How to have access to the value of an attribut using a value of a string as an index-CodePudding

Hello guys so basically i got a class with attributs : let's take an exemple

public class A {
     private String A;
     private String B;
     private String C;
}

then i used this trick to get the names of the attributs :

Class A obj= new A("hello","hey","bye");
Class c = obj.getClass();
Field[] fields = c.getDeclaredFields();
for(int i = 0; i < fields.length; i  ) 
        System.out.println(fields[i].getName());

now the output is going to be :

A
B
C

now i want to try to have access to the values of the attribut using the values of string so my code becomes something like this

    for(int i = 0; i < fields.length; i  ) 
        System.out.println(obj.fields[i].getName());

and output will become

hello
hey
bye

any guide how to do it ? if it doesn't exist any idea how to access to the values?

CodePudding user response：

Use field.get(obj). If the field is private you need to make it accessibile with field.setAccessible(true).

A obj= new A("hello","hey","bye");
Class c = obj.getClass();
Field[] fields = c.getDeclaredFields();
for (Field f : fields) {
    System.out.println(f.getName());
    f.setAccessible(true);
    System.out.println(f.get(obj));
}