GetNumber.java Source code

Introduction

Here is the source code for GetNumber.java

Source

import java.awt.*;
import java.awt.event.*;

public class GetNumber {
    private static Number NAN = new Double(Double.NaN);

    /* Process one String, returning it as a Number subclass
     * Does not require the GUI.
     */
    public static Number process(String s) {
        if (s.matches(".*[.dDeEfF]")) {
            try {
                double dValue = Double.parseDouble(s);
                System.out.println("It's a double: " + dValue);
                return new Double(dValue);
            } catch (NumberFormatException e) {
                System.out.println("Invalid a double: " + s);
                return NAN;
            }
        } else // did not contain . d e or f, so try as int.
            try {
                int iValue = Integer.parseInt(s);
                System.out.println("It's an int: " + iValue);
                return new Integer(iValue);
            } catch (NumberFormatException e2) {
                System.out.println("Not a number:" + s);
                return NAN;
            }
    }

    public static void main(String[] ap) {
        process("0");
        process("1111111111");
    }
}