ArrayMap keeps its mappings in an array data structure — an integer array of hash codes for each item, and an Object array of the key -> value pairs. Where ArrayList is a List. Resizable-array implementation of the List interface. Implements all optional list operations, and permits all elements, including null. FYI ArrayMap is a … Read more
The error message tells you exactly what’s wrong. There is no declared variable by the name of array. public class ArrayObjects<E> implements SomeImp<E> { int maxCapacity, actualSize; E[] array; // <- The missing declaration @SuppressWarnings(“unchecked”) // <- Suppress the “unchecked cast” warning public ArrayObjects() { maxCapacity = 10; array = (E[]) new Object[maxCapacity]; } } … Read more
For cryin’ out loud — it’s a simple conversion. No fancy functions required. int[] digits = {1, 5, 3, 6, 3}; int totalNumber = 0; for (int i = 0; i < digits.length; i++) { totalNumber = (totalNumber * 10) + digits[i]; } System.out.println(totalNumber); 2 solved Converting an array of single digits to an integer … Read more
“And” is missing between estate.BHK=? address.cityID=? 0 solved You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘ ‘ at line 1
Scanner sc = new Scanner(System.in); int i = sc.nextInt(); // for integer value byte by = sc.nextByte(); // for Byte value String s = sc.nextLine(); // for String value You can find other method of Scanner class .Scanner class Method solved How to use java.util.scanner in android and java? [closed]
startActivity() is a method on Context, so you can call it on any object that is of a class that inherits from Context. Frequently, we call startActivity() on an existing Activity. For example, here we have an Activity that calls startActivity() on itself to start up another activity: /*** Copyright (c) 2012 CommonsWare, LLC Licensed … Read more
If I am not mistaken, the strings all begin with G1:k6YxekrAP71LqRv. After that, there is [P:3] by itself, or with either left S:2,3,4|, right |R:2,3,4,5 or with both left and right. The values 2,3,4 and 2,3,4,5 could be repetitive digits divided by a comma. To match the full pattern you could use: (G1:k6YxekrAP71LqRv)\[(?:S:(?:\d,)+\d\|)?(P:3)(?:\|R:(?:\d,)+\d)?\] Explanation (G1:k6YxekrAP71LqRv) … Read more
What if x is something besides 0-9? You don’t have a return statement for that case. Add it at the bottom, below your last else if: return “Other”; 1 solved Missing return statement } in java error [duplicate]
The problem could be solved using recursion. For example, the code below prints exactly the required matrix for a given n. import java.util.Scanner; public class Main { public static void main(final String[] args) { final Scanner scanner = new Scanner(System.in); final int n = scanner.nextInt(); final int[][] matrix = create(1, (int) Math.pow(2, n)); print(matrix); } … Read more
You have a couple of options, but the generally best approach here is to create getters: public class PersonalId { // ——————- renamed: it was “personal_id” private int id = 0; // ——————- fixed: was “privete” instead of “private” private String name; public PersonalId(String name) { // ——————- renamed: it was “personal_id” this.name = name; … Read more
You’d better simplify all of this, you don’t need to call your method multiple times : public static void main(String[] args) { Scanner scanner = new Scanner(System.in); while (writeAndCheckEven(Integer.parseInt(scanner.nextLine()))) { System.out.println(“You added an even number, go on”); } System.out.println(“You added an odd number, done!”); } private static boolean writeAndCheckEven(int number) { return number % 2 … Read more
From https://docs.oracle.com/javase/7/docs/api/java/util/ConcurrentModificationException.html For example, it is not generally permissible for one thread to modify a Collection while another thread is iterating over it. In general, the results of the iteration are undefined under these circumstances. Some Iterator implementations (including those of all the general purpose collection implementations provided by the JRE) may choose to throw … Read more
This is HTTP. You can’t just open a socket and start reading something. You have to be polite to the server and send a request first: socket.getOutputStream().write(“GET /index.html HTTP/1.0\n\n”.getBytes()); socket.getOutputStream().flush(); Then read a HTTP response, parse it, and get your html page back. EDIT I wrote what to do with sockets only because it was … Read more
Your question is unclear but if you just want an example of JSONObject then the code below can generate what you want. JSONObject car = new JSONObject(); car.put(“car”, new JSONObject()); JSONArray brands = new JSONArray(); brands.put(“C”); brands.put(“D”); car.put(“brands”, brands); JSONArray cars = new JSONArray(); cars.put(car); JSONObject json = new JSONObject(); json.put(“cars”, cars); System.out.println(json.toString(2)); The output … Read more
The function for onClick attribute in XML has to be something like, public void yourFunction (View view) { //Your code } Since you didn’t add View as the argument of your function, your layout is never going to get to it, hence when you click on your button, the app crashes. You also need to … Read more