How to get substring from string [duplicate]

Answer 1

For this use String.indexOf

Returns the index within this string of the first occurrence of the specified character. If a character with value ch occurs in the character sequence represented by this String object, then the index (in Unicode code units) of the first such occurrence is returned. For values of ch in the range from 0 to 0xFFFF (inclusive), this is the smallest value k such that:

Combined with with String.substring

Returns a new string that is a substring of this string. The substring begins at the specified beginIndex and extends to the character at index endIndex - 1. Thus the length of the substring is endIndex-beginIndex.

Result

s.substring(0, s.indexOf("."));

Answer 2

s.substring(0, s.indexOf("."));

Answer 3

String str = "150.23121KB";
String[] requiredString = str.split("\\.");
System.out.println(requiredString[0]);

Answer 4

result = result.split("\\.")[0];