villatee.blogg.se - Java reflection get static field value

Made available for access by other parts of a program. Instances of classes with blank final fields, before they are Is meaningful only during deserialization or reconstruction of If any of the above checks is not met, this method throws an the field's declaring class is not a record class.the field's declaring class is not a hidden class and.Write access if and only if the following conditions are met: If the underlying field is final, this Field object has

If the specified object argument is notĪn instance of the class or interface declaring the underlying Specified object argument is null, the method throws a Otherwise the underlying field is an instance field.

If the underlying field is static, the obj argument is Value is automatically unwrapped if the underlying field has a Specified object argument to the specified new value. Sets the field represented by this Field object on the ExceptionInInitializerError - if the initialization provoked NullPointerException - if the specified object is nullĪnd the field is an instance field. IllegalArgumentException - if the specified object is not anįield (or a subclass or implementor thereof). Is enforcing Java language access control and the underlyingįield is inaccessible. Object before being returned Throws: IllegalAccessException - if this Field object Obj primitive values are wrapped in an appropriate To be extracted Returns: the value of the represented field in object Parameters: obj - object from which the represented field's value is The field's value is obtained according to the preceding rules. If the field is hidden in the type of obj, Is wrapped in an object before being returned, otherwise it is If the field has a primitive type, the value Otherwise, the value is retrieved from the underlying instance If the underlying field is static, the class that declared theįield is initialized if it has not already been initialized.

The underlying field is inaccessible, the method throws an If this Field object is enforcing Java language access control, and Instance of the class or interface declaring the underlyingįield, the method throws an IllegalArgumentException. Specified obj argument is null, the method throws a Otherwise, the underlying field is an instance field. If the underlying field is a static field, the obj argument The underlying field's value is obtained as follows: Returns the value of the field represented by this Field, on

MethodHandles.privateLookupIn(, .Lookup).

Overrides: setAccessible in class AccessibleObject Parameters: flag - the new value for the accessible flag Throws: InaccessibleObjectException - if access cannot be enabled SecurityException - if the request is denied by the security manager See Also: ReflectPermission("suppressAccessChecks") permission. The accessible flag when true suppresses Java language accessĬontrol checks to only enable read access toĬheckPermission method is first called with a

final fields declared in a hidden class.

static final fields declared in any class or interface.

This method cannot be used to enable writeĪccess to a non-modifiable final field. To the caller and the package containing the declaring class is not open Protected constructors when the declaring class is in a different module Members with default (package) access, protected instance members, or This method cannot be used to enable access to private members, With no caller class on the stack to enable access to a memberĪ package that the module containing D exports unconditionally. So this method always succeeds when D is in an unnamed or

D is in a package that the module containing D opens to at least the moduleĪll packages in unnamed and open modules are open to all modules and.

Public in a package that the module containing DĮxports to at least the module containing C, and C

The member is public and D is public inĪ package that the module containing D exports to at least the module.

This method may be used by a caller in class C to enableĪccess to a member of declaring class D if any of the following hold: The reflected object should enforce checks for Java language accessĬontrol when it is used, with the variation noted in the class description. The reflected object should suppress checks for Java language accessĬontrol when it is used. Set the accessible flag for this reflected object to