CODEWITHSUNDEEP
javareflection
Saeed
Saeed

Reputation: 7370

How to find all parameteres of a class and their type?

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.

Upvotes: 0

Views: 90

Answers (2)

Paul Bellora
Paul Bellora

Reputation: 55213

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

Upvotes: 6

Petar Ivanov
Petar Ivanov

Reputation: 93030

try {
    Class c = Class.forName("a");

    Field[] fs = c.getDeclaredFields();

    for(Field f : fs){
        System.out.println(f.getName()+": "+f.getType().getSimpleName());
    }

} catch (ClassNotFoundException e) {}

Upvotes: 3

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