diff --git a/core/src/main/java/hudson/model/LoadBalancer.java b/core/src/main/java/hudson/model/LoadBalancer.java
index 37446a181e..22a4b4097c 100644
--- a/core/src/main/java/hudson/model/LoadBalancer.java
+++ b/core/src/main/java/hudson/model/LoadBalancer.java
@@ -83,11 +83,7 @@ public abstract class LoadBalancer implements ExtensionPoint {
             // build consistent hash for each work chunk
             List<ConsistentHash<ExecutorChunk>> hashes = new ArrayList<>(ws.works.size());
             for (int i=0; i<ws.works.size(); i++) {
-                ConsistentHash<ExecutorChunk> hash = new ConsistentHash<>(new Hash<ExecutorChunk>() {
-                    public String hash(ExecutorChunk node) {
-                        return node.getName();
-                    }
-                });
+                ConsistentHash<ExecutorChunk> hash = new ConsistentHash<>(ExecutorChunk::getName);
 
                 // Build a Map to pass in rather than repeatedly calling hash.add() because each call does lots of expensive work
                 List<ExecutorChunk> chunks = ws.works(i).applicableExecutorChunks();
diff --git a/core/src/main/java/hudson/util/ProcessTree.java b/core/src/main/java/hudson/util/ProcessTree.java
index 0b35c67da3..e7bd30cc27 100644
--- a/core/src/main/java/hudson/util/ProcessTree.java
+++ b/core/src/main/java/hudson/util/ProcessTree.java
@@ -741,11 +741,7 @@ public abstract class ProcessTree implements Iterable<OSProcess>, IProcessTree,
         ProcfsUnix(boolean vetoersExist) {
             super(vetoersExist);
             
-            File[] processes = new File("/proc").listFiles(new FileFilter() {
-                public boolean accept(File f) {
-                    return f.isDirectory();
-                }
-            });
+            File[] processes = new File("/proc").listFiles(File::isDirectory);
             if(processes==null) {
                 LOGGER.info("No /proc");
                 return;
diff --git a/test/src/test/java/jenkins/security/ApiTokenPropertyTest.java b/test/src/test/java/jenkins/security/ApiTokenPropertyTest.java
index dd017c7f27..7368140592 100644
--- a/test/src/test/java/jenkins/security/ApiTokenPropertyTest.java
+++ b/test/src/test/java/jenkins/security/ApiTokenPropertyTest.java
@@ -84,11 +84,7 @@ public class ApiTokenPropertyTest {
 
         // test the authentication via Token
         WebClient wc = createClientForUser("foo");
-        assertEquals(u, wc.executeOnServer(new Callable<User>() {
-            public User call() throws Exception {
-                return User.current();
-            }
-        }));
+        assertEquals(u, wc.executeOnServer(User::current));
         
         // Make sure the UI shows the token to the user
         HtmlPage config = wc.goTo(u.getUrl() + "/configure");