Java Generics Example

GenericExample.java

package java_examples;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

public class GenericExample {

	/**
	 * 
	 * @param args
	 */
	public static void main(String[] args){
		List<Integer> aLst = new ArrayList<>();
		aLst.add(1);
		aLst.add(2);

	/* Now invoke the genericMethod with an ArrayList of Integers as an argument*/
        List<Integer> aList = genericMethod(aLst);        
        aList.forEach(elem -> System.out.println(elem));        
        aList.forEach(System.out::println);
        
        List<String> bLst = new ArrayList<>();
        bLst.add("a");
        bLst.add("s");
        
        /* Now invoke the genericMethod with an ArrayList of Strings as an argument*/
        List<String> bList = genericMethod(bLst);       
        bList.forEach(elem -> System.out.println(elem));        
        bList.forEach(System.out::println);
	}
		
	/**
	 * 
	 * @param list
	 * @return List
	 */
	public static <T> List<T> genericMethod(List<T> list) {
	    return list.stream().collect(Collectors.toList());
	}
}