#17 java

Author: martinbohorquez

Roadmap/17 - ITERACIONES/java/martinbohorquez.java

@@ -0,0 +1,77 @@
+import java.util.*;
+
+/**
+ * #17 ITERACIONES
+ *
+ * @author martinbohorquez
+ */
+public class martinbohorquez {
+    public static void main(String[] args) {
+        // 1. for
+        System.out.println("1. Iteración usando 'for':");
+        for (int i = 1; i <= 10; i++) System.out.println(i);
+
+        // 2. while
+        System.out.println("2. Iteración usando 'while':");
+        int i = 1;
+        while (i <= 10) System.out.println(i++);
+
+        // 3. recursividad
+        System.out.println("3. Iteración usando 'función recursiva':");
+        count10(1);
+
+        /*
+         * DIFICULTAD EXTRA
+         */
+        //4. Array y for
+        System.out.println("4. Iteración usando 'array con fori'");
+        int[] numbers = {6, 5, 4, 3, 2, 1};
+        for (int number : numbers) System.out.println(number);
+
+        //5. Stream y forEach
+        System.out.println("5. Iteración usando 'stream con forEach'");
+        Arrays.stream(numbers).forEach(System.out::println);
+
+        // 6. Lista, reversed y forEach
+        System.out.println("6. Iteración usando 'lista con forEach(reversed)'");
+        Arrays.asList(1, 2, 3, 4).reversed().forEach(System.out::println);
+
+        //7 String, split, stream y forEach
+        System.out.println("7. Iteración para una 'string' (sorted) usando 'split, stream y forEach'");
+        String word = "strawberry";
+        Arrays.stream(word.split("")).sorted().forEach(System.out::println);
+
+        // 8. Map, keySet, values, forEach
+        System.out.println("8. Iteración para una 'map' por keys/values usando 'forEach'");
+        Map<Integer, String> map = new HashMap<>();
+        map.put(1, "a");
+        map.put(2, "b");
+        map.put(3, "c");
+        map.put(4, "d");
+        map.put(5, "e");
+        map.keySet().forEach(System.out::println);
+        map.values().forEach(System.out::println);
+        map.forEach((key, value) -> System.out.println(key + ": " + value));
+
+        // 9. do-while
+        System.out.println("9. Iteración usando 'do-while':");
+        i = 10;
+        do {
+            System.out.println(i--);
+        } while (i >= 1);
+
+        // 10. set, iterator
+        System.out.println("10. Iteración de un 'set' usando 'iterator':");
+        Set<String> set = new HashSet<>(Arrays.asList("a", "b", "c", "d", "e"));
+        Iterator<String> iterator = set.iterator();
+        iterator.forEachRemaining(System.out::println);
+
+    }
+
+    private static void count10(int i) {
+        if (i <= 10) {
+            System.out.println(i);
+            count10(++i);
+        }
+    }
+}