add Reverse

Author: Liu

.gitignore

@@ -1 +1,2 @@
-/build/
+build/
+

.settings/org.eclipse.core.resources.prefs

@@ -0,0 +1,82 @@
+package containers;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Iterator;
+
+/**
+ * 利用迭代器实现字符串反转
+ * 
+ * @author liuyuning
+ * 
+ *
+ */
+public class Reverse {
+	@SuppressWarnings("serial")
+	private static class ReverseCollection<T> extends ArrayList<T> {
+
+		public ReverseCollection(Collection<T> collection) {
+			super(collection);
+		}
+
+		public Iterable<T> reverse() {
+			return new Iterable<T>() {
+
+				@Override
+				public Iterator<T> iterator() {
+					return new Iterator<T>() {
+						int current = size() - 1;
+
+						@Override
+						public boolean hasNext() {
+							return current > -1;
+						}
+
+						@Override
+						public T next() {
+							return get(current--);
+						}
+					};
+				}
+			};
+		}
+
+	}
+
+	/**
+	 * 
+	 * @param s
+	 * @return
+	 */
+	public static String reverseWords(String s) {
+		ReverseCollection<String> reverseCollection = new ReverseCollection<String>(Arrays.asList(s.split(" ")));
+		StringBuilder stringBuilder = new StringBuilder();
+		for (String word : reverseCollection.reverse()) {
+			stringBuilder.append(word + " ");
+		}
+		return stringBuilder.toString().trim();
+
+	}
+
+	/**
+	 * 
+	 * @param i
+	 * @Todo reverse int value
+	 */
+	public static int reverseInt(int i) {
+		boolean isNegative = false;
+
+		if (i < 0) {
+			isNegative = true;
+			i = -i;
+		}
+		return i;
+
+	}
+
+	public static void main(String[] args) {
+		String s = "This is a test for reversing words";
+		System.out.println(reverseWords(s));
+	}
+}