test20.java

SCJP认证考试资料

import java.util.*;
public class Test20 {
    public static void main(String[] args) {
	Vector<String> aList = new Vector<String>();
	aList.add("USA");
	aList.add("Russia");
	aList.add("USA");
	aList.add("UK");
	List<? extends Object> i = aList;
	//Collections.sort(aList);
	for (Object s:i) {
	    System.out.print(s);
	}
    }
}