double f1 = 4.56e3;
double f2 = 4.56E3;
double f3 = 5.5667e90;
double f4 = 6.777e-8;
System.out.println(f1 + " " + String.format("%f", f1));
System.out.println(f2 + " " + String.format("%f", f2));
System.out.println(f3 + " " + String.format("%f", f3));
System.out.println(f4 + " " + String.format("%f", f4));
4560.0 4560,000000
4560.0 4560,000000
5.5667E90 5566700000000000000000000000000000000000000000000000000000000000000000000000000000000000000,000000
6.777E-8 0,000000