Java Tutorial: Generics in java | Java Generics [Generics example using ArrayList] ~ foundjava

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GenericDemo.java

import java.util.ArrayList;
import java.util.Iterator;
/*
 * Example of Generics in Java
 * 
 * Here, we are using the ArrayList class, but you can use any collection
 * class such as ArrayList, LinkedList, HashSet, TreeSet, HashMap,
 * Comparator etc.
 */

public class GenericDemo
{
    public static void main(String[] args)
    {
        ArrayList<String> arrayList = new ArrayList<String>();
        arrayList.add("Peter");
        arrayList.add("Ram");
        arrayList.add("Juli");
        //arrayList.add(32);//compile time error

        System.out.println(arrayList);
        /*
         * type casting is not required
         */
        String stringValue = arrayList.get(0);
        System.out.println("stringValue = " + stringValue + "\n");

        Iterator<String> itr = arrayList.iterator();
        while (itr.hasNext())
        {
            System.out.println(itr.next());
        }
    }
}

Output

[Peter, Ram, Juli]
stringValue = Peter

Peter
Ram
Juli

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