Implementazione parziale Priority Queue

exceptions/EmptyPriorityQueueException.java

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+package exceptions;
+
+/**
+ * Signals that the boundaries of a data structure have been illegally
+ * traversed (e.g. past the end of a list).
+ * @author Roberto Tamassia
+ */
+//Copyright (c) 2003 Brown University, Providence, RI
+//Additional modifications and methods by xgiovio
+
+public class EmptyPriorityQueueException extends RuntimeException {
+  public EmptyPriorityQueueException(String message) {
+    super (message);
+  }
+    public EmptyPriorityQueueException() {
+        super ("EmptyPriorityQueueException");
+    }
+}

priorityqueue/Entry.java

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+package priorityqueue;
+
+/**
+ * Created with xgiovio.macbookair.
+ * User: xgiovio
+ * Date: 01/04/14
+ * Time: 16:27
+ */
+public interface Entry<K,V> {
+    public K getKey();
+    public V getValue();
+}

priorityqueue/PriorityQueue.java

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+package priorityqueue;
+
+import exceptions.EmptyPriorityQueueException;
+import java.security.InvalidKeyException;
+
+/**
+ * Created with xgiovio.macbookair.
+ * User: xgiovio
+ * Date: 01/04/14
+ * Time: 16:29
+ */
+public interface PriorityQueue<K,V> {
+    public int size();
+    public boolean isEmpty();
+    public Entry<K,V> min() throws EmptyPriorityQueueException;
+    public Entry<K,V> insert(K key, V value) throws InvalidKeyException;
+    public Entry<K,V> removeMin() throws EmptyPriorityQueueException;
+}