java: default number-formatting

I have a program that does algorithmic calculations with some number-output. I want this output to look nice and the program still being fast. I used the DecumalFormat but this makes it so slow, but works. Is there a way to set the default n开发者_运维知识库umber output so I wouldnt need DecimalFormat???

Locale deLocale = new Locale("de_DE");
// should be format:  ###,###.###    123.456,789     de_DE

Locale.setDefault (deLocale);

double f=-123456.123458998;
System.out.println (""+f+"");  // I wourld expect -123.456,123
// but the output is -123456.123458998

any ideas?? thanks! chris

You need to look at the Customizing Format.

You need a ###,###.### - de_DE pattern.

String pattern= "###,###.###";
DecimalFormat myFormatter = new DecimalFormat(pattern);
double f=-123456.123458998;
String output = myFormatter.format(f);
System.out.println(f+ " " + pattern + " " + output);

EDIT : Use Predefined format, in case you don't want your own pattern.