将双数替换为字符串中的另一个

Question

If I have multiple strings in the following pattern:

String k = "Remain is 2.5"
String k1 = "Remain is 3.5"
String k2 = "Remain is 4.5"

How can I replace the double number with another?! It would be a list of strings so number is changed. Also, what's the case if the number's location is changed?!

Example:

String k = "Remain 2.5 pounds"

Any ideas?!

Answer 1

String.replace seems to fit the bill:

String k = "Remain is 2.5"
String k1 = k.replace("2.5", "3.5");
String k2 = k.replace("2.5", "4.5");

Answer 2

If you know that your number is always formatted as a sequence of digits followed by a dot followed by another sequence of digits, and that there is going to be exactly one such sequence per string, you could use replaceAll with regex:

String res = orig.replaceAll("\\d+[.]\\d+", replacementNumberString);

Demo.