Added methods isEmpty(), putAll(), toArray() to interfaces List and Map

classpath/java/util/Hashtable.java

@@ -15,6 +15,10 @@ public class Hashtable<K, V> implements Map<K, V> {
     return map.toString();
   }
 
+  public synchronized boolean isEmpty() {
+    return map.isEmpty();
+  }
+
   public synchronized int size() {
     return map.size();
   }
@@ -35,6 +39,10 @@ public class Hashtable<K, V> implements Map<K, V> {
     return map.put(key, value);
   }
 
+  public synchronized void putAll(Map<? extends K,? extends V> elts) {
+    map.putAll(elts);
+  }
+
   public synchronized V remove(K key) {
     return map.remove(key);
   }