Something

/*
 * Main.java
 *
 * Created on February 18, 2007, 7:56 PM
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package calc;

import java.io.*;



/**
 *
 * @author kcbanner
 */
public class Main {
    
    /** Creates a new instance of Main */
    public Main() {
    }
    
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws IOException {
            
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        
        System.out.print("First Number: ");
        System.out.flush();
        String ain  = in.readLine();
        System.out.print("Operation: ");
        System.out.flush();
        String operin = in.readLine();
        System.out.print("Second Number: ");
        System.out.flush();
        String bin    = in.readLine();

        Double a = Double.valueOf(ain);
        Double b = Double.valueOf(bin);

        if (operin == "+") {  System.out.println(a + b); }
        else if (operin == "-") { System.out.println(a - b); }
        else if (operin == "*") { System.out.println(a * b); }
        else if (operin == "/") { System.out.println(a / b); }
        else { System.out.println("Invalid Operator: " + operin + "."); }    
        
    }                 
        
        
}