arraylist

问题 I'm making a virtual pet game, and I am now trying to include hunger, however I'm not sure how to make the eat function work. I am trying to make it decrease through the addition of the nutrition value of an item of food. This value is in an object that is stored in an arraylist. Is there a way to reference int nutrition(int eaten) { nutrition = nutrition - eaten; return nutrition; (int eaten will be passed in later) inside ArrayList items; void setup() { items = new ArrayList(); } void draw(

问题 I'm finding this a bit odd, I'm parsing some JSON from a file in my /assets folder. I have set up a custom ArrayList. Now when I try and add data from the ArrayList to a listview, or a spinner (Same adapter) it only shows the last item. Here is my code: My parsing method: public ArrayList<ShopName> parseJSON(String json) { ArrayList<ShopName> shop = new ArrayList<>(); ShopName item = new ShopName(); Log.d(TAG, json); try { JSONArray jArray = new JSONArray(json); for (int i=0; i < jArray

问题 In my Java EE project I have the following Servlet: import java.io.IOException; import java.sql.Connection; import java.sql.ResultSet; import java.sql.Statement; import java.util.ArrayList; import javax.naming.InitialContext; import javax.servlet.RequestDispatcher; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.sql

问题 I am having trouble getting this thing to run. I'm not sure if what I have so far is on the right track. I'm not quite sure where is is giving me an out of bounds error. Here are the instructions: Write a method called interleave that accepts two ArrayLists of integers a1 and a2 as parameters and inserts the elements of a2 into a1 at alternating indexes. If the lists are of unequal length, the remaining elements of the longer list are left at the end of a1. For example, if a1 stores [10, 20,

问题 After consuming a json with Retrofit and using unsynchronous callback I can't pass An ArrayList from The MainActivity to a fragment . Code from MainActivity: lFragmentManager = getFragmentManager(); lFragment = lFragmentManager.findFragmentById(R.id.frame_container); lFragment = new Fragment_Categories(); Bundle bundle = new Bundle(); bundle.putParcelableArrayList("list_categories", Categories_.getCategories()); //for(int a = 0 ; a < Categories_.getCategories().size(); a++) // Log.d("billy"

问题 In my 2D grid made of JLabel as cells, I have cell's neighbors forming a "path", then draw a polygon following that path having the center of cells as Points. I use a layered pane (JPanel) to hold two panels one on top of the other to be able to draw polygons on and a GridBagLayout to allow placing two components one on top of the other. Everything works as expected. The problem is, whenever I click on an empty cell, the previous path is cleared, clearing the polygon as well. However cells

问题 What I'm looking to do is populate a ListView from an AlertDialog entry. I've tried to do this with SharedPreferences, previously I've had the last entry just saving into the ListView (if I entered more than one String), so when I left the activity and returned all that appeared in the list was my last entry. However I figured that problem out and have modified the save procedure to change the "Key" field of the stored preference by incrementing an attached Int variable. To give you the full

问题 I have an arraylist which contains some values with duplicates i want to collect those values into another Arraylist.... like Arraylist<String> one; //contains all values with duplicates one.add("1"); one.add("2"); one.add("2"); one.add("2"); Here, I want to get all the duplicates values in another arraylist... Arraylist<String> duplicates; //contains all duplicates values which is 2. I want those values which counts greater or equals 3..... Currently, I don't have any solution for this

问题 I mostly write in C but am using Java for this project. I want to know what Java is doing here under the hood. ArrayList<Integer> prevRow, currRow; currRow = new ArrayList<Integer>(); for(i =0; i < numRows; i++){ prevRow = currRow; currRow.clear(); currRow.addAll(aBunchOfItems); } Is the prevRow = currRow line copying the list or does prevRow now point to the same list as currRow? If prevRow points to the same list as currRow, I should create a new ArrayList instead of clearing.... private

问题 I have an arraylist which is providing us to string type date. I want to convert that string array into a date array; how can I do the conversion? ArrayList<String> dates = new ArrayList<String>(); where I am getting value some thing like: 2015-11-09 2015-11-08 2015-11-07 2015-11-06 2015-11-10 I want to convert this into an ArrayList of Dates and return same value in same format. 回答1: Have you read up on SimpleDateFormat? ArrayList<String> dateStringList = new ArrayList<String>(); ArrayList