//param objArr   the expanded object of Array.          //param  newLength  the length of the new Array     public static Object getNewArr(Object objArr, int newLength) { if (!objArr.getClass().isArray()) {//判断类型 return null; } // get the array's componentType Class componentType = objArr.getClass().getComponentType();//获得类型 //get a newInstance of a Array object   Object newArray = Array.newInstance(componentType, newLength);//新建数组对象                //copy the array  System.arraycopy(objArr, 0, newArray, 0, Array.getLength(objArr));//把原数组数据copy到新建数组中，其中newLength要大于元objArr的length，否则此句报错 return newArray; }