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• Java reflection set field how to#

Field modifiers: isSynthetic, isEnumConstant: 9. NullPointerException − if the specified object is null and the field is an instance field.ĮxceptionInInitializerError − if the initialization provoked by this method fails. The get() and set() method are used to get and set public field value in java. 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. For purposes of describing or accessing an object, these three. The value of the represented field in object obj primitive values are wrapped in an appropriate object before being returned. The three primary features of a class are its fields (variables), methods, and constructors. Obj − object from which the represented field's value is to be extracted. Throws IllegalArgumentException, IllegalAccessException

Java reflection set field how to#

In this tutorial, we'll learn how to use ReflectionTestUtils in unit. It's a collection for reflection-based utility methods used in a unit, and integration testing scenarios to set the non-public fields, invoke non-public methods, and inject dependencies. We use two methods for this purpose as described below before moving ahead as follows: getDeclaredMethod () invoke () Method 1: getDeclaredMethod (): It creates an object of the method to be invoked. Declarationįollowing is the declaration for .get(Object obj) method. ReflectionTestUtils is a part of the Spring Test Context framework. We can invoke a method through reflection if we know its name and parameter types.

The .get(Object obj) method returns the value of the field represented by this Field, on the specified object. For example, to get a protected field value that is known to be an int: int theIntValue (int)ReflectionTestUtils.