ejemplos con la clase optional mostrados en clase

Author: sierisimo

modules/src/main/java/com/platzi/functional/_12_optionals/Optionals.java

@@ -0,0 +1,60 @@
+package com.platzi.functional._12_optionals;
+
+import java.util.Collections;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Optional;
+
+public class Optionals {
+    public static void main(String[] args) {
+        List<String> names = getNames();
+        if (names != null) {
+            //Operar con nombres.
+        }
+
+        Optional<List<String>> optionalNames = getOptionalNames();
+        if (optionalNames.isPresent()) {
+
+        }
+
+        optionalNames.ifPresent(namesValue -> namesValue.forEach(System.out::println));
+
+        Optional<String> valuablePlayer = optionalValuablePlayer();
+
+        String valuablePlayerName = valuablePlayer.orElseGet(() -> "No player");
+    }
+
+    static List<String> getNames() {
+        List<String> list = new LinkedList<>();
+
+        return Collections.emptyList();
+    }
+
+    static String mostValuablePlayer() {
+//        return "";
+        return null;
+    }
+
+    static int mostExpensiveItem(){
+        return -1;
+    }
+
+    static Optional<List<String>> getOptionalNames(){
+        List<String> namesList = new LinkedList<>();
+        //Obtencion de nombres
+        return Optional.of(namesList);
+    }
+
+    static Optional<String> optionalValuablePlayer(){
+        //
+//        return Optional.ofNullable()
+          try {
+              //Accesos
+              return Optional.of("Sinuhe");
+          }catch (Exception e){
+              e.printStackTrace();
+          }
+
+          return Optional.empty();
+    }
+}