Question

I want to write a java program to print all (public or private) parameters of a class and their types. I think I have to use reflection, but I’m noob at java reflection.

As an example, I need the my program to run on below class and result in following output:

class a{
    public int b;
    public int c;
    private String s;    
}

output:

b: int
c: int
s: St

Finally my question is how to get a list of parameters of a class and their types.

Answer 1

I would recommend you explore the javadoc, starting with the Class class:

Instances of the class Class represent classes and interfaces in a running Java application.

Of note is the method getDeclaredFields(), which returns an array of Field objects representing the fields the class declares.

Also take note of the ways to obtain a Class object:

Class<MyClass> c = MyClass.class; //statically

MyClass mc = new MyClass();
Class<? extends MyClass> c2 = mc.getClass(); //dynamically