how values are lined up in hashmap: LinkedHashMap<String, ArrayList<String>> topSuppliers = new LinkedHashMap<String, ArrayList<String>>(); while(resultset.next()){ ArrayList<String> innerList = new ArrayList<String>(); String manufId = resultset.getString("manufacturer_id"); String manufLogo = resultset.getString("SUPPLIER_LOGO_IMAGE"); String

This question already has an answer here: Iterating through a Collection, avoiding ConcurrentModificationException when removing objects in a loop 23 answers I have a method test(), in which I am trying to compare two LinkedHashMaps against each other and modify the contents of one of the maps by removing the key/value pair if it is found in both LHM's. I keep getting a ConcurrentModificationException when running this method. I understand WHY I am getting the exception (since I am trying to modify the list that is being looped over). I'm not sure how to go forth with this however. I have this

In SQL Server database I have a table which has three columns namely Ref_Name,Ref_from and Ref_to.Now I want a dropdown list to hold values row-wise i.e all column values of the row should be in the dropdown list in following way:- Reference-1(2014-10-10 07:17:00.000 to 2014-10-10 08:46:00.000) Reference-2(2014-09-01 10:00:00.000 to 2014-09-01 11:00:00.000) For this I have used LinkedHashMap as:- public LinkedHashMap<String, List<String>> connect() { ArrayList<String> list = new ArrayList<String>(); try { con = getConnection(); stmt = con.createStatement(); String sql="select Ref_No,From_Date

1. Map概览 Java SE中有四种常见的Map实现——HashMap, TreeMap, Hashtable和LinkedHashMap。如果我们使用一句话来分别概括它们的特点，就是： HashMap就是一张hash表，键和值都没有排序。 TreeMap以红-黑树结构为基础，键值按顺序排列。 LinkedHashMap保存了插入时的顺序。 Hashtable是同步的(而HashMap是不同步的)。所以如果在线程安全的环境下应该多使用HashMap，而不是Hashtable，因为Hashtable对同步有额外的开销。 HashMap 如果HashMap的键(key)是自定义的对象，那么需要 按规则定义它的equals()和hashCode()方法 。 class Dog { String color; Dog(String c) { color = c; } public String toString(){ return color + " dog"; } } public class TestHashMap { public static void main(String[] args) { HashMap hashMap = new HashMap(); Dog d1 = new Dog("red"); Dog d2 = new Dog("black"); Dog d3

This is the first time that I have to order an HashMap in Java. I need to do that by key but in my case the key is an object so I need to order by a specific field. Trying to figure it by my own I've considered to proceed with this simple scratch of code: private HashMap<SimpleDBField, String> sortTable(HashMap<SimpleDBField, String> row){ LinkedHashMap<SimpleDBField, String> orderedRow = new LinkedHashMap<SimpleDBField, String>(); for(int i = 1; i <= row.size(); i ++){ Iterator iterator = row.entrySet().iterator(); while(iterator.hasNext()){ Map.Entry<SimpleDBField, String> entry = (Map.Entry

I had a need for having Key/Value pairs in the order of my insertion, so I opted to use LinkedHashMap over HashMap . But I need to convert the LinkedHashMap into a JSON String where the order in the LinkedHashMap is maintained in the string. But currently I'm achieving it by: First converting the LinkedHashMap into JSON. Then converting the JSON into a string. import java.util.LinkedHashMap; import java.util.Map; import org.json.JSONObject; public class cdf { public static void main(String[] args) { Map<String,String > myLinkedHashMap = new LinkedHashMap<String, String>(); myLinkedHashMap.put(