How to determine whether a string consists of characters in java

Judgment ideas:

First define a regular expression for judgment, for example: "^[a-zA-Z]* ", and then call the "matches" method to match the string that needs to be judged with the defined regular expression.

Free video tutorial recommendation: java learning

Judge whether all English characters:

public boolean isString(String s) {
return s.matches("^[a-zA-Z]*");
}

Extension:

Determine whether they are all numbers:

public boolean isNumber(String s) {
Pattern pattern = Pattern.compile("^[0-9]*");
return pattern.matcher(s).matches();
}

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