Question

Assume that x is a char variable that has been declared and already given a value. Write an expression whose value is true if and only if x is alphanumeric, that is either a letter or a decimal digit.

Answer 1

In Java, the character class has both an isDigit method and an isLetter method.

if (Character.isDigit(a) || Character.isLetter(a)){
return true;
} else {return fase;}