import java.io.*;

public class CharArrayReaderDemo
{
	public static void main(String[] args)
	{
		String s = "abcdefghijklmnopqrstuvwxyz";
		char[] c = new char[s.length()];
		s.getChars(0, s.length(), c, 0);
		
		try(CharArrayReader car = new CharArrayReader(c))
		{	int i;
			while((i = car.read()) != -1)
				System.out.print((char)i);
		}		catch(IOException ie){ ie.printStackTrace(); }
	}
}
import java.io.*;

public class CharArrayWriterDemo
{
	public static void main(String[] args)
	{
		String s = "abcdefghijklmnopqrstuvwxyz";
		
		CharArrayWriter bas = new CharArrayWriter();
		char[] a = new char[s.length()];
		s.getChars(0, s.length(), a, 0);
		
		try{ bas.write(a); }
		catch(IOException ie){ ie.printStackTrace(); }
				  
		char[] b = bas.toCharArray();
		for(int c: b)
			System.out.print((char)c);
		System.out.println();
	}
}