hashmap

问题 Do I have to override hashCode() method, if I'm going to customize HashMap ? UPD: For example: import java.util.HashMap; import java.util.Objects; /** * * @author dolgopolov.a */ public class SaltEntry { private long time; private String salt; /** * @return the time */ public long getTime() { return time; } /** * @param time the time to set */ public void setTime(long time) { this.time = time; } /** * @return the salt */ public String getSalt() { return salt; } /** * @param salt the salt to

问题 I am a bit lost. i have a csv file like the following USN Name DOB Sem Percentage 111 abc 07/03 3 88 112 cde 18/07 4 77 123 ghi 15/11 4 80 I want to create a dictionary kind of structure (multilevel dictionary- Dictionary <string, Dictionary<string, string>> ) using C++. Here i want to store the 1st line as key i.e USN, Name, DOB ... as keys of the hash and the values in that columns as values of the hash. Is it possible? Any help will be greatly appreciated .. Thanks in advance. 回答1: Given

问题 Goal is to take in a String[] length 36 and it will be a 6x6 array from 1x1 to 6x6 then print out the coordinates of a word found in the 2d array. Easy enough. I have placed each array item into the map with the corresponding coordinates (as a String value because I need to return a String). If I print all the values they print correctly 11 through 66, but if the input is "NO70JE3A4Z28X1GBQKFYLPDVWCSHUTM65R9I" for example I get "1271" as an output when I should be getting "1166". Any ideas?

问题 As input I have a hashmap which stores as a key an int array of the form [0,1,0,0,0,1,1,0,0,6,0,1] and as a key a String label, i.e. science . What I want to do is extract the array and deposit it into a 2D array. The I want to compare the label to another string and if it is a match save a 1 to outputs else save a zero. I thought the code below would do that trick, but it seems not. Where have I gone wrong? double[][] feature_matrix = new double[ number_of_files ][ globo_dict_size ]; int[]

问题 Is it possible for me to have multiple keys and multiple values for my .ini file? if so how? i know we can have single key with multiple values using list or multimaps but can i replicate the same concept for multiple keys like this-keys-a,b,c values-(for row 1)d,e,f and so on for multiple rows what i actually want is this for my ini file key1||key2||key3 value1||value2||value3 value4||value5||value6 key1 maps to value1 and4 and so on and all of this should be in one map 回答1: Re your edit, it

问题 How do i remove the key value pair in the code below comparing with elements in HashMap? Map<BigDecimal, TransactionLogDTO> transactionLogMap = new HashMap<BigDecimal, TransactionLogDTO>(); for (BigDecimal regionID : regionIdList) {// Generation new logDTO // objects for each in scope // region transactionLogMap.put(regionID, new TransactionLogDTO()); } Set<BigDecimal> inScopeActiveRegionIdSet = new HashSet<BigDecimal>(); for (PersonDTO personDTO4 : activePersons) { inScopeActiveRegionIdSet

问题 I am having Map<String, List<Attribute>> binList = new HashMap<String, List<Attribute>>(); I want to iterate through each values in list By doing this I am able to get the key and its entire values.But how to get each single value for a key. BinList {3=[index=0 {from=1.3,to=2.42}, index=1 {from=2.42,to=3.54}, index=2 {from=3.54,to=4.66}, index=3 {from=4.66,to=5.78}, index=4 {from=5.78,to=6.9}], 2=[index=0 {from=2.3,to=2.76}, index=1 {from=2.76,to=3.2199999999999998}, index=2 {from=3

问题 I would like to process a text file (about 400 MB) in order to create a recursive parent-child-structure from the data given in each line. The data have to be prepared for a top down navigation (input: parent, output: all children and sub children). E.g. of lines to be read: ( child ,id1,id2, parent ,id3) 132142086 ;1;2; 132528589 ;132528599 132142087 ;1;3; 132528589 ;132528599 132142088 ;1;0; 132528589 ;132528599 323442444 ;1;0; 132142088 ;132528599 454345434 ;1;0; 323442444 ;132528599

问题 I made an EmployeeStore to obviously store employee details such as name,id and email. I set up a menu and now whenever the user wants to add an employee i get stuck on what to do. Here is my code: MenuMethods: //Imports import java.util.Scanner; //******************************************************************** public class MenuMethods { private static Scanner keyboard = new Scanner(System.in); //Methods for the Company Application menu. //Method for validating the choice. public static

问题 I am creating an android application and my code will loop through the json data and if finds a match to the string that i have placed in ( in this case "Guil Hernandez") , then it will add that name to an array list of hashmaps. I then populate my listview with a simple adapter. Everything is working properly, but my listview will not appear. Am i doing this sorting "algorithm" wrong? Also if you know of a better way to do the sorting to find a match..PLEASE LET ME KNOW. i am still new to