Add examples with replacing lambdas to method references

aplotnikov · aplotnikov · commit 3bb34d84b365 · 2018-12-26T20:52:04.000+01:00
diff --git a/src/main/java/io/github/aplotnikov/java_8_misuses/lambda/LambdasAreNotAlwaysTheBestOption.java b/src/main/java/io/github/aplotnikov/java_8_misuses/lambda/LambdasAreNotAlwaysTheBestOption.java
@@ -0,0 +1,37 @@
+package io.github.aplotnikov.java_8_misuses.lambda;
+
+import java.util.Optional;
+
+import static io.github.aplotnikov.java_8_misuses.utils.Annotations.Good;
+import static io.github.aplotnikov.java_8_misuses.utils.Annotations.Ugly;
+
+class LambdasAreNotAlwaysTheBestOption {
+
+    @Ugly
+    class UnneededLambdasUsage {
+        void processAndPrint(String name) {
+            Optional.ofNullable(name)
+                    .map(s -> s.toUpperCase())
+                    .map(s -> doProcess(s))
+                    .ifPresent(s -> System.out.print(s));
+        }
+
+        private String doProcess(String name) {
+            return "MR. " + name;
+        }
+    }
+
+    @Good
+    class MethodReferenceUsage {
+        void processAndPrint(String name) {
+            Optional.ofNullable(name)
+                    .map(String::toUpperCase)
+                    .map(this::doProcess)
+                    .ifPresent(System.out::print);
+        }
+
+        private String doProcess(String name) {
+            return "MR. " + name;
+        }
+    }
+}
