java报错:java.util.HashMap$Values cannot be cast to java.util.ArrayList
2022-03-01
代码:
HashMap<String, String> map = new HashMap<>();
map.put("name", "zhangsan");
map.put("age", "12");
ArrayList<String> values = (ArrayList<String>)map.values();//使用强制类型转换
System.out.println(values);
报错:
java.util.HashMap$Values cannot be cast to java.util.ArrayList
修复:
HashMap<String, String> map = new HashMap<>();
map.put("name", "zhangsan");
map.put("age", "12");
ArrayList<String> values = new ArrayList<>(map.values());//使用ArrayList的构造方法
System.out.println(values);
参考:
https://www.cnblogs.com/hqbhonker/p/5196359.html