Generics and Wildcard

java

Generics and Wildcard

Collection<dataType> variable = new Collection<dataType>();

import java.util.List; import java.util.ArrayList; public class dailyCode { public static void main(String[] args) { List<String> strList = new ArrayList<String>(); strList.add("aaa"); strList.add("bbb"); strList.add("ccc"); List<Integer> intList = new ArrayList<Integer>(); intList.add(111); intList.add(222); intList.add(333); printList(strList); printList(intList); } private static void printList(List<?> list) { for(Object obj : list) { System.out.println(obj); } System.out.println("---"); } }