Update ArrayList.java

ikook-wang · ikook-wang · commit 6306e8077219 · 2017-02-26T10:44:15.000+08:00
diff --git a/group18/935542673/Coding/20170219/src/com/ikook/basic_data_structure/MyArrayList.java b/group18/935542673/Coding/20170219/src/com/ikook/basic_data_structure/MyArrayList.java
@@ -51,7 +51,9 @@ public void add(Object obj) {
 	 * @param obj
 	 */
 	public void add(int index, Object obj) {
-		rangeCheck(index);
+		if (index > size || index < 0)
+            throw new IndexOutOfBoundsException("索引越界异常");
+		
 		ensureCapacity();
 	
 		System.arraycopy(elementData, index, elementData, index + 1, size-index);
@@ -151,11 +153,7 @@ private void ensureCapacity() {
 	 */
 	private void rangeCheck(int index) {
 		if(index < 0 || index >= size) {
-			try {
-				throw new Exception("索引异常");
-			} catch (Exception e) {
-				e.printStackTrace();
-			}
+			throw new IndexOutOfBoundsException("索引越界异常");
 		}
 	}
 	
