Main.java Source code

Introduction

Here is the source code for Main.java

Source

public class Main {

    public static void main(String[] args) {
        System.out.println(testNumber("2.2"));
    }

    public static Float testNumber(String aArg) {
        while (true) {
            if (aArg.length() == 0) {
                return null;
            }
            if (aArg.matches("-?\\d+(\\.\\d+)?") == true) {
                break;
            } else {
                throw new IllegalArgumentException("not a number");
            }
        }
        return Float.parseFloat(aArg);
    }
}