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Generics Only with Objects When declaring an instance of a generic type, the type argument passed to the type parameter must be a class type. You cannot use a primitive type, such as int or char. For example, with GenClass, it is possible to pass any class type to T, but you cannot pass a primitive … Read more…
Generics Safety Java has always given you the ability to create generalized classes, interfaces, and methods by operating through references of type Object. Because Object is the superclass of all other classes, an Object reference can refer to any type object. Thus, in pre-generics code, generalized classes, interfaces, and methods used Object references to operate … Read more…
Generics The generics means parameterized types. Parameterized types enable you to create classes, interfaces, and methods in which the type of data upon which they operate is specified as a parameter. Using generics, it is possible to create a single class, that automatically works with different types of data. A class, interface, or method that … Read more…
Example of Protected Access When the protected access control modifier is specified for a variable or method in a class, it can be accessed by the methods of the same class, subclasses in the same package and non-subclasses in the same package. Furthermore, protected variables and methods can be accessed by all methods of subclasses … Read more…
Example of Package Access If we do not specify an access control modifier, then the default is package access. If a variable or method or class has package access, then it can be accessed by all methods of classes in the same package. The package access is a good default option for classes, but this … Read more…
Access Modifiers We can define the scope of a variable or method or class by using the access modifiers. The scope of an entity is the region in which it is accessible. Java has the following four levels of controlling access to variables, methods and classes. 1. Private Access Variables are generally declared with the … Read more…