Java Generics

This topic is about Java Generics - No Overload. A class is not allowed to have two overloaded methods that can have the same signature after type erasure. class Box…

This topic is about Java Generics - No Exception. A generic class is not allowed to extend the Throwable class directly or indirectly. //The generic class Box<T> may not subclass…

This topic is about Java Generics - No Array. Arrays of parameterized types are not allowed. //Cannot create a generic array of Box<Integer> Box<Integer>[] arrayOfLists = new Box<Integer>[2]; Because compiler…

This topic is about Java Generics - No instanceOf. Because compiler uses type erasure, the runtime does not keep track of type parameters, so at runtime difference between Box<Integer> and…

This topic is about Java Generics - No Static field. Using generics, type parameters are not allowed to be static. As static variable is shared among object so compiler can…

This topic is about Java Generics - No Cast. Casting to a parameterized type is not allowed unless it is parameterized by unbounded wildcards. Box<Integer> integerBox = new Box<Integer>(); Box<Number>…

This topic is about Java Generics - No Instance. A type parameter cannot be used to instantiate its object inside a method. public static <T> void add(Box<T> box) { //compiler…

This topic is about Java Generics - No Primitive Types. Using generics, primitive types can not be passed as type parameters. In the example given below, if we pass int…

This topic is about Java Generics - Generic Methods Erasure. Java Compiler replaces type parameters in generic type with Object if unbounded type parameters are used, and with type if…

This topic is about Java Generics - Unbounded Types Erasure. Java Compiler replaces type parameters in generic type with Object if unbounded type parameters are used. Example package com.Adglob; public…