#bounded type parameter

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Bounded Type Parameter in Java Generics

Bounded Type Parameter in Java Generics

In Java Generics, a situation can arise where we need to restrict or bound an object type to specific types only in order to narrow down the acceptable types supported in the type parameter. For instance, a method that deals with numbers, should accept Number and its sub-classes. Bounded Types: The concept of limiting type parameter upto certain type is known as bounded types. In this, extends…

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What is Generics in Java with Example ?

What is Generics in Java with Example ?

Generic programming is a way of creating classes, interfaces, and methods to work with various data types. It provides the flexibility to write a feature that is independent of the specific datatypes. In simple words, it allows us to create a class, interface, or method that accepts various datatypes automatically in the parameterized way. Therefore, Generics concept is also termed as…

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Learn Java Programming - Generics: Bounded Type Parameters Tutorial

In this tutorial I will introduce you to bounded type parameters. I will expand on my example Box class by turning it into a generic class that will take values from various types of classes that are subclasses of the Number class. Classes such as Integer, Float, Double, etc. will all be valid parameter types for this new and improved version. Bounded type parameters limit the valid type parameters to only types that are an instance of the bounded type. The Java keywords extends is used to specify the bounded type. For example, class Box<T extends Number> { ... } In the example above, the Number class is the bounded type specified after the extends keyword. The T is the type-variable. The T type-variable must be a subclass of Number somewhere down the hierarchy or else a compiler error will occur. Angle brackets are also known as chevrons or diamond syntax.