集合Map

Question

package ST;

import java.util.HashMap;
import java.util.Map;

import wang.Entity;

public class MapTest {
public static void main(String[] args) {
Entity entity=new Entity("王田", 20, "男");
Entity entity1=new Entity("王一", 20, "女");
Entity entity2=new Entity("王二", 20, "男");
Entity entity3=new Entity("王三", 20, "女");

    Map<String, Entity> Ma=new HashMap<String, Entity>();

    Ma.put("Java", entity);
    Ma.put("ha", entity1);
    Ma.put("yy", entity2);
    Ma.put("uu", entity3);

    for (String si:Ma()) {
            //这里报错？
        System.out.println("姓名"+Ma.get(si).getName()+"\t"+"年龄"+Ma.get(si).getAge()+"\t"+"性别"+Ma.get(si).getSex());

    }
}

}

Answer 1

object没有getName之类方法，应该先转成你的那个实体类型再get吧