Afficher les Types des Données utilisés en java

public class AffichageTypeDonnee {
    public static void main(String[] args) {
 
        Thread unObject = new Thread();
        String unString = "Exemple d'un String";
        char[] unTableauChar = { 'a', 'b', 'c' };
        int unInteger = 4;
        long unLong = Long.MIN_VALUE;
        float unFloat = Float.MAX_VALUE;
        double unDoucbe = Math.PI;
        boolean unBooleen = true;
 
        System.out.println(unObjet);
        System.out.println(unString);
        System.out.println(unTableauChar);
        System.out.println(unInteger);
        System.out.println(unLong);
        System.out.println(unFloat);
        System.out.println(unDouble);
        System.out.println(unBooleen);
    }
}