增加淘宝群内容，修改部分文件组织

数据结构(双语)/数据结构 day16【瑞客论坛 www.ruike1.com】/代码/10-映射/src/com/mj/set/TreeSet.java

@@ -0,0 +1,48 @@
+package com.mj.set;
+
+import com.mj.map.Map;
+import com.mj.map.TreeMap;
+
+public class TreeSet<E> implements Set<E> {
+	Map<E, Object> map = new TreeMap<>(); 
+
+	@Override
+	public int size() {
+		return map.size();
+	}
+
+	@Override
+	public boolean isEmpty() {
+		return map.isEmpty();
+	}
+
+	@Override
+	public void clear() {
+		map.clear();
+	}
+
+	@Override
+	public boolean contains(E element) {
+		return map.containsKey(element);
+	}
+
+	@Override
+	public void add(E element) {
+		map.put(element, null);
+	}
+
+	@Override
+	public void remove(E element) {
+		map.remove(element);
+	}
+
+	@Override
+	public void traversal(Visitor<E> visitor) {
+		map.traversal(new Map.Visitor<E, Object>() {
+			public boolean visit(E key, Object value) {
+				return visitor.visit(key);
+			}
+		});
+	}
+
+}