3.TypeVariable 泛型的类型变量,指的是List、Map中的T,K,V等值,实际的Java类型是TypeVariableImpl(TypeVariable的子类);此外,还可以对类型变量加上extend限定,这样会有类型变量对应的上限; TypeVariable 在TypeVariable接口中,有3个方法,分别为getBounds()、getGenericDeclaration()、getName(); 3.1 getBounds 获得该...
function getVariableType(variable) { if (variable instanceof Array) { return "Array"; } else if (variable instanceof Date) { return "Date"; } else if (variable instanceof RegExp) { return "RegExp"; } else { return typeof variable; } } // 示例用法 var var1 = 10; var var2 = ...
// 方法 1String str1=Integer.toString(int num);String str2=Long.toString(long num);String str3=Float.toString(flaot num);String str4=Double.toString(double num);// 方法 2String str=""+num;// num 是 int、long、float、double 类型// 方法 3String str1=String.valueOf(int num);String ...
Assert.that(fv.getGenericType()instanceofTypeVariable,"必须为TypeVariable类型");TypeVariablekeyType=(TypeVariable)fk.getGenericType();TypeVariablevalueType=(TypeVariable)fv.getGenericType();// getName 方法System.out.println(keyType.getName());// KSystem.out.println(valueType.getName());// V...
所以我们无法通过反射API,在运行期获得Type Variable所代表的类型 但是这个特性导致我们在写工具类时会遇到一些困难。比如无法单独通过T来创建实例。如果T是一个非泛型类还好,我们可以通过直接传入类型信息进行一些操作 public static final <T> void foo(List<T> list, Class<T> tClass) ...
Returns the lower bound of this type variable. TypeMirror getUpperBound() Returns the upper bound of this type variable. Methods declared in interface javax.lang.model.type.TypeMirror accept,equals,getAnnotation,getAnnotationMirrors,getAnnotationsByType,getKind,hashCode,toString ...
GenericArrayType 在GenericArrayType接口中,仅有1个方法,就是getGenericComponentType(); 2.1 getGenericComponentType 返回泛型数组中元素的Type类型,即List<String>[] 中的 List<String>(ParameterizedTypeImpl)、T[] 中的T(TypeVariableImpl); 值得注意的是,无论是几维数组,getGenericComponentType()方法都只会脱去...
and all type arguments of p are created recursively. See TypeVariable for details on the creation process for type variables. Repeated creation of a parameterized type has no effect. Instances of classes that implement this interface must implement an equals() method that equates any two instances...
指的是List< T>、Map< K,V>中的T，K，V等值，实际的Java类型是TypeVariablestatic class Holder&...
TypeVariable is the common superinterface for type variables of kinds. A type variable is created the first time it is needed by a reflective method, as specified in this package. If a type variable t is referenced by a type (i.e, class, interface or annotation type) T, and T is decl...