diff --git a/core/src/main/java/hudson/BulkChange.java b/core/src/main/java/hudson/BulkChange.java
index 35bdf66cb4..69ff455829 100644
--- a/core/src/main/java/hudson/BulkChange.java
+++ b/core/src/main/java/hudson/BulkChange.java
@@ -160,9 +160,6 @@ public class BulkChange implements Closeable {
      * all the save operations by making the {@link #contains(Saveable)} method return
      * true for everything.
      */
-    public static final Saveable ALL = new Saveable() {
-        @Override
-        public void save() {
-        }
+    public static final Saveable ALL = () -> {
     };
 }
diff --git a/core/src/main/java/hudson/ClassicPluginStrategy.java b/core/src/main/java/hudson/ClassicPluginStrategy.java
index 19f04f0168..34cc9e246a 100644
--- a/core/src/main/java/hudson/ClassicPluginStrategy.java
+++ b/core/src/main/java/hudson/ClassicPluginStrategy.java
@@ -83,12 +83,7 @@ public class ClassicPluginStrategy implements PluginStrategy {
     /**
      * Filter for jar files.
      */
-    private static final FilenameFilter JAR_FILTER = new FilenameFilter() {
-        @Override
-        public boolean accept(File dir,String name) {
-            return name.endsWith(".jar");
-        }
-    };
+    private static final FilenameFilter JAR_FILTER = (dir, name) -> name.endsWith(".jar");
 
     private PluginManager pluginManager;
 
diff --git a/core/src/main/java/hudson/ExtensionFinder.java b/core/src/main/java/hudson/ExtensionFinder.java
index da23b5b01d..12df256b6a 100644
--- a/core/src/main/java/hudson/ExtensionFinder.java
+++ b/core/src/main/java/hudson/ExtensionFinder.java
@@ -543,12 +543,7 @@ public abstract class ExtensionFinder implements ExtensionPoint {
                             // make unique key, because Guice wants that.
                             Key key = Key.get(extType, Names.named(item.className() + "." + item.memberName()));
                             annotations.put(key,a);
-                            bind(key).toProvider(new Provider() {
-                                    @Override
-                                    public Object get() {
-                                        return instantiate(item);
-                                    }
-                                }).in(scope);
+                            bind(key).toProvider(() -> instantiate(item)).in(scope);
                         }
                         loadedIndex.add(item);
                     } catch (Exception|LinkageError e) {
diff --git a/core/src/main/java/hudson/FilePath.java b/core/src/main/java/hudson/FilePath.java
index f785d0c881..c2f612f18e 100644
--- a/core/src/main/java/hudson/FilePath.java
+++ b/core/src/main/java/hudson/FilePath.java
@@ -3365,12 +3365,7 @@ public final class FilePath implements SerializableOnlyOverRemoting {
         private static final long serialVersionUID = 1L;
     }
 
-    private static final Comparator<String> SHORTER_STRING_FIRST = new Comparator<String>() {
-        @Override
-        public int compare(String o1, String o2) {
-            return o1.length()-o2.length();
-        }
-    };
+    private static final Comparator<String> SHORTER_STRING_FIRST = (o1, o2) -> o1.length() - o2.length();
 
     /**
      * Gets the {@link FilePath} representation of the "~" directory
diff --git a/core/src/main/java/hudson/model/AbstractProject.java b/core/src/main/java/hudson/model/AbstractProject.java
index 32148e0c46..59632484ec 100644
--- a/core/src/main/java/hudson/model/AbstractProject.java
+++ b/core/src/main/java/hudson/model/AbstractProject.java
@@ -1982,12 +1982,7 @@ public abstract class AbstractProject<P extends AbstractProject<P,R>,R extends A
         return Items.findNearest(AbstractProject.class, name, context);
     }
 
-    private static final Comparator<Integer> REVERSE_INTEGER_COMPARATOR = new Comparator<Integer>() {
-        @Override
-        public int compare(Integer o1, Integer o2) {
-            return o2-o1;
-        }
-    };
+    private static final Comparator<Integer> REVERSE_INTEGER_COMPARATOR = (o1, o2) -> o2 - o1;
 
     private static final Logger LOGGER = Logger.getLogger(AbstractProject.class.getName());
 
diff --git a/core/src/main/java/hudson/model/BooleanParameterValue.java b/core/src/main/java/hudson/model/BooleanParameterValue.java
index 36242f3c51..7ca9cbbff0 100644
--- a/core/src/main/java/hudson/model/BooleanParameterValue.java
+++ b/core/src/main/java/hudson/model/BooleanParameterValue.java
@@ -64,12 +64,7 @@ public class BooleanParameterValue extends ParameterValue {
 
     @Override
     public VariableResolver<String> createVariableResolver(AbstractBuild<?, ?> build) {
-        return new VariableResolver<String>() {
-            @Override
-            public String resolve(String name) {
-                return BooleanParameterValue.this.name.equals(name) ? Boolean.toString(value) : null;
-            }
-        };
+        return name -> BooleanParameterValue.this.name.equals(name) ? Boolean.toString(value) : null;
     }
 
     @Override
diff --git a/core/src/main/java/hudson/model/DependencyGraph.java b/core/src/main/java/hudson/model/DependencyGraph.java
index 7fcb6673c4..18e8d64b60 100644
--- a/core/src/main/java/hudson/model/DependencyGraph.java
+++ b/core/src/main/java/hudson/model/DependencyGraph.java
@@ -130,12 +130,7 @@ public class DependencyGraph implements Comparator<AbstractProject> {
             }
         }
 
-        topologicalOrder = new Comparator<AbstractProject<?, ?>>() {
-            @Override
-            public int compare(AbstractProject<?,?> o1, AbstractProject<?,?> o2) {
-                return topoOrder.get(o1)-topoOrder.get(o2);
-            }
-        };
+        topologicalOrder = Comparator.comparingInt(topoOrder::get);
 
         topologicallySorted = Collections.unmodifiableList(topologicallySorted);
     }
diff --git a/core/src/main/java/hudson/model/FileParameterValue.java b/core/src/main/java/hudson/model/FileParameterValue.java
index 1213ce28a7..f2c2977a13 100644
--- a/core/src/main/java/hudson/model/FileParameterValue.java
+++ b/core/src/main/java/hudson/model/FileParameterValue.java
@@ -133,12 +133,7 @@ public class FileParameterValue extends ParameterValue {
 
     @Override
     public VariableResolver<String> createVariableResolver(AbstractBuild<?, ?> build) {
-        return new VariableResolver<String>() {
-            @Override
-            public String resolve(String name) {
-                return FileParameterValue.this.name.equals(name) ? originalFileName : null;
-            }
-        };
+        return name -> FileParameterValue.this.name.equals(name) ? originalFileName : null;
     }
 
     /**
diff --git a/core/src/main/java/hudson/model/ItemGroupMixIn.java b/core/src/main/java/hudson/model/ItemGroupMixIn.java
index fc050f6078..c9020b521d 100644
--- a/core/src/main/java/hudson/model/ItemGroupMixIn.java
+++ b/core/src/main/java/hudson/model/ItemGroupMixIn.java
@@ -41,7 +41,6 @@ import javax.xml.transform.TransformerException;
 import javax.xml.transform.stream.StreamResult;
 import javax.xml.transform.stream.StreamSource;
 import java.io.File;
-import java.io.FileFilter;
 import java.io.IOException;
 import java.io.InputStream;
 import java.nio.file.Files;
@@ -101,12 +100,7 @@ public abstract class ItemGroupMixIn {
     public static <K,V extends Item> Map<K,V> loadChildren(ItemGroup parent, File modulesDir, Function1<? extends K,? super V> key) {
         modulesDir.mkdirs(); // make sure it exists
 
-        File[] subdirs = modulesDir.listFiles(new FileFilter() {
-            @Override
-            public boolean accept(File child) {
-                return child.isDirectory();
-            }
-        });
+        File[] subdirs = modulesDir.listFiles(File::isDirectory);
         CopyOnWriteMap.Tree<K,V> configurations = new CopyOnWriteMap.Tree<>();
         for (File subdir : subdirs) {
             try {
@@ -135,12 +129,7 @@ public abstract class ItemGroupMixIn {
     /**
      * {@link Item} → name function.
      */
-    public static final Function1<String,Item> KEYED_BY_NAME = new Function1<String, Item>() {
-        @Override
-        public String call(Item item) {
-            return item.getName();
-        }
-    };
+    public static final Function1<String,Item> KEYED_BY_NAME = Item::getName;
 
     /**
      * Creates a {@link TopLevelItem} for example from the submission of the {@code /lib/hudson/newFromList/form} tag
diff --git a/core/src/main/java/hudson/model/PasswordParameterValue.java b/core/src/main/java/hudson/model/PasswordParameterValue.java
index 35c6bbfaa0..dd59b97a2d 100644
--- a/core/src/main/java/hudson/model/PasswordParameterValue.java
+++ b/core/src/main/java/hudson/model/PasswordParameterValue.java
@@ -65,12 +65,7 @@ public class PasswordParameterValue extends ParameterValue {
 
     @Override
     public VariableResolver<String> createVariableResolver(AbstractBuild<?, ?> build) {
-        return new VariableResolver<String>() {
-            @Override
-            public String resolve(String name) {
-                return PasswordParameterValue.this.name.equals(name) ? Secret.toString(value) : null;
-            }
-        };
+        return name -> PasswordParameterValue.this.name.equals(name) ? Secret.toString(value) : null;
     }
 
     @Override
diff --git a/core/src/main/java/hudson/model/RunMap.java b/core/src/main/java/hudson/model/RunMap.java
index d7a22c0905..1867a97e2c 100644
--- a/core/src/main/java/hudson/model/RunMap.java
+++ b/core/src/main/java/hudson/model/RunMap.java
@@ -159,12 +159,7 @@ public final class RunMap<R extends Run<?,R>> extends AbstractLazyLoadRunMap<R>
      *      Use {@link ReverseComparator}
      */
     @Deprecated
-    public static final Comparator<Comparable> COMPARATOR = new Comparator<Comparable>() {
-        @Override
-        public int compare(Comparable o1, Comparable o2) {
-            return o2.compareTo(o1);
-        }
-    };
+    public static final Comparator<Comparable> COMPARATOR = Comparator.reverseOrder();
 
     /**
      * {@link Run} factory.
diff --git a/core/src/main/java/hudson/model/Saveable.java b/core/src/main/java/hudson/model/Saveable.java
index 49b65af7f8..a2e8b8f9a4 100644
--- a/core/src/main/java/hudson/model/Saveable.java
+++ b/core/src/main/java/hudson/model/Saveable.java
@@ -52,9 +52,6 @@ public interface Saveable {
      * {@link Saveable} that doesn't save anything.
      * @since 1.301.
      */
-    Saveable NOOP = new Saveable() {
-        @Override
-        public void save() throws IOException {
-        }
+    Saveable NOOP = () -> {
     };
 }
diff --git a/core/src/main/java/hudson/model/StringParameterValue.java b/core/src/main/java/hudson/model/StringParameterValue.java
index da66ff65b7..5a7074adde 100644
--- a/core/src/main/java/hudson/model/StringParameterValue.java
+++ b/core/src/main/java/hudson/model/StringParameterValue.java
@@ -63,12 +63,7 @@ public class StringParameterValue extends ParameterValue {
 
     @Override
     public VariableResolver<String> createVariableResolver(AbstractBuild<?, ?> build) {
-        return new VariableResolver<String>() {
-            @Override
-            public String resolve(String name) {
-                return StringParameterValue.this.name.equals(name) ? value : null;
-            }
-        };
+        return name -> StringParameterValue.this.name.equals(name) ? value : null;
     }
 
     @Override
diff --git a/core/src/main/java/hudson/model/View.java b/core/src/main/java/hudson/model/View.java
index 26b1f2414f..6e13fcd577 100644
--- a/core/src/main/java/hudson/model/View.java
+++ b/core/src/main/java/hudson/model/View.java
@@ -1307,12 +1307,7 @@ public abstract class View extends AbstractModelObject implements AccessControll
         return r;
     }
 
-    public static final Comparator<View> SORTER = new Comparator<View>() {
-        @Override
-        public int compare(View lhs, View rhs) {
-            return lhs.getViewName().compareTo(rhs.getViewName());
-        }
-    };
+    public static final Comparator<View> SORTER = Comparator.comparing(View::getViewName);
 
     public static final PermissionGroup PERMISSIONS = new PermissionGroup(View.class,Messages._View_Permissions_Title());
     /**
diff --git a/core/src/main/java/hudson/model/queue/QueueSorter.java b/core/src/main/java/hudson/model/queue/QueueSorter.java
index 6c9d865240..13b830cf87 100644
--- a/core/src/main/java/hudson/model/queue/QueueSorter.java
+++ b/core/src/main/java/hudson/model/queue/QueueSorter.java
@@ -27,12 +27,7 @@ public abstract class QueueSorter implements ExtensionPoint {
      *
      * @since 1.618
      */
-    public static final Comparator<Queue.BlockedItem> DEFAULT_BLOCKED_ITEM_COMPARATOR = new Comparator<Queue.BlockedItem>() {
-        @Override
-        public int compare(Queue.BlockedItem o1, Queue.BlockedItem o2) {
-            return Long.compare(o1.getInQueueSince(), o2.getInQueueSince());
-        }
-    };
+    public static final Comparator<Queue.BlockedItem> DEFAULT_BLOCKED_ITEM_COMPARATOR = Comparator.comparingLong(Queue.Item::getInQueueSince);
 
     /**
      * Sorts the buildable items list. The items at the beginning will be executed
diff --git a/core/src/main/java/hudson/security/Permission.java b/core/src/main/java/hudson/security/Permission.java
index 3ebe8c4100..b51667150c 100644
--- a/core/src/main/java/hudson/security/Permission.java
+++ b/core/src/main/java/hudson/security/Permission.java
@@ -53,15 +53,7 @@ public final class Permission {
     /**
      * Comparator that orders {@link Permission} objects based on their ID.
      */
-    public static final Comparator<Permission> ID_COMPARATOR = new Comparator<Permission>() {
-
-        // break eclipse compilation 
-        //Override
-        @Override
-        public int compare(@NonNull Permission one, @NonNull Permission two) {
-            return one.getId().compareTo(two.getId());
-        }
-    };
+    public static final Comparator<Permission> ID_COMPARATOR = Comparator.comparing(Permission::getId);
 
     public final @NonNull Class owner;
 
diff --git a/core/src/main/java/hudson/util/FileVisitor.java b/core/src/main/java/hudson/util/FileVisitor.java
index c8503d5689..31572a8372 100644
--- a/core/src/main/java/hudson/util/FileVisitor.java
+++ b/core/src/main/java/hudson/util/FileVisitor.java
@@ -67,12 +67,7 @@ public abstract class FileVisitor {
                 visitor.visit(f,relativePath);
         }
 
-        private static final FileFilter PASS_THROUGH = new FileFilter() {
-            @Override
-            public boolean accept(File pathname) {
-                return true;
-            }
-        };
+        private static final FileFilter PASS_THROUGH = pathname -> true;
 
         private static final long serialVersionUID = 1L;
     }
diff --git a/core/src/main/java/hudson/util/TableNestChecker.java b/core/src/main/java/hudson/util/TableNestChecker.java
index a6d54242e6..0ebe1a7ab5 100644
--- a/core/src/main/java/hudson/util/TableNestChecker.java
+++ b/core/src/main/java/hudson/util/TableNestChecker.java
@@ -98,12 +98,7 @@ public class TableNestChecker extends XMLFilterImpl {
         boolean isAllowed(String childTag);
     }
 
-    private static final Checker ALL_ALLOWED = new Checker() {
-        @Override
-        public boolean isAllowed(String childTag) {
-            return true;
-        }
-    };
+    private static final Checker ALL_ALLOWED = childTag -> true;
 
     private static final class InList implements Checker {
         private final Set<String> tags;
diff --git a/core/src/main/java/hudson/util/VariableResolver.java b/core/src/main/java/hudson/util/VariableResolver.java
index 420e8bd8f7..859ccb1abe 100644
--- a/core/src/main/java/hudson/util/VariableResolver.java
+++ b/core/src/main/java/hudson/util/VariableResolver.java
@@ -55,12 +55,7 @@ public interface VariableResolver<V> {
     /**
      * Empty resolver that always returns null.
      */
-    VariableResolver NONE = new VariableResolver() {
-        @Override
-        public Object resolve(String name) {
-            return null;
-        }
-    };
+    VariableResolver NONE = name -> null;
 
     /**
      * {@link VariableResolver} backed by a {@link Map}.
diff --git a/core/src/main/java/hudson/views/MyViewsTabBar.java b/core/src/main/java/hudson/views/MyViewsTabBar.java
index d2d29e4769..8e2dc7302f 100644
--- a/core/src/main/java/hudson/views/MyViewsTabBar.java
+++ b/core/src/main/java/hudson/views/MyViewsTabBar.java
@@ -83,12 +83,7 @@ public abstract class MyViewsTabBar extends AbstractDescribableImpl<MyViewsTabBa
     @SuppressWarnings("unused") // invoked from stapler view
     public List<View> sort(@NonNull List<? extends View> views) {
         List<View> result = new ArrayList<>(views);
-        result.sort(new Comparator<View>() {
-            @Override
-            public int compare(View o1, View o2) {
-                return o1.getDisplayName().compareTo(o2.getDisplayName());
-            }
-        });
+        result.sort(Comparator.comparing(View::getDisplayName));
         return result;
     }
 
diff --git a/core/src/main/java/hudson/views/ViewsTabBar.java b/core/src/main/java/hudson/views/ViewsTabBar.java
index 93aa308456..a6dd64c7b6 100644
--- a/core/src/main/java/hudson/views/ViewsTabBar.java
+++ b/core/src/main/java/hudson/views/ViewsTabBar.java
@@ -83,12 +83,7 @@ public abstract class ViewsTabBar extends AbstractDescribableImpl<ViewsTabBar> i
     @SuppressWarnings("unused") // invoked from stapler view
     public List<View> sort(@NonNull List<? extends View> views) {
         List<View> result = new ArrayList<>(views);
-        result.sort(new Comparator<View>() {
-            @Override
-            public int compare(View o1, View o2) {
-                return o1.getDisplayName().compareTo(o2.getDisplayName());
-            }
-        });
+        result.sort(Comparator.comparing(View::getDisplayName));
         return result;
     }
 
diff --git a/core/src/main/java/jenkins/model/Nodes.java b/core/src/main/java/jenkins/model/Nodes.java
index 5e4ff79227..9ad71092de 100644
--- a/core/src/main/java/jenkins/model/Nodes.java
+++ b/core/src/main/java/jenkins/model/Nodes.java
@@ -42,7 +42,6 @@ import org.kohsuke.accmod.restrictions.NoExternalUse;
 import edu.umd.cs.findbugs.annotations.CheckForNull;
 import edu.umd.cs.findbugs.annotations.NonNull;
 import java.io.File;
-import java.io.FileFilter;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collection;
@@ -306,12 +305,8 @@ public class Nodes implements Saveable {
             xmlFile.write(n);
             SaveableListener.fireOnChange(this, xmlFile);
         }
-        for (File forDeletion : nodesDir.listFiles(new FileFilter() {
-            @Override
-            public boolean accept(File pathname) {
-                return pathname.isDirectory() && !existing.contains(pathname.getName());
-            }
-        })) {
+        for (File forDeletion : nodesDir.listFiles(pathname ->
+                pathname.isDirectory() && !existing.contains(pathname.getName()))) {
             Util.deleteRecursive(forDeletion);
         }
     }
@@ -334,12 +329,7 @@ public class Nodes implements Saveable {
      */
     public void load() throws IOException {
         final File nodesDir = getNodesDir();
-        final File[] subdirs = nodesDir.listFiles(new FileFilter() {
-            @Override
-            public boolean accept(File child) {
-                return child.isDirectory();
-            }
-        });
+        final File[] subdirs = nodesDir.listFiles(File::isDirectory);
         final Map<String, Node> newNodes = new TreeMap<>();
         if (subdirs != null) {
             for (File subdir : subdirs) {
diff --git a/core/src/main/java/jenkins/security/s2m/ConfigDirectory.java b/core/src/main/java/jenkins/security/s2m/ConfigDirectory.java
index 9905d10344..9a4bfef702 100644
--- a/core/src/main/java/jenkins/security/s2m/ConfigDirectory.java
+++ b/core/src/main/java/jenkins/security/s2m/ConfigDirectory.java
@@ -3,7 +3,6 @@ package jenkins.security.s2m;
 import java.io.BufferedReader;
 import java.io.File;
 import java.io.FileReader;
-import java.io.FilenameFilter;
 import java.io.IOException;
 import java.util.Arrays;
 import java.util.Collection;
@@ -31,12 +30,7 @@ abstract class ConfigDirectory<T,COL extends Collection<T>> extends ConfigFile<T
         COL result = create();
 
         if (dir.exists()) {
-            String[] fragments = dir.list(new FilenameFilter() {
-                @Override
-                public boolean accept(File dir, String name) {
-                    return name.endsWith(".conf");
-                }
-            });
+            String[] fragments = dir.list((dir, name) -> name.endsWith(".conf"));
             if (fragments!=null) {
                 Arrays.sort(fragments);
 
diff --git a/core/src/main/java/jenkins/security/s2m/FilePathRuleConfig.java b/core/src/main/java/jenkins/security/s2m/FilePathRuleConfig.java
index f6f5b8ed3d..ead011f6c2 100644
--- a/core/src/main/java/jenkins/security/s2m/FilePathRuleConfig.java
+++ b/core/src/main/java/jenkins/security/s2m/FilePathRuleConfig.java
@@ -69,12 +69,7 @@ class FilePathRuleConfig extends ConfigDirectory<FilePathRule,List<FilePathRule>
             return OpMatcher.ALL;
 
         final Set<String> ops = Collections.unmodifiableSet(new HashSet<>(Arrays.asList(token.split(","))));
-        return new OpMatcher() {
-            @Override
-            public boolean matches(String op) {
-                return ops.contains(op);
-            }
-        };
+        return ops::contains;
     }
 
     public boolean checkFileAccess(String op, File path) throws SecurityException {
diff --git a/core/src/main/java/jenkins/security/s2m/OpMatcher.java b/core/src/main/java/jenkins/security/s2m/OpMatcher.java
index 7cb83623a2..ce6dc69ca6 100644
--- a/core/src/main/java/jenkins/security/s2m/OpMatcher.java
+++ b/core/src/main/java/jenkins/security/s2m/OpMatcher.java
@@ -12,10 +12,5 @@ import java.io.File;
 interface OpMatcher {
     boolean matches(String op);
 
-    OpMatcher ALL = new OpMatcher() {
-        @Override
-        public boolean matches(String op) {
-            return true;
-        }
-    };
+    OpMatcher ALL = op -> true;
 }
diff --git a/core/src/main/java/jenkins/util/groovy/GroovyHookScript.java b/core/src/main/java/jenkins/util/groovy/GroovyHookScript.java
index 8985e9fd07..ee30a17d69 100644
--- a/core/src/main/java/jenkins/util/groovy/GroovyHookScript.java
+++ b/core/src/main/java/jenkins/util/groovy/GroovyHookScript.java
@@ -4,7 +4,6 @@ import groovy.lang.Binding;
 import groovy.lang.GroovyCodeSource;
 import groovy.lang.GroovyShell;
 import java.io.File;
-import java.io.FileFilter;
 import java.io.IOException;
 import java.net.URL;
 import java.util.Arrays;
@@ -100,12 +99,7 @@ public class GroovyHookScript {
 
         File scriptD = new File(rootDir, hookGroovyD);
         if (scriptD.isDirectory()) {
-            File[] scripts = scriptD.listFiles(new FileFilter() {
-                @Override
-                public boolean accept(File f) {
-                    return f.getName().endsWith(".groovy");
-                }
-            });
+            File[] scripts = scriptD.listFiles(f -> f.getName().endsWith(".groovy"));
             if (scripts!=null) {
                 // sort to run them in a deterministic order
                 Arrays.sort(scripts);