--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/goodjava/util/SoftCacheMap.java	Fri May 08 18:07:14 2020 -0600
@@ -0,0 +1,35 @@
+package goodjava.util;
+
+import java.lang.ref.ReferenceQueue;
+import java.lang.ref.SoftReference;
+
+
+public final class SoftCacheMap<K,V> extends CacheMap<K,V> {
+
+	static final class MySoftReference<K,V> extends SoftReference<V> implements MyReference<K,V> {
+		private final K key;
+
+		MySoftReference(K key,V value,ReferenceQueue<V> q) {
+			super(value,q);
+			this.key = key;
+		}
+
+		public K key() {
+			return key;
+		}
+
+		public boolean equals(Object obj) {
+			Object o = this.get();
+			if( o==null )
+				return false;
+			SoftReference ref = (SoftReference)obj;
+			return o.equals(ref.get());
+		}
+
+	}
+
+	protected MyReference<K,V> newReference(K key,V value,ReferenceQueue<V> q) {
+		return new MySoftReference<K,V>(key,value,q);
+	}
+
+}