格式化数字值从 XX.X 到 .XXX java

Question

I am receiving a value from a server that reads as a percentage, for example 77.5%. How can get the value .775 just using:

String.format(Locale.getDefault(), formatPattern, floatValue);

I've consulted https://docs.oracle.com/javase/tutorial/java/data/numberformat.html , but it doesn't seem to cover my situation.

Note: I can only use the string format as we are placing the pattern into a config file.

Answer 1

我们可以避免除以 100，只需使用以下方法将浮点移动到左两个位置：

double value = java.math.BigDecimal.valueOf(77.5).movePointLeft(2).doubleValue();

Answer 2

Try this:

String value = "75%";
Double aNumber = (Double.parseDouble(value.replace("%", "")))/100;

Answer 3

Does this work for you:

String num = "75.5%";
String res = new DecimalFormat("#.000").format(Double.parseDouble(num.substring(0, num.length()-1))/100);