错误消息 "[Ljava.lang.Object; cannot be cast to [Ljava.lang.String;" 表明在Java中尝试将一个对象数组(Object[]),其底层表示为 [Ljava.lang.Object;,强制转换为字符串数组(String[]),其底层表示为 [Ljava.lang.String;。在Java中,数组类型是具有协变性的,但这仅限于数组内部元素的向上转型(如从String[...
res = (Integer[])list.toArray(); 1. 2. 3. 4. 5. 6. 该代码能通过语法检查,但是在运行时会报类型转换错误,说明Object()不能简单地转换为其他类型的数组。 java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to [Ljava.lang.Integer; 1. 2.toArray(T[] a) // toArray(T[] ...
java.lang.ClassCastException: class [Ljava.lang.Object; cannot be cast to class look.word.po.Course 意思是 query.getSingleResult() 不能转换成 Course类 修改代码 执行结果: 【执行结果】:[1, Spring编程实战, 5, 2022-12-30, 88, 2022-09-19] 可以发现,query.getSingleResult() 返回的是一个数组...
vgDetails.setRouteName ((String)row[0]); routeList.add(vgDetails); } session.getTransaction().commit(); return routeList; } 错误是: java.lang.ClassCastException: java.lang.String cannot be cast to [Ljava.lang.Object; at com.claystone.server.user.UserListServiceImpl.getParticipantsDestination...
rep(); } } /* Output: [Ljava.lang.Object; cannot be cast to [Ljava.lang.Integer; */ 和以前一样,我们不能说 T[] array = new T[sz] ,所以我们创建了一个 Object 数组并将其强制转换。 rep() 方法返回一个 T[] ,在主方法中它应该是 gai 的Integer[] ,但是如果调用它并尝试将结...
[Ljava.lang.String; cannot be cast to java.lang.Long；一直报错，通过request.getParameterMap();得到的map里面的value为字符串数组 方法/步骤 1 public class PageData extends HashMap implements Map{private static final long serialVersionUID = 1L;Map map = null;HttpServletRequest request;public Page...
[Ljava/lang/String;)V"); if (startMeth == NULL) { ALOGE("JavaVM unable to find main() in '%s'\n", className); /* keep going */ } else { env->CallStaticVoidMethod(startClass, startMeth, strArray); #if 0 if (env->ExceptionCheck()) threadExitUncaughtException(env); #endif } ...
CLOUDSTACK-7463 UI: Domain Admin UI shows 'Add LDAP Users' button (should not be shown)... CLOUDSTACK-7417 Admin cannot archive or delete events for a deleted account... CLOUDSTACK-7412 Can't create proper template from VM on S3 secondary storage environment... CLOUDSTACK-7373 Incorrect Japan...
{List<Integer>list=newArrayList<>();list.add(1);list.add(2);list.add(3);//list.toArray() 返回的是一个 Object[] 类型的数组Integer[]arr=(Integer[])list.toArray();}//Exception in thread "main" java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to [Ljava.lang.Integer...
at java.lang.Thread.run(Thread.java:877) Caused by: java.lang.ClassCastException: [J cannot be cast to [Ljava.lang.Object; at org.apache.flink.table.data.conversion.ArrayObjectArrayConverter.toInternal(ArrayObjectArrayConverter.java:40)