Retain precision with double in Java

Question

public class doublePrecision {
    public static void main(String[] args) {

        double total = 0;
        total += 5.6;
        total += 5.8;
        System.out         


        

Answer 1

        /*
        0.8                     1.2
        0.7                     1.3
        0.7000000000000002      2.3
        0.7999999999999998      4.2
        */
        double adjust = fToInt + 1.0 - orgV;
        
        // The following two lines works for me. 
        String s = String.format("%.2f", adjust);
        double val = Double.parseDouble(s);

        System.out.println(val); // output: 0.8, 0.7, 0.7, 0.8