I assume you want to search in your AirbnbListing list. You can use Java Stream. Use the filter method for that: List<AirbnbListing> matchingListings = listings.stream() .filter(l -> “Surrey”.equals(l.getCity())) .collect(Collectors.toList()); If you want a list of all cities, you can use the map method: List<String> matchingListings = listings.stream() .map(l -> l.getCity()) .collect(Collectors.toList()); Additionally here is an … Read more
It’s not a good practice for sure! You have two options in this case. If you would be downloading those strings every time you run a fresh app then it would be better to keep that list in a Singleton class. Or if you just want to download the first time and then probably not … Read more
Replacing byte[][] with a List<List<Byte>> makes little sense, but here is how to do it. First, though, your code is inconsistent with order of array indexes: getLive() parameters declared as x,y, but you call it with if (getLive(y, x) == 1). In getLive(), you use board[y][x], but then you use testBoard[x][y + movedistance] = 1; … Read more
The Correct Syntax for Scanner : Scanner s = new Scanner(new File(“A.txt”) ); Object In java Object is the superclass of all the classes ie. predefined sucs as String or any user defined . It will accepts any kind of data such as string or any other types contained in the A.txt file. ======================================================================== import … 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 the sample answer .When I checked your question,I saw that I need to create one person class with name,accountNo,amount,accType,Date.When we check two array List to subtract,we need to find same AccountNo in both array.So we need to use contains method and I override equal and hashCode.My Sample Person class is just like: package … Read more
List<Type> list = … list.removeIf(item -> item.getId() == something); As the name suggests, removeIf() removes all elements if they satisfy the predicate. 7 solved How to remove some items from an arraylist without loop and less time complexity?
Calling arrValue.get(i) fetches you the object of FuelData class at ith index in the arrValue arraylist. Now, if the method getOdometer() is defined inside FuelData – You should be able to access it using the below statement arrValue.get(i).getOdometer(“value1”, “value2”, “value3”) Make sure getOdometer method returns a string or atleast it returns something. Also, as I … Read more
I got the answer bu doing some simple arithmetic. Create another class to select random number for bellow cases: step1: Taking current student index step2: Randomly selecting one student, whom number should reduce, rather than step1 student continuing again step1 and step2 solved edit object/arrayList in java again and again [closed]
Let’s do a quick analysis of your code: Your Student object looks like a constructor for the Student class object type which is most likely in this case an inner class of the CollegeTester class. So here’s the deal, your addCommand() already connects your CollegeTester class with your Student class, by executing this command after … Read more
but can that iterator be converted to char array ? Yes Iterator#next() will give you string (because List has generic type String) that can be used to perform any kind of string operation. See the code below put it in main method and run. String[] str = {“Sam”, “Mohit”, “Laksh”, “Nitesh”}; List<String> list = new … Read more
indexOf expects an Object. get gets the item at the specified index previousUrl = historyArray.get(arraySizelink); 2 solved string variable to index of String array ??? JAVA
i suggest you start using Recycler view since it would be easier to do this functionality using it. here is your starting point: RecyclerView RecyclerViewAdapter Creating lists with Custom rows solved How to make a SearchView/filter on a custom ListView and add items in the underlying ArrayList using an EditText? [closed]
Your arraylist is a static variable inside your class.So there is only one arraylist in memory.Each time you call the song method , you are modifying the same list.That means your latest_songs,top_songs,hit_songs, all will be pointing to same list.That is the reason your list is getting over ridden. Try creating a list inside your method … Read more
If you are using java-8 or later then List<Drink> list = new ArrayList<>(); list.add(new Drink(“coke”, 30)); list.add(new Drink(“fanta”, 10)); list.add(new Drink(“coke”, 5)); list.add(new Drink(“sprite”, 1)); list.add(new Drink(“coke”, 10)); Map<String, Integer> map = list.stream() .collect(Collectors.groupingBy(Drink::getName, Collectors.summingInt(Drink::getAmount))); System.out.println(map); output {sprite=1, coke=45, fanta=10} Collection<Drink> c = list.stream().collect(Collectors.groupingBy(Drink::getName, Collectors.collectingAndThen( Collectors.reducing((Drink a, Drink b) -> { a.setAmount(a.getAmount() + b.getAmount()); return … Read more