duplicates

问题 I have a map with duplicate values: ("A", "1"); ("B", "2"); ("C", "2"); ("D", "3"); ("E", "3"); I would like to the map to have ("A", "1"); ("B", "2"); ("D", "3"); Do you know how to get rid of the duplicate values? At present, I get 'java.util.ConcurrentModificationException' error. Thank you. public static void main(String[] args) { HashMap<String, String> map = new HashMap<String, String>(); map.put("A", "1"); map.put("B", "2"); map.put("C", "2"); map.put("D", "3"); map.put("E", "3"); Set

问题 i have an array which might contain duplicate elements(more than two duplicates of an element). I wonder if it's possible to find and remove the duplicates in the array: without using Hash Table (strict requirement) without using a temporary secondary array. No restrictions on complexity. P.S : This is not Home work question Was asked to my friend in yahoo technical interview 回答1: Sort the source array. Find consecutive elements that are equal. (I.e. what std::unique does in C++ land). Total

问题 Is there a way to suppress duplicated messages on a queue defined on ActiveMQ server? I tried to define manually JMSMessageID, (message.setJMSMessageID("uniqueid")), but server ignores this modification and deliver a message with built-in generated JMSMessageID. By specification, I didn't found a reference about how to deduplicate messages. In HornetQ, to deal with this problem, we need to declare the HQ specific property org.hornetq.core.message.impl.HDR_DUPLICATE_DETECTION_ID on message

问题 As part of a project I'm working on, I'd like to clean up a file I generate of duplicate line entries. These duplicates often won't occur near each other, however. I came up with a method of doing so in Java (which basically made a copy of the file, then used a nested while-statement to compare each line in one file with the rest of the other). The problem, is that my generated file is pretty big and text heavy (about 225k lines of text, and around 40 megs). I estimate my current process to

问题 I am trying to figure out how to remove all unique rows, from a data frame, but if it has a duplicate, I want that to stay in. For Example - I want all columns from this with col1 the same: df<-data.frame(col1=c(rep("a",3),"b","c",rep("d",3)),col2=c("A","B","C",rep("A",3),"B","C"),col3=c(3,3,1,4,4,3,2,1)) df col1 col2 col3 1 a A 3 2 a B 3 3 a C 1 4 b A 4 5 c A 4 6 d A 3 7 d B 2 8 d C 1 subset(df,duplicated(col1)) col1 col2 col3 2 a B 3 3 a C 1 7 d B 2 8 d C 1 But I want to have rows 1,2,3,6,7

问题 ok, so I have an object like: var myobject = { "field_1": "lorem ipsum", "field_2": 1, "field_2": 2, "field_2": 6 }; as you see there are duplicate names in the object, but with different values. If i go through it like (using jQuery): $.each(myobject, function(key, value) { console.log(key); console.log(myobject[key]); console.log(myobject[value]); } key - returns the correct key myobject[key] - returns the name for that key myobject[value] - returns the last elements', with that name, value

问题 I'm trying to debug a portion of code for an assignment (I'm still very new to Java) and have combed through many resources to solve this conflict but still can't quite work it out. public static void main(String [] args){ Scanner keyboard = new Scanner(System.in); String input = null; do { System.out.println("Enter 'A' for option A or 'B' for option B."); String input = keyboard.next(); input.toLowerCase(); input.charAt(0); } while ((input != "a") || (input != "b")); } I always get a

问题 I'm trying to solve an assignment (I'm still very new to Java) and have combed through many resources to solve this conflict but still can't quite work it out.(NOTE: Tuna is my Scanner variable) int counted, sum, counted1; System.out.print("Enter your number to be calculated: "); counted = tuna.nextInt(); counted1 =tuna.nextInt(); for(int counted=0;counted<=counted1;counted++){ System.out.println("The sum is: "+ counted); } } } Result is: Exception in thread "main" java.lang.Error: Unresolved

问题 import java.util.*; /* * Remove duplicates from an unsorted linked list */ public class LinkedListNode { public int data; public LinkedListNode next; public LinkedListNode(int data) { this.data = data; } } public class Task { public static void deleteDups(LinkedListNode head){ Hashtable<Integer, Boolean> table=new Hashtable<Integer, Boolean>(); LinkedListNode previous=null; //nth node is not null while(head!=null){ //have duplicate if(table.containsKey(head.data)){ //skip duplicate previous

问题 Alright, I've done some searching and seem to be coming close to the answer I'm looking for. But for fear of messing something up with my current project (I'm a first time app developer and I'm quite pleased so far... I'd like to stay that way), I'm looking for a nice and clear step by step on how to copy a project. I know some things in certain places need to be imported/renamed but I'm not sure exactly what/where. So, is there a good step by step on how to do this or am I missing it? If not