5/29/2023 0 Comments Java reflection apipublic Constructor getDeclaredConstructors()throws SecurityException returns the total number of constructors of this class. public Method getDeclaredMethods()throws SecurityException returns the total number of methods of this class. public Field getDeclaredFields()throws SecurityException returns the total number of fields of this class. public Class getSuperclass() returns the superclass class reference. public boolean isPrimitive() checks if it is primitive. public boolean isArray() checks if it is array. public boolean isInterface() checks if it is interface. public Object newInstance()throws InstantiationException,IllegalAccessException creates new instance. Java Class Methods Method Description public String getName() returns the class name public static Class forName(String className)throws ClassNotFoundException loads the class and returns the reference of Class class. To perform reflection operation, we must use that has public constructors for creating object.Ĭlass objects are constructed automatically by the Java Virtual Machine as classes are loaded and by calls to the defineClass method in the class loader. Java provides a class Class that contains methods to get the metadata of a class and manipulate the run time behavior of a class. Violation of Oops concept Java Class class.Loading drivers and providing dynamic information Disadvantages of Reflection.Some Important Classes of packageĬlass What it does ? Array allow you to dynamically create and manipulate arrays Constructor gives information about constructor of a class Field provide information about field Method provide information about method Modifier provide information about class and member access modifier Proxy supports dynamic proxy classesĪpart from these classes is another very important class used in Reflection API. These classes and interface define methods which are used for reflection. package encapsulates several important interfaces and classes. One of the advantage of reflection API is, we can manipulate private members of the class too. The java.lang and packages provide many classes for reflection and get metadata of a particular class. The class provides methods that are used to get metadata and manipulate the run time behavior of a class. In Java, Reflection API provides facility to analyze and change runtime behavior of a class at runtime.įor example, using reflection at the runtime you can determine what method, field, constructor or modifers a class supports. Reflection means ability of a software to analyze itself. Connecting to Access using Type-1 Driver.Method Overriding with Exception Handling.Difference between Classes And Interface.
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