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For primitive types and arrays, we can use static variable class. We can get Class of an object using three methods - through static variable class, using getClass() method of object and (String full圜lassifiedClassName). Let’s look at some of the important refection methods for classes. Package class ConcreteClass extends BaseClass implements BaseInterface
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In this section, we will look into important methods of Class, for convenience, I am creating some classes and interfaces with inheritance hierarchy. For every type of object, JVM instantiates an immutable instance of that provides methods to examine the runtime properties of the object and create new objects, invoke its method and get/set object fields. is the entry point for all the reflection operations. Primitive types are - boolean, byte, short, int, long, char, float, and double. All the classes, enums, arrays are reference types and inherit from. In java, every object is either a primitive type or reference.
#Java reflection get static field value code
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Reflection in Java is one of the advance topic of core java.
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Import Reflection provides ability to inspect and modify the runtime behavior of application. The following example shows the usage of .get(Object obj) method. NullPointerException − if the specified object is null and the field is an instance field.ĮxceptionInInitializerError − if the initialization provoked by this method fails. IllegalArgumentException − if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof). IllegalAccessException − if this Field object is enforcing Java language access control and the underlying field is inaccessible. The value of the represented field in object obj primitive values are wrapped in an appropriate object before being returned. Obj − object from which the represented field's value is to be extracted. Throws IllegalArgumentException, IllegalAccessException Declarationįollowing is the declaration for .get(Object obj) method. The value is automatically wrapped in an object if it has a primitive type. The .get(Object obj) method returns the value of the field represented by this Field, on the specified object.