test22.java

来自「SCJP认证考试资料」· Java 代码 · 共 10 行

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>();
    }
}