The below code passed the test when run in Java 7 but not in Java 15 environment. Why? I cannot understand the reason? Is this just a bug?

public class Solution { public static void main(String[] args) { Class student = Student.class;

    Method[] methods = student.getDeclaredMethods(); 

    ArrayList<String> methodList = new ArrayList<>();
    for (Method method : methods) {
        methodList.add(method.getName()); 
    }

    Collections.sort(methodList); 
    for (String name : methodList) {
        System.out.println(name); 
    }
}

}

Keeps happening, arrived to the correct answer in java8 but since it kept saying wrong answer, i had to look for this to find out only java 7 works...

Please add fixing this to the to do list

Beware, only Java 7 works for this

i am using java 15 and it keeps saying cannot find symbol for Student

in Java 8 not work... look the output... its a shame a plataform like that keep this error so long