贴一段数组动态扩容的代码

public static Object arrayGrow(Object obj,int addlength){
        Class c = obj.getClass();
if(!c.isArray()){
return null;
        }
        Class type = c.getComponentType();
int length = Array.getLength(obj);
int newlength = length+addlength;
        Object newArray = Array.newInstance(type, newlength);
        System.arraycopy(obj, 0, newArray, 0, length);
return newArray;
    }