如何对Java中的字符串执行算术运算？

Question

sorry for asking this simple question but i tried many ways still i am struggling to find solution. i have a 2 string variable and i need to make addition operation for those string variable.

I tried The following Code:

String first="01.25";
String second="00.35";
Float f1=Float.parseFloat(first);
Float f2=Float.parseFloat(second);
Float f3=f1+f2;
System.out.println("value"+f3);

For Example:

String first="01.25"; String second="00.35";

Required answer is 01.60

How can i achieve can any one help to fix this???

Thanks in advance

Answer 1

Use following code:

String first="01.25";
String second="00.35";
Float f1=Float.parseFloat(first);
Float f2=Float.parseFloat(second);
Float f3=f1+f2;
String result=new DecimalFormat("00.00").format(f3);
System.out.println("value"+result);

Output :

value01.60

All you need is a DecimalFormat to format your result to required pattern. For more on DecimalFormat visit this link.

Answer 2

Use a DecimalFormat object to format your number:

DecimalFormat numberFormat = new DecimalFormat();
numberFormat.setMinimumIntegerDigits(2);
numberFormat.setMinimumFractionDigits(2);
System.out.println(numberFormat.format(f3));

Or initialize the instance with a pattern.

DecimalFormat numberFormat = new DecimalFormat("00.00");