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javadoubledecimalformat
Mohsin AR
Mohsin AR

Reputation: 3108

convert double values in decimal (fraction) values java

I have below code:

Double a = new Double((123456798/1000000)); //123456798 this value comes from client side as a `int`
DecimalFormat df = new DecimalFormat("###.###");            
log.info("a :"+a+" df "+df.format(a.doubleValue()));

output:

a :123.0 df 123
//i want output like this, a :123.xxx fd 123.xxx

please help

UPDATE:

123456798 this value comes from client side as a int so i cant do it as 123456798.0 (or something)

Upvotes: 1

Views: 811

Answers (5)

Ninad Pingale
Ninad Pingale

Reputation: 7069

Any one value in the division should be float or double.

Double a = new Double((123456798.0/1000000));

or

Double a = new Double((123456798/1000000.0));

if you are getting these values in variables, then multiply it with 1.0

like

Double a = new Double((variable*1.0/1000000));

Upvotes: 2

Mureinik
Mureinik

Reputation: 310993

123456798 and 1000000 are int literals, so dividing them will use integer arithmetic, and yield 123. Instead, you could use floating point literals in order to use floating point arithmetic:

Double a = new Double((123456798.0/1000000.0));
DecimalFormat df = new DecimalFormat("###.###");            
log.info("a :"+a+" df "+df.format(a.doubleValue()));

Upvotes: 3

Jesper
Jesper

Reputation: 206776

Double a = new Double((123456798/1000000));

You are doing integer division here. Make one of the constants a double, so that floating-point division is done. Also, why are you using Double? It's better to use the primitive type double.

double a = 123456798.0 / 1000000;

Or simply, since they are constants:

double a = 123.456789;

Upvotes: 1

Dmitrii Bychenko
Dmitrii Bychenko

Reputation: 186668

Put it like that

Double a = new Double((123456798.0/1000000.0)); // <- note ".0"

the reason of the misbehavior is the integer division:

  123456798/1000000

is the integer value, while 

  123456798.0/1000000.0

is the floating point one (double)

Upvotes: 1

Smutje
Smutje

Reputation: 18123

You perform an integer division, thats why a is incorrect:

Double a = new Double(123456798.0/1000000);

Upvotes: 0

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