want to add two string elemants, how could i do that?

You can use the function Integer.parseInt(String) which will parse the string argument as a signed decimal integer.:

void calc() {
    System.out.println(Integer.parseInt(line1) + Integer.parseInt(line2));

Note: This will throw an exception if one of the strings cannot be converted into an integer. You can handle this exception by using a try-catch block:

try {
    // operations
} catch (NumberFormatException e) {

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