SW409 Homework

Find a way to use the serial port extensions to dial the phone. Examples are already embedded into the code. However, a new interface would be really nice. For example: You can use real touch tones and oscillator to do speaker dialing Use the following static, synchronized methods: Dial.speaker("203,,555-1212"); Dial.modem("203,,555-1313");
The Dial.speaker works with DTMF. The Dial.modem works with a serial port. Should we use an interface for this? Why or why not? What would the interface look like if we used one? Would:
```
public interface Dialable {
 public static synchronized void dial(String s);
}

be an ok interface? Why or why not?
```

The "," is used to symbolize a pause of 1 second. Synthesize your tones using an oscillator. How will you parse the string? String.toCharArray may help you.

Pulsing Rate:
Minimum duration of two-frequency tone signal: 50 ms normally; 90 ms if transmitted by radio. Minimum inter-digital time: 45 ms.
Use the 90 ms duration for your program. Keep the 45 ms inter-digit time.

be sure to include digits "0123456789*#ABCD". Your program should not be case sensitive.

How can we make native methods portable? Can we load the correct libraries on demand? How do we know where to get them, or how to install them? How can we detect their proper installation?

What is java web start? Can this help to load correct native libraries? Can you try it?