test22.java

SCJP认证考试资料

import java.util.*;
public class Test22 {
    public static void main(String[] args) {
	List<?> I = new Vector<String>();
	Map<? extends Number,? extends Number> m1 =
	    new HashTable<Integer,Float>();
	Set<String> s = new LinkedHashSet<String>();
    }
}