import java.io.*;

public class StringBufferSample {

	public static void main(String[] args) throws IOException {
		Character[] rapCharArray = new Character[5];

		rapCharArray[0] = new Character('a');
		rapCharArray[1] = new Character('b');
		rapCharArray[2] = new Character('c');
		rapCharArray[3] = new Character('d');
		rapCharArray[4] = new Character('e');

		StringBuffer sb = new StringBuffer();
		for ( int i = 0; i < rapCharArray.length; i++ ) {
			sb.append(rapCharArray[i]);
		}
		System.out.println(sb);
	}
}