hashmap

问题 i have a question about HSET in redis. As far as i know, redis is a key-value database. that means every thing store as a key-value and we don't have table for example. i wanted to save something in redis so i decided to use Hashmap . since the HMSET is deprecated and we should use HSET instead, how should I store many attribute as a value and a id as a key in hset? you know i want to save some thing like this: await redis.hset(`origin-${originId}`, 'title',title) but if i have many fields to

问题 Like many new Rustaceans, I've been working my way through the Rust Book. I'm reading through the chapter on collections, and I'm stuck on one of the exercises. It reads: Using a hash map and vectors, create a text interface to allow a user to add employee names to a department in a company. For example, “Add Sally to Engineering” or “Add Amir to Sales.” Then let the user retrieve a list of all people in a department or all people in the company by department, sorted alphabetically. Here is

问题 I am working on a project that gets queries from a database on a remote server. The SQL side of it gets information from two separate tables, combines them and sends a JSON encoded string back me. I then parse the string and create an ArrayList with a HashMap of String, String to hold the data. All of this works just fine. There are 108 entries and all the related variables show this. My problem arises when I try and put the final ArrayList HashMap into a listView. I have created a custom

问题 I'm having a validate method that return a boolean . I'm using invoking this method (Java 7) as follow: boolean isValid = true; for (String key: aMap.keySet()) { isValid &= validate(key, aMap.get(key)); } I would like to rewrite this code in Java 8. Java 8 allows iterating across a Map using: aMap.forEach((k,v) -> validate(k, v)); But this won't work: aMap.forEach((k,v) -> isValid &= validate(k, v)); Question How can I rewrite the the Java 7 code into Java 8 to achieve the same result? Note:

问题 I currently have an expandable list view that is populating just fine. However when the child view is filling it creates individuals views and rows for each entry. I would like to have one view and multiple textviews in the view as well as a button that I will be adding. The data is being populated from a HASHMAP. I have tried many things and cannot get multiple textviews to populate correctly in the listview. All data comes from this hashmap: private HashMap<String, List<String>>

问题 After storing the words found on a web page and mapping them with their number of occurrences, how would you sort them by frequency(highest to lowest)? The only imports I have access to are Arrays, HashMap, HashSet, Map, and Set. I did research on how to do this but it seems like most people suggested using comparators or iterators, which I don't want to implement. The map is set up as follows: Map found = new HashMap<>(); Here's what I have so far: import java.util.Arrays; import java.util

问题 I am trying to sort a HashMap first by value (integer) then by key (string). The following method doesn't appear to be sorting the hashmap properly. Any ideas how to make it work properly ? private static Map<String, Integer> sortHash(Map<String, Integer> map) { List<Map.Entry<String, Integer>> list = new ArrayList<>(map.entrySet()); // Sort list by integer values then by string keys Collections.sort(list, (a, b) -> { int cmp1 = a.getValue().compareTo(b.getValue()); if (cmp1 != 0) return cmp1

问题 i am getting only last row coloured.. class CustomTableCellRenderer extends DefaultTableCellRenderer { private Map<Integer, Color> mapColors; public CustomTableCellRenderer() { mapColors = new HashMap<>(); } public void setRowColor(int row, Color color) { // System.out.println(row + "...happy...." + color); mapColors.put(row, color); } @Override public Component getTableCellRendererComponent(JTable table, Object obj, boolean isSelected, boolean hasFocus, int row, int column) { Component cell

问题 This is what I want: As you can see in the image I have stored sub-Lists on each main List position. Now I want to display one item from sub-list when main loop is working. If looping counter is greater than sub-List size then it starts again from 0 and increments one by one. What I have done: I have got the data from database and stored sub-Lists in a ArrayList public static ArrayList<ArrayList<HashMap<String, String>>> selectdataloop(SQLiteDatabase db, String TableName,String userfield

问题 I am using Map<Integer, String> adi = new HashMap<Integer, String>(); for(int u=0; u< sari_nodes.size();u++){ adi.put(u, sari_nodes.get(u)); } for (Map.Entry<Integer, String> entry : adi.entrySet()) { tv.setText(tv.getText()+"Key : " + entry.getKey()+ " Value : " + entry.getValue()+"\n"); } My output is : key: 0 Value : cat key: 1 Value : dog key: 2 Value : car key: 3 Value : car key: 4 Value : car key: 5 Value : car I want to repeat the key for same entry so that my output looks like key: 0