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

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());
    }
}