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Java reflection compilation example5/18/2023 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. Reflection is a powerful tool it allows Java to do things that would otherwise be either impossible or require large amounts of boilerplate code. IllegalArgumentException − if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof). Annotations provide information to a program at compile time or at runtime based on which the program can take further action. Because these fields are usually private, the class uses tAccessible(java.lang. IllegalAccessException − if this Field object is enforcing Java language access control and the underlying field is inaccessible. FebruJava Table Of Contents An annotation is a construct associated with Java source code elements such as classes, methods, and variables. This class uses reflection to determine the fields to append. 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. Demonstration of speed of reflexive versus. Provides a set of static methods that extend the Java metaobject 16. The .get(Object obj) method returns the value of the field represented by this Field, on the specified object. Using Java Reflection you can access the annotations attached to Java classes at runtime. Related examples in the same category 15.
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