CODEWITHSUNDEEP
javagwtnumber-formatting
willygroup
willygroup

Reputation: 323

[GWT][Java] Scientific notation auto rounded?

I need to use Scientific notation to represent a value. I use this code but the value is rounded and I don't want that...

import com.google.gwt.i18n.client.NumberFormat;
...
Double value = Double.parseDouble("0.00000012");
String formatted = NumberFormat.getScientificFormat().format(value);
System.out.println(formatted);

The result is:

1E-7

and not

1.2E-7

Could you help me? Thanks :)

Upvotes: 0

Views: 156

Answers (3)

nullPointer
nullPointer

Reputation: 4574

You can achieve what you want with the standard java.text.DecimalFormat

import java.text.DecimalFormat;
...

Double value = Double.parseDouble("0.00000012");
DecimalFormat formatter = new DecimalFormat("0.#####E0");
String formatted = formatter.format(value);
System.out.println(formatted);

This prints out : 1.2E-7

Upvotes: 0

nullPointer
nullPointer

Reputation: 4574

With your GWT NumberFormat, can you try the below and see if it works ? (eg using BigDecimal instead of Double)

System.out.println(NumberFormat.getScientificFormat().format(new BigDecimal("0.00000012")));

Upvotes: 0

Colin Alworth
Colin Alworth

Reputation: 18346

The same format pattern used in funkyjelly's answer should work with GWT's NumberFormat type:

import com.google.gwt.i18n.client.NumberFormat;
...
Double value = Double.parseDouble("0.00000012");
String formatted = NumberFormat.getFormat("0.#####E0").format(value);
System.out.println(formatted);

Upvotes: 2

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