Question

I’m developing an ‘Automatic test case generator’ using java. The inputs for the java program will be fed by prolog program. If the input is for example an integer 2 then the java program should square the number and display it as output. In the same way if there are 3 integers the java program should accept one number at a time and display all results (i mean it should test each case).

Answer 1

As I said in a comment, all inputs are Strings The program has to convert the strings into different object types to “test each case”, such as in the following program.

import java.util.*;

public class CaseTester {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in).useDelimiter(" "); //separate entries with a space
        String input;
        while (sc.hasNext()) {
            input = sc.next();
            try {
                double num = Double.parseDouble(input);
                System.out.println("" + Math.pow(num, 2));
            } catch (NumberFormatException e) {
                //input was not a number so move to the next "test"
            }
            try {
                URL test = new URL(input);
                System.out.println("Valid URL");
            } catch (MalformedURLException e) {
                //input was not a valid URL so move to the next "test"
            }
            //put more tests here if you want
        }
        sc.close();
    }
}

Just in case you’re confused, you don’t always have to conduct tests with a try block. You can use if and switch blocks as well (i.e. if (input.equalsIgnoreCase("dog")) //do something)