问格式浮点数以显示小数位(如果不是零java )

EN

// This is to show symbol . instead of ,
DecimalFormatSymbols otherSymbols = new DecimalFormatSymbols(Locale.US);
// Define the maximum number of decimals (number of symbols #)
DecimalFormat df = new DecimalFormat("#.##########", otherSymbols);

// type: double
System.out.println(df.format(5.0)); // writes 5
System.out.println(df.format(7.3)); // writes 7.3
System.out.println(df.format(9.000003)); // writes 9.000003

// type: float
System.out.println(df.format(9.000003f)); // writes 9.000002861