try this, public void updateQty(Integer qty,String bookId) { int originalQty = getQuantity(bookId); int updateQty = originalQty – qty; try{ SQLiteDatabase db = this.getWritableDatabase(); String rawQuery = “update ” + BOOKS_TABLE + ” set ” + KEY_QTY + ” = ” + updateQty + ” where ” + KEY_BOOK_ID + ” = ‘” + bookId + … Read more
This should work. if you are not using an IDE, then maybe you changed your code and didn’t compile again. so you are essentially running an old code with different output? 2 solved Java Input from console giving unexpected values [closed]
String s = “[{\”index\”:1,\”questions\”:\”If the number of berths in a train are 900 more than one-fifth of it, find the total berths in the train?\”,\”options\”:[\”1145\”,\”1130\”,\”1135\”,\”1125\”,\”1120\”],\”answers\”:\”1125\”,\”useranswers\”:\”1145\”}]”; try { JSONArray a; a = new JSONArray(s); JSONObject o = (JSONObject) a.get(0); JSONArray options = o.getJSONArray(“options”); } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } 2 … Read more
You have to: read first line split it to get dimensions read next lines (regards dimensions) read special char (@) repeat Reading first array you have there: static void readFile() throws IOException { BufferedReader reader; reader = new BufferedReader(new FileReader(“file.txt”)); String firstDimension = reader.readLine(); String[] split = firstDimension.split(” “); int firstX = Integer.parseInt(split[0]); int firstY … Read more
Take a look at this. I have tried grids 10×10 – solved in cca 3-4ms (including input), which is far below 2s. class Escape_Room { static boolean method(Map<Integer, Set<Integer>> transitionMap, int size, int start) { Set<Integer> closed = new HashSet<Integer>(size); Queue<Integer> q = new LinkedList<>(); q.add(start); int key; while(!q.isEmpty()) { key = q.poll(); if(closed.contains(key)) { … Read more
There is no any class inside another class, This source code has two class seperately. We can write many classes inside a single source code. easy of transport could be the reason. Note that when you write multiple classes in the same source code, you can only define one public class and its name should … Read more
There is nothing adding in the array and the c value is still zero. You might confused with the line for (int d : b) { That is java for each loop. 0 solved What does this method return?
These two loops are not the same: The first loop will never stop The second loop will run for a long time, until i overflows, at which point the loop will exit. Given that these two loops are not the same, the byte code, CPU usage, and speed for each would be different as well. … Read more
You can do it like this to iterate the whole array column-wise: // Get the maximum number of columns among all rows. int maximumColumns = 0; for (double[] row : multi) { if (row.length > maximumColumns) { maximumColumns = row.length; } } for (int column = 0; column < maximumColumns ; column++) { for (int … Read more
Perhaps you meant int x = Integer.parseInt(“12312a”, 16); 0 solved Number format exception in parse int
This: input.replaceAll(” “, “”).toCharArray() Probably better to use length() to count the chars though… 7 solved How to convert String to char array without spaces in Java?
No, there’s nothing built-in that does what you describe. You’d do it with a temporary variable: boolean flag = true; boolean returnValue = flag; flag = false; return returnValue; Or based on your further edit to the question (“The structure looks something like this”), you can use !: boolean flag = false; // some operations … Read more
Google surely uses it 🙂 Here is a listing, from 2008 though. And another listing from google (we also used GWT for a client side component in a project) solved who are using gwt? [closed]
public static void printStartEndQuarter(int year, int month) { double thisMonth = (double)month; String quarter = thisMonth/3 <= 1 ? “Quarter 1” : thisMonth/3 <= 2 ? “Quarter 2” : thisMonth/3 <= 3 ? “Quarter 3” : “Quarter 4”; if (month % 3 == 2) { month = month – 1; } else if (month % … Read more
item.getComponentAt(p); What is the point of that statement? How can you tell if the code worked or not since you never assign the result of the method to a variable? Turns out that because the panel is not really a component displayed on the frame you can’t just do as I originally suggested. If you … Read more