Java scanner check if string or int

Question

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

Using a Set instead of a String[] will enable you to do this: validToken.contains(temp) and like @iNam said, if you want to check a String agains a regex use matches(....) — Titus
– Titus, Commented Nov 25, 2016 at 17:39

Raghav · Accepted Answer · 2016-11-25 17:34:06Z

2

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;
                }

answered Nov 25, 2016 at 17:34

Raghav

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Cr4xy · Accepted Answer · 2016-11-25 17:33:17Z

2

It should be fixed when you replace equals with matches, because with equals you are checking if the string is literally \d+, it's not regex.

answered Nov 25, 2016 at 17:33

Cr4xy

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