Concatenates text files and outputs the result to a file.

Cat.java

public class Cat
{
    private Cat() { }

    public static void main( String[] args )
    { 
        Out out = new Out( args[ args.length - 1 ] );

        for ( int i = 0; i < args.length - 1; i++ )
        {
            In in = new In( args[i] );
            String s = in.readAll();
            out.println(s);
            in.close();
        }
        out.close();
    }
}