将双精度展开为Java中的字符串

Question

In Java, for storing large numbers(10^80 to 10^100), we will be using Double . But Double will return in ae^x format where x is exponent value.Is there any way to unwrap it to a string.
Eg: Double d = 1000000000;

 Double.toString(d); --> output: 1.0E9.

Instead I want it as 1000000000

Answer 1

Use a DecimalFormat :

double d = 1000000000;
DecimalFormat df = new DecimalFormat("#");
System.out.println(df.format(d));

From the Javadocs:

 Integer: MinimumInteger # # Integer # , Integer