[LANG-1561] use List.sort instead of Collection.sort (#546)

* use_List_sort

* Update MethodUtils.java

* Update ObjectToStringComparatorTest.java

1 files changed, 3 insertions, 4 deletions

diff --git a/src/test/java/org/apache/commons/lang3/compare/ObjectToStringComparatorTest.java b/src/test/java/org/apache/commons/lang3/compare/ObjectToStringComparatorTest.java
index c233cf1c2..489c3101d 100644
--- a/src/test/java/org/apache/commons/lang3/compare/ObjectToStringComparatorTest.java
+++ b/src/test/java/org/apache/commons/lang3/compare/ObjectToStringComparatorTest.java
@@ -20,7 +20,6 @@ package org.apache.commons.lang3.compare;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
 import java.util.Arrays;
-import java.util.Collections;
 import java.util.List;
 
 import org.junit.jupiter.api.Test;
@@ -47,7 +46,7 @@ public class ObjectToStringComparatorTest {
     @Test
     public void testNull() {
         final List<Thing> things = Arrays.asList(null, new Thing("y"), null);
-        Collections.sort(things, ObjectToStringComparator.INSTANCE);
+        things.sort(ObjectToStringComparator.INSTANCE);
         assertEquals("y", things.get(0).string);
         assertEquals(null, things.get(1));
         assertEquals(null, things.get(2));
@@ -56,7 +55,7 @@ public class ObjectToStringComparatorTest {
     @Test
     public void testNullToString() {
         final List<Thing> things = Arrays.asList(new Thing(null), new Thing("y"), new Thing(null));
-        Collections.sort(things, ObjectToStringComparator.INSTANCE);
+        things.sort(ObjectToStringComparator.INSTANCE);
         assertEquals("y", things.get(0).string);
         assertEquals(null, things.get(1).string);
         assertEquals(null, things.get(2).string);
@@ -65,7 +64,7 @@ public class ObjectToStringComparatorTest {
     @Test
     public void testSortCollection() {
         final List<Thing> things = Arrays.asList(new Thing("z"), new Thing("y"), new Thing("x"));
-        Collections.sort(things, ObjectToStringComparator.INSTANCE);
+        things.sort(ObjectToStringComparator.INSTANCE);
         assertEquals("x", things.get(0).string);
         assertEquals("y", things.get(1).string);
         assertEquals("z", things.get(2).string);