Well just for fun, I decided to take a shot at it. Most probably what you’ve heard was that you could corrupt the Integer’s cache in order to do this. Before getting any further, here’s the code: package test; import java.lang.reflect.Field; public class BreakMath { public static void main(String[] args) throws ClassNotFoundException, NoSuchFieldException, SecurityException, IllegalArgumentException, … Read more
Try approaching the problem as if the values you are trying to parse don’t represent a time. Instead, try to parse three separate values (hour, minute, AM/PM). How would you do that? You know that the hour is two digits and ends with a ‘:’. So extract those two characters and parse as an int. … Read more
Here is working examples with some extra Lists removed: import java.util.*; class Test { public static void main(String[] args) { List<Movie> moviesAvailable; moviesAvailable = new LinkedList<Movie>(); moviesAvailable.add(new Movie(“Matrix”,1999,new Genre(“SciFi”),3)); moviesAvailable.add(new Movie(“Jurassic Park”,1993, new Genre(“SciFi”),4)); moviesAvailable.add(new Movie(“The conjuring”,1993, new Genre(“Horror”),4)); moviesAvailable.stream().map(movie -> movie.getGenre().getName()).distinct().forEach(System.out::println); } } class Genre { private String name; public String getName() { return … Read more
You are getting null object exception because you have not initialise SQLiteDatabase before do operation Just need to replace your method public void executeEventInsert(String name, String score){ //For write data to your database SQLiteDatabase db = this.getWritableDatabase(); String query=”INSERT INTO universityFinder(univName, score) VALUES(‘”+name+”‘,'”+score+”‘);”; db.execSQL(query); } and public ArrayList<HashMap<String,String>> executeSelectEvents(int input){ String query=”select * from “+TABLE_NAME+ … Read more
Answer by @YSF_L is correct String mobiles = Arrays.stream(mmobiles.split(“,”)) .distinct() .collect(Collectors.joining(“,”)); String[] mcounts = mobiles.split(“,”); int Count = mcounts.length; solved I want unique mobile numbers and count from comma delim String variable [closed]
This is a very brief overview and you’ll probably have a bit of reading to do to be able to implement this, the steps are: Create an SQLite database to store all data in. Implement a ContentProvider which provides CRUD access to the database. Add an account authenticator and add an account (can be a … Read more
After you have gotten the user input, you can see if the input equals “#” like so: input.equals(“#”); You can get the user input using Scanner: Scanner scanner = new Scanner(System.in); String input = scanner.nextLine(); You can break from a loop by using break. The while loop would look like this: while (true) { String … Read more
Two arrays of 10^9 will use GBs of memory in any language. e.g. 2 * int[10^9] requires 8 GB of memory, whether you use C or Java. The real solution is likely to be to not create the arrays at all as they don’t appear to be needed. You can process the data as you … Read more
I was able to run the project: File->Import…->Existing Projects into Workspace Project has invalid settings – source folders are wrong. To fix that, right click on the project->Properties->Java Build Path->Source-> add src, remove src/main and src/test To run, right click on Main class->Run As->Java Application To export to jar, right click on project->Export…->Runnable JAR file … Read more
Tangental “answer” follows. (This should also print out contents to the files, unless I’m missing something very basic.) Whenever there is a set of variables in the form xN (e.g. l2, l3, l22), they should usually be replaced with a List collection type such as an ArrayList. This is just an example to show how … Read more
There are a lot of answers to this question in stackoverflow. Next time search before you ask! Here is a simple code which gives what you want: String str= “animal 1 animal”; Pattern p = Pattern.compile(“-?\\d+”); Matcher match = p.matcher(str); while (match.find()) { System.out.println(match.group()); } It is the same with your other Strings.. just change … Read more
Poorly phrased question, but if the values you have as keys (A1, A2, etc…) are String and you want to check by the first letter of the key, you can try something like this: int count = 0; for (String k : myMap.keySet()){ if(k.startsWith(“A”)){ count++; } } 4 solved How to count the number of … Read more
The following method should resolve your problem public boolean isInRange() { Calendar calendar = Calendar.getInstance(); int minute = calendar.get(Calendar.MINUTE); return minute >= 10 && minute < 15; } It simple recoveries the minute from the current time and verifies if it is between 10 and 15 0 solved Using Java, how can i see if … Read more
You should declare your variables correctly int z,a,b,c,d,e,f,g; and calculate the max score only after you read in all the values. 1 solved Java compile error: symbol cannot be found [closed]
We use extends when we want to create a subclass of some class, and this is not android-specific, but part of Java. You might want to follow this tutorial. solved When do we use ‘extends’ in a class in android [closed]