From de057dc286243b075193730b3adfa2e5c33a9eb8 Mon Sep 17 00:00:00 2001
From: joe zhang <joe.zhang@ringcentral.com>
Date: Tue, 7 Jul 2020 13:20:06 +0800
Subject: [PATCH] update labmda function

---
 .../convertlisttomap/ListToMapUnitTest.java   | 28 +++++--------------
 1 file changed, 7 insertions(+), 21 deletions(-)

diff --git a/java-collections-conversions-2/src/test/java/com/baeldung/convertlisttomap/ListToMapUnitTest.java b/java-collections-conversions-2/src/test/java/com/baeldung/convertlisttomap/ListToMapUnitTest.java
index 5a875a904e..4ca5671e29 100644
--- a/java-collections-conversions-2/src/test/java/com/baeldung/convertlisttomap/ListToMapUnitTest.java
+++ b/java-collections-conversions-2/src/test/java/com/baeldung/convertlisttomap/ListToMapUnitTest.java
@@ -24,13 +24,9 @@ public class ListToMapUnitTest {
 
         Map<Integer, List<String>> convertedMap = new HashMap<>();
 
-        Supplier<List<String>> listSupplier = () -> {
-            return new ArrayList<>();
-        };
+        Supplier<List<String>> listSupplier = ArrayList::new;
 
-        Supplier<Map<Integer, List<String>>> mapFactory = () -> {
-            return new HashMap<>();
-        };
+        Supplier<Map<Integer, List<String>>> mapFactory = HashMap::new;
         convertedMap = strings.stream()
             .collect(Collectors.groupingBy(String::length, mapFactory, Collectors.toCollection(listSupplier)));
 
@@ -45,13 +41,9 @@ public class ListToMapUnitTest {
 
         Map<Integer, List<String>> convertedMap = new HashMap<>();
 
-        Supplier<Map<Integer, List<String>>> mapFactory = () -> {
-            return new HashMap<>();
-        };
+        Supplier<Map<Integer, List<String>>> mapFactory = HashMap::new;
 
-        Supplier<List<String>> listSupplier = () -> {
-            return new ArrayList<>();
-        };
+        Supplier<List<String>> listSupplier = ArrayList::new;
 
         BiConsumer<Map<Integer, List<String>>, String> accumulator = (response, element) -> {
             Integer key = element.length();
@@ -78,17 +70,11 @@ public class ListToMapUnitTest {
 
         Map<Integer, List<String>> convertedMap = new HashMap<>();
 
-        Supplier<Map<Integer, List<String>>> mapFactory = () -> {
-            return new HashMap<>();
-        };
+        Supplier<Map<Integer, List<String>>> mapFactory = HashMap::new;
 
-        Supplier<List<String>> listSupplier = () -> {
-            return new ArrayList<>();
-        };
+        Supplier<List<String>> listSupplier = ArrayList::new;
 
-        Function<String, Integer> keyMapper = (element) -> {
-            return element.length();
-        };
+        Function<String, Integer> keyMapper = String::length;
 
         Function<String, List<String>> valueMapper = (element) -> {
             List<String> collection = listSupplier.get();