JAVA EE: Java Tutorial: Generics in java | Java Generics [How to define a Generic method

Tuesday 16 May 2017

Java Tutorial: Generics in java | Java Generics [How to define a Generic method - addAndReturn]

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Java Tutorial: Generics in java | Java Generics [How to define a Generic method - addAndReturn]

GenericDemo.java

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

public class GenericDemo
{
    public static void main(String[] args)
            throws IllegalAccessException, InstantiationException
    {

        String stringElement = "Peter";
        List<String> stringList = new ArrayList<String>();

        String strReturnElement = addAndReturn(stringElement, stringList);
        System.out.println(strReturnElement);

        Integer integerElement = new Integer(500);
        List<Integer> integerList = new ArrayList<Integer>();

        Integer integerReturnElement = addAndReturn(integerElement,
                                                        integerList);
        System.out.println(integerReturnElement);

    }

    public static <T> T addAndReturn(T element, Collection<T> collection)
    {
        collection.add(element);
        return element;
    }

}