test18.java

SCJP认证考试资料

import java.util.*;
class Test18{
    public static void main(String[] args) {
	List<? extends object> aList = new Vector<String>();
	aList.add("USA");
	aList.add("Russia");
	aList.add("UK");
	for (Object s:aList) {
	    System.out.print(s);
	}

    }
}