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...Problem Set 2

...Problem Set 2

The class java.io.OutputStream is an abstract class. Subclass and implement the abstract method to create a kind of output stream called a NumStream. Your NumStream class work in a similar fashion to the NumBuilder in problem set 1, converting digits to strings.

NumStream.java
1	*import java.io.;**
2	public class NumStream extends OutputStream {
3	public void write(int c) throws IOException {
4	// What goes here?
5	}
6
7	public static void main(String[] args) {
8	NumStream ns = new NumStream();
9	PrintWriter pw = new PrintWriter(new OutputStreamWriter(ns));
10	pw.println("123456789 and ! and # ");
11	pw.flush(); // needed for anything to happen, try taking it out
12	}
13	}
$ javac NumStream.java

Create a subclass of java.lang.RuntimeException called HashException and modify NumStream to throw it when your NumStream class encounters a hash character (#).
Repeat the last exercise, but this time name your exception BangException and have it extend java.io.IOException. Run your code and observe the differences.
The class java.io.File can be used to open directories (folders) and read their contents. Write a java program that uses File to open the current directory (named ".") and list the files present inside it. You will have to do some online research to learn more about java.io.File.