Use private and final more in AbstractBiMap.

RELNOTES=n/a
PiperOrigin-RevId: 792172203

Author: cpovirk

android/guava/src/com/google/common/collect/AbstractBiMap.java

@@ -299,7 +299,7 @@ public Set<Entry<K, V>> entrySet() {
     return (result == null) ? entrySet = new EntrySet() : result;
   }
 
-  class BiMapEntry extends ForwardingMapEntry<K, V> {
+  private final class BiMapEntry extends ForwardingMapEntry<K, V> {
     private final Entry<K, V> delegate;
 
     BiMapEntry(Entry<K, V> delegate) {
@@ -432,7 +432,7 @@ public boolean retainAll(Collection<?> c) {
   }
 
   /** The inverse of any other {@code AbstractBiMap} subclass. */
-  static class Inverse<K extends @Nullable Object, V extends @Nullable Object>
+  private static final class Inverse<K extends @Nullable Object, V extends @Nullable Object>
       extends AbstractBiMap<K, V> {
     Inverse(Map<K, V> backward, AbstractBiMap<V, K> forward) {
       super(backward, forward);

guava/src/com/google/common/collect/AbstractBiMap.java

@@ -323,7 +323,7 @@ public Set<Entry<K, V>> entrySet() {
     return (result == null) ? entrySet = new EntrySet() : result;
   }
 
-  class BiMapEntry extends ForwardingMapEntry<K, V> {
+  private final class BiMapEntry extends ForwardingMapEntry<K, V> {
     private final Entry<K, V> delegate;
 
     BiMapEntry(Entry<K, V> delegate) {
@@ -456,7 +456,7 @@ public boolean retainAll(Collection<?> c) {
   }
 
   /** The inverse of any other {@code AbstractBiMap} subclass. */
-  static class Inverse<K extends @Nullable Object, V extends @Nullable Object>
+  private static final class Inverse<K extends @Nullable Object, V extends @Nullable Object>
       extends AbstractBiMap<K, V> {
     Inverse(Map<K, V> backward, AbstractBiMap<V, K> forward) {
       super(backward, forward);