Parse double on string giving wrong result

Question

In my project I am getting a string values from an api and need to pass double values to another api. When I try to parse from string values to double I am not getting the original data.

Here is the code.

String l1="11352721345377306";
String l2="11352721346734307";
String l3="11352721346734308";
String l4="11352721346734309";

DecimalFormat df = new DecimalFormat(".00");

System.out.println(df.format(Double.parseDouble(l1)));
System.out.println(df.format(Double.parseDouble(l2)));
System.out.println(df.format(Double.parseDouble(l3)));  
System.out.println(df.format(Double.parseDouble(l4)));

The output is

11352721345377306.00
11352721346734308.00
11352721346734308.00
11352721346734308.00

What went wrong? Is there any problem with parsing? How can i get the original values back.?

Edit : Without using Decimal Format:

1.1352721345377306E16
1.1352721346734308E16
1.1352721346734308E16
1.1352721346734308E16

Answer 1

You can't get original values back. Refer this Java's Floating-Point (Im)Precision .

Answer 2

double只有15/16位数的精度，当你给它一个它无法表示的数字时，它需要最接近的可表示数字。

Answer 3

What is the problem ? ".00" ? If you don't need this, why using a Double ?

You can try like this...

    String l1="11352721345377306";
    String l2="11352721346734307";
    String l3="11352721346734308";
    String l4="11352721346734309";

    Double d1 = Double.parseDouble(l1);
    Double d2 = Double.parseDouble(l2);
    Double d3 = Double.parseDouble(l3);  
    Double d4 = Double.parseDouble(l4);

    System.out.println(d1.longValue());
    System.out.println(d2.longValue());
    System.out.println(d3.longValue());  
    System.out.println(d4.longValue());

Edit, with BigDecimal to get the correct values:

    String l1="11352721345377306";
    String l2="11352721346734307";
    String l3="11352721346734308";
    String l4="11352721346734309";

    BigDecimal bd1 = new BigDecimal(l1);
    BigDecimal bd2 = new BigDecimal(l2);
    BigDecimal bd3 = new BigDecimal(l3);
    BigDecimal bd4 = new BigDecimal(l4);

    System.out.println(bd1);
    System.out.println(bd2);
    System.out.println(bd3);  
    System.out.println(bd4);

Output is:

11352721345377306
11352721346734307
11352721346734308
11352721346734309

Answer 4

You can use

double d = Math.round(Double.parse(yourString) * 100.0) / 100.0;

to get double with rounded decimals.

For printing use:

String formatted = String.format("%.2f", yourDouble);