Replace Lambda with method reference.

src/main/org/apache/tools/ant/property/LocalPropertyStack.java

@@ -17,6 +17,7 @@
  */
 package org.apache.tools.ant.property;
 
+import java.util.AbstractCollection;
 import java.util.Collections;
 import java.util.Deque;
 import java.util.HashSet;
@@ -159,8 +160,8 @@ public class LocalPropertyStack {
      */
     public Set<String> getPropertyNames() {
         final Set<String> names = stack.stream().map(Map::keySet)
-            .collect(Collector.of(() -> new HashSet<String>(),
-                (ns, ks) -> ns.addAll(ks),
+            .collect(Collector.of(HashSet::new,
+                    AbstractCollection::addAll,
                 (ns1, ns2) -> { ns1.addAll(ns2); return ns1; },
                 Collector.Characteristics.UNORDERED, Collector.Characteristics.IDENTITY_FINISH));
         return Collections.unmodifiableSet(names);

src/main/org/apache/tools/ant/taskdefs/optional/junitlauncher/LauncherSupport.java

@@ -653,9 +653,8 @@ public class LauncherSupport {
         @Override
         public void executionStarted(final TestIdentifier testIdentifier) {
             super.executionStarted(testIdentifier);
-            AbstractJUnitResultFormatter.isTestClass(testIdentifier).ifPresent(testClass -> {
-                this.originalSysOut.println("Running " + testClass.getClassName());
-            });
+            AbstractJUnitResultFormatter.isTestClass(testIdentifier).ifPresent(testClass ->
+                    this.originalSysOut.println("Running " + testClass.getClassName()));
         }
 
 

src/main/org/apache/tools/ant/taskdefs/optional/junitlauncher/StandaloneLauncher.java

@@ -146,11 +146,11 @@ public class StandaloneLauncher {
             }
             final String includeTags = reader.getAttributeValue(null, LD_XML_ATTR_INCLUDE_TAGS);
             if (includeTags != null) {
-                Stream.of(includeTags.split(",")).forEach(i -> forkedLaunch.addIncludeTag(i));
+                Stream.of(includeTags.split(",")).forEach(forkedLaunch::addIncludeTag);
             }
             final String excludeTags = reader.getAttributeValue(null, LD_XML_ATTR_EXCLUDE_TAGS);
             if (excludeTags != null) {
-                Stream.of(excludeTags.split(",")).forEach(e -> forkedLaunch.addExcludeTag(e));
+                Stream.of(excludeTags.split(",")).forEach(forkedLaunch::addExcludeTag);
             }
             final String printSummary = reader.getAttributeValue(null, LD_XML_ATTR_PRINT_SUMMARY);
             if (printSummary != null) {