Cheese Cheese - 3 months ago 54
Java Question

Java scanner check if string or int

I have a scanner running where the user can input either strings or integers.
There are only specific characters the user can enter such as a,e,u,r and the number can be anything. The check runs if its a letter but fails if the user enters a number.

String temp =;
String[] validToken = {"x","e","u","r","+","-","/","*",};
for (String validToken1 : validToken) {
if (temp.equals(validToken1) || temp.equals("\\d+")) {
tokenCheck = true;


Change equals to matches. matches is used to check whether or not string matches a particular regular expression.

if (temp.equals(validToken1) || temp.matches("\\d+")) {
                     tokenCheck = true;