public class MapTest { public static void main(String［］ args) { HashMap<String, String> map = new HashMap<>(); map.put("zhao", "100"); map.put("qian", "85"); map.put("sun", "30"); map.put("li", "99"); System.out.println("size:"+map.size()); System.out.println("zhao:"+map.containsKey("zhao")); System.out.println("zhao:"+map.get("zhao")); } } 结果为： size:4 zhao:true zhao:100 程序运行的结果是 size= ( )。