add even more comparator stuff

winterbe · winterbe · commit e68ae18efd9b · 2014-03-18T22:14:10.000+01:00
diff --git a/src/com/winterbe/java8/Lambda1.java b/src/com/winterbe/java8/Lambda1.java
@@ -4,6 +4,8 @@
 import java.util.Collections;
 import java.util.Comparator;
 import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
 
 /**
  * @author Benjamin Winterberg
@@ -37,6 +39,14 @@ public int compare(String a, String b) {
         List<String> names2 = Arrays.asList("peter", null, "anna", "mike", "xenia");
         names2.sort(Comparator.nullsLast(String::compareTo));
         System.out.println(names2);
+
+        List<String> names3 = null;
+
+        Optional.ofNullable(names3).ifPresent(list -> list.sort(Comparator.naturalOrder()));
+
+        System.out.println(names3);
+
+        Objects.nonNull(names3);
     }
 
 }
