Double precision example

package com.company;

public class Main {

    public static void main(String[] args) {
        double f1 = .0;
        for (int i = 1; i <= 11; i++) {
            f1 += 0.1;
        }

        System.out.println(f1);
        String numFormatted = String.format("%.2f", f1);
        System.out.println(numFormatted);
        f1 = Double.parseDouble(numFormatted);
        System.out.println(f1);
    }
}