Monday, 15 May 2017

Java Tutorial: Generics in java | Java Generics [How to define a Generics class]


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Java Tutorial: Generics in java | Java Generics [How to define a Generics class] 
MyGeneric.java
class MyGeneric<T>
{
    T obj;

    void add(T obj)
    {
        this.obj = obj;
    }

    T get()
    {
        return obj;
    }
}
GenericDemo.java
/*
 * Code to use the generic class.
 */
public class GenericDemo
{
    public static void main(String[] args)
    {
        useInteger();  
        useString();
    }

    private static void useInteger()
    {
        MyGeneric<Integer> myGeneric=new MyGeneric<Integer>();  
        myGeneric.add(2);  
        //myGeneric.add("peter");//Compile time error  
        System.out.println(myGeneric.get());
    }
    
    private static void useString()
    {
        MyGeneric<String> myGeneric=new MyGeneric<String>();  
        myGeneric.add("Ram");  
        System.out.println(myGeneric.get());
    }
}
Output
2
Ram
Click the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/GenericsDemo_GenericClass_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/GenericsDemo_GenericClass_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/47d09ebb24294f7b507419345f38ec4cde27d544/BasicJava/GenericsDemo_GenericClass_App/?at=master

See also:
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  • JDBC Tutorial
  • Java Collection Framework Tutorial
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