For example a phone number will be entered with (-) characters like;
650-212-5710.
A price value may be entered with (,) characters like;
12,500.00
In Java, java.lang.Character class has a method; isDigit() which can be used to identify whether a character is a digit or not. Following method can be used for extracting a numbers-only string.
public static String getOnlyNumerics(String str) {
if (str == null) {
return null;
}
StringBuffer strBuff = new StringBuffer();
char c;
for (int i = 0; i < str.length() ; i++) {
c = str.charAt(i);
if (Character.isDigit(c)) {
strBuff.append(c);
}
}
return strBuff.toString();
}
Calling above method with any String will return a numbers-only string.