collections

问题 I have this class: public class Friend { private String name; private String location; private String temp; private String humidity; public String getTemp() { return temp; } public void setTemp(String temp) { this.temp = temp; } public String getHumidity() { return humidity; } public void setHumidity(String humidity) { this.humidity = humidity; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getLocation() { return location; }

问题 Obviously, sets do not have any kind of ordering, so I cannot expect any specific ordering if I do String[] string = mySet.toArray(); However, I am faced with a use case where I don't care what ordering the string array is in, but I DO need it to be the case that if two sets are equal to each other, then: StringUtils.join(mySet.toArray(),','); will produce the same exact string for those sets, always, no matter how many times I run the program assuming I stick with the same code. Do I have

问题 I have a multi-dimensional array of string . I am willing to convert it into some collection type, so that I can add, remove and insert elements according my wish. In array I can not remove element at particular position. I need such collection in which I can remove data at particular position, also able to add data at any position. Also dont forget I have multi-dimension array, so the collection should also able to store multidimensional data. Which collection will be suitable for my

问题 I have an array as follows: int[] array = {11, 14, 17, 11, 48, 33, 29, 11, 17, 22, 11, 48, 18}; What I wanted to do was to find the duplicate values, and print them. So my way of doing this was to convert to ArrayList , then to Set and use a stream on the Set . ArrayList<Integer> list = new ArrayList<>(array.length); for (int i = 0; i < array.length; i++) { list.add(array[i]); } Set<Integer> dup = new HashSet<>(list); I then used a stream to loop through it and print the values using

问题 I have an array as follows: int[] array = {11, 14, 17, 11, 48, 33, 29, 11, 17, 22, 11, 48, 18}; What I wanted to do was to find the duplicate values, and print them. So my way of doing this was to convert to ArrayList , then to Set and use a stream on the Set . ArrayList<Integer> list = new ArrayList<>(array.length); for (int i = 0; i < array.length; i++) { list.add(array[i]); } Set<Integer> dup = new HashSet<>(list); I then used a stream to loop through it and print the values using

问题 program: public class SortedSet1 { public static void main(String[] args) { List ac= new ArrayList(); c.add(ac); ac.add(0,"hai"); ac.add(1,"hw"); ac.add(2,"ai"); ac.add(3,"hi"); ac.add("hai"); Collections.sort(ac); Iterator it=ac.iterator(); k=0; while(it.hasNext()) { System.out.println(""+ac.get(k)); k++; } } } output: ai hai hi hw hai how it execute 5 times?? while come to hai no next element present so condition false. But how it executed. 回答1: Your loop above iterates through the list

问题 Am new in Nodejs , Am trying to create user login system with mongoDB and passportjs . Here i want to change collection name. i refer this video here This is my code: Database connection js config/database.js module.exports = { database : 'mongodb://localhost:27017/my_first_project', secret : 'Mysecret' } models/admin.js const mongoose = require('mongoose'); let AdminSchema = mongoose.Schema({ name:{ type: String, required: true }, email:{ type: String, required: true }, username:{ type:

问题 I am iterating through a DataTable using SqlDataAdapter and storing it in a list. Here is my code. public IEnumerable<DataRow> GetRecord() { var table = new DataTable(); using (var da = new SqlDataAdapter("SELECT * FROM mv_tbl", "ConnectionString")) { da.Fill(table); List<DataRow> list = new List<DataRow>(); foreach (DataRow r in table.Rows) { list.Add(r); } return list; } } This gives me a result which has unnecessary data also. Here is the result. [{"RowError":"", "RowState":2, "Table":[{

问题 This question already has answers here : Closed 9 years ago . Possible Duplicate: Container Class / Library for C We have to maintain and even develop C-code of our legacy system. Is there good collection library that would support Java/C# (new versions) style collections. Hashtable, HashSet, etc. Of course without objects, but with structs. The HashTable key limitations to "strings" and ints is not a problem. It wouldn't be bad if it's free even for commercial use. I'm back to C from C# and

问题 private int checkLevel(String bigWord, Collection<String> dict, MinMax minMax) { /*value initialised to losing*/ int value = 0; if (minMax == MinMax.MIN) value = 1; else value = -1; boolean go = true; Iterator<String> iter = dict.iterator(); while(iter.hasNext()) { String str = iter.next(); Collection<Integer> inds = naiveStringSearch(bigWord, str); if(inds.isEmpty()) { iter.remove(); } for (Integer i : inds) { MinMax passin = minMax.MIN; if (minMax == MinMax.MIN) passin = minMax.MAX; int