Generic Arrays

Java-Generic Arrays

Generic Arrays It’s also possible to create generic arrays. There are two important generics restrictions that apply to arrays. First, you cannot instantiate an array whose element type is a type parameter. Second, you cannot create an array of type-specific generic references. Following program shows, it’s valid to declare a reference to an array of type T, … Read more…

Constructor Reference for Array

Java-Constructor Reference for Arrays

Constructor Reference for Arrays Another form of the constructor reference syntax that is used for arrays. To create a constructor reference for an array, use the construct : type[ ]::new. Type specifies the type of object being created. For example, the following creates a three-element array of MyClass objects and gives each element an initial … Read more…

Constructor References

Java-Constructor References

Constructor References It is also possible to create references to constructors. This is the general form of the syntax that you will use : className::new. This reference can be assigned to any functional interface reference that defines a method compatible with the constructor. For example, in the following program, the MyMethod( ) method of MyInterface returns a reference of … Read more…

Method References to Generics

Java-Method References to Generics

Method References to Generics You can use method references with generic classes and/or generic methods. For example, in the following program, MyClass is a non-generic class that contains a static generic method called showData( ). This method print the elements in an specified array. Notice how the generic type argument is specified. For example, its first call … Read more…

Variable Capture

Java-Variable Capture

Variable Capture A lambda expression can use an instance or static variable defined by its enclosing class. A lambda expression also has access to this keyword, which refers to the invoking instance of the lambda expression’s enclosing class. Thus, a lambda expression can obtain or set the value of an instance or static variable and call … Read more…

Instance Method References with Class Name

Java-Instance Method References with Class Name

Instance Method References with Class Name It is also possible to handle a situation in which you want to specify an instance method that can be used with any object of a given class, not just a specified object. In this case, you will create a method reference as ClassName::instanceMethodName. The name of the class is … Read more…