generics methods java

// generic methods public <T> List<T> fromArrayToList(T[] a) { return Arrays.stream(a).collect(Collectors.toList()); } public static <T, G> List<G> fromArrayToList(T[] a, Function<T, G> mapperFunction) { return Arrays.stream(a) .map(mapperFunction) .collect(Collectors.toList()); } // bounded generics public <T extends Number> List<T> fromArrayToList(T[] a) { ... } //multiple bounds <T extends Number & Comparable> // upper bound wildcards public static void paintAllBuildings(List<? extends Building> buildings) { ... } // lower bound wildcard <? super T>

generics in java

import java.util.Scanner;
import reader.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner scanner = new Scanner(System.in);
        String filePath = scanner.nextLine().trim();
        System.out.println("The file path is " + filePath);
        String type = filePath.substring(filePath.lastIndexOf('.') + 1).replaceAll("\\W", "");
        System.out.println("The reader type is " + type);
        AbstractReaderService reader = getReaderService(type);
        // reader.read(filePath);
        // reader.printContent();

    }

    private static AbstractReaderService getReaderService (String type) throws Exceptions.TypeNotFoundException {
        switch (type) {
            case "txt": return new TxtReaderService();
            case "json": return new JsonReaderService();
            default: throw new Exceptions().new TypeNotFoundException("There is no \"" + type + "\" type of reader.");
        }
    }
}

Posted by: Guest on August-10-2021

import java.util.Scanner; import reader.*; public class Main { public static void main(String[] args) throws Exception { Scanner scanner = new Scanner(System.in); String filePath = scanner.nextLine().trim(); System.out.println("The file path is " + filePath); String type = filePath.substring(filePath.lastIndexOf('.') + 1).replaceAll("\\W", ""); System.out.println("The reader type is " + type); AbstractReaderService reader = getReaderService(type); // reader.read(filePath); // reader.printContent(); } private static AbstractReaderService getReaderService (String type) throws Exceptions.TypeNotFoundException { switch (type) { case "txt": return new TxtReaderService(); case "json": return new JsonReaderService(); default: throw new Exceptions().new TypeNotFoundException("There is no \"" + type + "\" type of reader."); } } }

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