类名改成别的，就可以了，你new ArrayList() 系统会认为你在new 当前类，而你写的当前类并没有实现List接口
二、出现The type List is not generic; it cannot be parameterized with arguments <String> 如果你的jsp页面中写了 List<Student> stuList = new ArrayList<Student>(); 系统可能默认给你导入 import java.swt.*; 包 此时需要将这个包改为 import java.util.*; 因为List是属于util包...
Collections.Generic.IEnumerable<char>繼承 Object String 實作 IEnumerable<Char> IEnumerable IComparable IComparable<String> IConvertible IEquatable<String> ICloneable IParsable<String> IParsable<TSelf> ISpanParsable<String> 備註如需此 API 的詳細資訊,請參閱 string的補充 API 備註。
The evaluation of wrapper1.task throws (we don't even get to evaluate wrapper1.state or the invocation) because the value of task in wrapper1 has a value whose type is not a subtype of the statically known type int Function(num). When we use .call, the types work out for .call its...
comparisonType 不是StringComparison 值。 NotSupportedException 不支持 StringComparison。 示例 以下示例比较字母“I”的三个版本。 结果受区域性选择、是否忽略大小写以及是否执行序号比较的影响。 C# 复制 // This example demonstrates the // System.String.Compare(String, String, StringComparison) method. usin...
你需要import java.util.Hashtable;你的本类的类名干扰了，改成别的名字，比如HashtableTest 从理论上说，不允许命名自己的类名为基本类库的类名
Until you do this, // the type is not generic, as the preceding and following // WriteLine statements show. The type parameter names are // specified as an array of strings. To make the code // easier to read, each GenericTypeParameterBuilder is placed // in a variable with the same...
"PostAsJsonAsync" is not invoking web api POST action method "System.Data.Entity.Internal.AppConfig" type initializer causes an exception "The given key was not present in the dictionary." when passing null non-Route paramater to ActionLink "The LINQ expression node type 'Invoke' is not suppor...
An element of parameterTypes is nulla null reference (Nothing in Visual Basic) orVoid. ArgumentNullException name is nulla null reference (Nothing in Visual Basic). NotSupportedException returnType is a type for whichType.IsByRefreturns true. ...
GetGenericTypeDefinition GetHashCode GetInterface GetInterfaceMap GetInterfaces GetMember GetMembers GetMethodImpl GetMethods GetNestedType GetNestedTypes GetProperties GetPropertyImpl HasElementTypeImpl InvokeMember IsArrayImpl IsAssignableFrom IsByRefImpl