Generics in Java

Guided by Bipin Ajay
Founder of Tech Jitendra .

Generics in Java is similar to templates in C++. The idea is to allow type (Integer, String, … etc and user defined types) to be a parameter to methods, classes and interfaces. For example, classes like HashSet, ArrayList, HashMap, etc use generics very well. We can use them for any type.Generic Class
Like C++, we use <> to specify parameter types in generic class creation. To create objects of generic class, we use following syntax.

// To create an instance of generic class BaseType <Type> obj = new BaseType <Type>() Note: In Parameter type we can not use primitives like ‘int’,’char’ or ‘double’.// A Simple Java program to show working of user defined // Generic classes // We use < > to specify Parameter type classTest<T> { // An object of type T is declared T obj; Test(T obj) {  this.obj = obj;  }  // constructor publicT getObject()  { returnthis.obj; } } // Driver class to test above classMain { publicstaticvoidmain (String[] args) { // instance of Integer type Test <Integer> iObj = newTest<Integer>(15); System.out.println(iObj.getObject()); // instance of String type Test <String> sObj = newTest<String>("GeeksForGeeks"); System.out.println(sObj.getObject()); } }output 15 Geek for Geek

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