Search file from array by part of its name

Question

There is a MapMap, it transfers data to an array. In the array, the data is sorted, everything is fine. It is necessary to make such a method to take only 5 pieces from the array after sorting, which begin with the given letters.

For example, I entered abc and he returned to you a list of 5 values that start with abc.

The main thing is that exactly 5 values and the order of the files should not be lost (they are already sorted by date \ alphabet)

public static void main(String[] args) { TreeMap<File, Class> classesByFiles = find("com.company", ""); // получил мапу List<File> files = new ArrayList<>(classesByFiles.keySet()); //получил список файлов из мапы Collections.sort(files, MODIFIED_DATE_FILE_COMPARATOR);// посортировал for (File file : files) // идем по массиву { System.out.println(file);// выводим его на печать для проверки }

And why create an array in the TreeMap keys are also sorted.
@pavel In the 'Treemap' they are sorted alphabetically, and we need first of all by the date of the last change.
The essence of the question is to get from the already sorted array only 5 values starting with the entered characters.

carapuz 1,568 2 22 51 · Accepted Answer · 2016-05-03T20:20:52

Something like that

 List<File> abc = files.stream().filter(f -> f.getName().startsWith("abc")) .limit(5).collect(Collectors.toList());

Or so

 { public static void main(String[] args) throws InvalidArgumentException { List<File> files = new ArrayList<>(); files.add(new File("C:/test/")); files.add(new File("abc1")); files.add(new File("abc2")); files.add(new File("abc3")); files.add(new File("weabc4")); files.add(new File("abc5")); files.add(new File("sdabc5")); files.add(new File("abc4")); Collections.sort(files); String startName = "abc"; List<File> files1 = getFiles(files, startName); files1.forEach(f -> System.out.println(f.getName())); } public static List<File> getFiles(List<File> files, String startName){ List<File> listFiles = new ArrayList<>(); for (File file : files) { if(file.getName().startsWith(startName)) listFiles.add(file); } if(listFiles.size() > 5) return listFiles.subList(0, 5); return listFiles; } }

these are the settings of your IDE, ALT + Enter and show you the mole to add to the exception and import Collectors

Search file from array by part of its name

1 answer 1

More articles: