If you have a String which contains text that can be interpreted as an integer you can convert it to an int using the parseInt static method on Integer.¹

~void main() {
String text = "123";

int oneTwoThree = Integer.parseInt(text);

IO.println(oneTwoThree);
~}

If what is in the String cannot be converted to an int that method will throw a NumberFormatException.

~void main() {
String word = "music";

int value = Integer.parseInt(word);
~}

If you want to handle input from a user that might not be interpretable as an integer, you can use try/catch alongside delayed assignment.

~void main() {
String word = "seltzer";

int value;
try {
    value = Integer.parseInt(word);
} catch (NumberFormatException e) {
    value = 8; // Default value
}
~}