The first argument is the object instance on which this particular. The class has methods for reading information about the method (name, modifiers, parameter types, return type, and thrown exception types) and invoking the method for a given object. ( ) includes supporting methods for the dynamic language features (e.g. The Method class represents a reflected static or an instance method. Typically, this would only be necessary if it is not possible to cast an instance of the class to the desired type in non-reflective code. invoke API is the dynamic equivalent of the method invocation in Java. As in this case, our method is static, and the target object is the parent class LongArrayUtil. The first argument to invoke is the target object, and the remaining arguments need to match our methods signature. First argument to the invoke method is the object instance on which this particular method is to be invoked i.e. We have now successfully accessed a private method. Once you have a Method instance using any of the above mentioned methods, you can invoke method of the class by calling .invoke ().
File Name : com/bethecoder/tutorials/reflection/InvokeMethod.
#Java reflection invoke static method how to#
This means that the JVM enforces access control checks when invoking them.įor instance, if we try to call a private method outside its defining class or a protected method from outside a subclass or its class' package, we'll get an IllegalAccessException: = IllegalAccessException. Reflection provides a means for invoking methods on a class. How to invoke method using Java reflection API. The following example shows how to invoke static and instance methods using java reflection API. Parameters: cls - invoke static method on this. By default, not all reflected methods are accessible. This uses reflection to invoke the method obtained from a call to getAccessibleMethod(Class, String, Class).
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