CODEWITHSUNDEEP
javanumbersformatdecimal
Fred
Fred

Reputation: 71

Java - Format number to print decimal portion only

Is there a simple way in Java to format a decimal, float, double, etc to ONLY print the decimal portion of the number? I do not need the integer portion, even/especially if it is zero! I am currently using the String.indexOf(".") method combined with the String.substring() method to pick off the portion of the number on the right side of the decimal. Is there a cleaner way to do this? Couldn't find anything in the DecimalFormat class or the printf method. Both always return a zero before the decimal place.

Upvotes: 7

Views: 10731

Answers (3)

noor mahir
noor mahir

Reputation: 1

This will print 0.3

double x = 23.8;
int y =(int)x;
float z= (float) (x % y);
System.out.println(z);

Upvotes: 0

CodeClimber
CodeClimber

Reputation: 4664

Divide by 1 and get remainder to get decimal portion (using "%"). Use DecimalFormat to format result (using "#" symbol to suppress leading 0s):

double d1 = 67.22;
double d2 = d1%1;
DecimalFormat df = new DecimalFormat("#.00");
System.out.println(df.format(d2));

this prints .22

Upvotes: 5

jberg
jberg

Reputation: 4818

You can remove the integer part of the value by casting the double to a long. You can then subtract this from the original value to be left with only the fractional value:

double val = 3.5;
long intPartVal= (long) val;
double fracPartVal = val - intPartVal;
System.out.println(fracPartVal);

And if you want to get rid of the leading zero you can do this:

System.out.println(("" + fracPartVal).substring(1));

Upvotes: 7

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