JAVA

check if string has a valid number java

private boolean isInt(String s){
        try{
            Integer.parseInt(s);
            return true;
        }catch (NumberFormatException e){
            return false;
        }
    }

java is number

String someString = "123123";
boolean isNumeric = someString.chars().allMatch( Character::isDigit );

java how to check string is number

public static boolean isNumeric(String strNum) {
    if (strNum == null) {
        return false;
    }
    try {
        double d = Double.parseDouble(strNum);
    } catch (NumberFormatException nfe) {
        return false;
    }
    return true;
}