优化代码

mec-common/common-core/src/main/java/com/ym/mec/common/page/WrapperUtil.java

@@ -218,8 +218,7 @@ public class WrapperUtil<T> {
      */
     public static <O> void listDifference(List<O> a, List<O> b) {
         //将ab并集
-        Collection abUn = CollectionUtils.retainAll(a, b);
-        System.out.println(abUn);
+        Collection<O> abUn = CollectionUtils.retainAll(a, b);
         //删除a中abUn的值
         a.removeAll(abUn);
         //删除b中abUn的值