CsvWriter.txt

1. What design principles does this program violate?
Single Responsibility by writing in the logic - and thus need to be decoupled
2. Refactor the program to improve its design.

CsvWriter.java

public class CsvWriter {
	PrintWriter writer;

	public CsvWriter() {
	}

	public void setPrinter(/*some args to actually select how you want to output*/){
	     writer = new PrintWriter(System.out);
	}

	public void write(String[][] lines) {
		for (int i = 0; i < lines.length; i++)
			writeLine(lines[i]);
	}

	private void writeLine(String[] fields) {
		if (fields.length == 0)
			writer.write("\n");
		else {
			writeField(fields[0]);

			for (int i = 1; i < fields.length; i++) {
				writer.write(",");
				writeField(fields[i]);
			}
			writer.write("/n");
		}
	}

	private void writeField(String field) {
		if (field.indexOf(',') != -1 || field.indexOf('\"') != -1)
			writeQuoted(field);
		else
			writer.write(field);
	}

	private void writeQuoted(String field) {
		writer.write('\"');
		for (int i = 0; i < field.length(); i++) {
			char c = field.charAt(i);
			if (c == '\"')
				writer.write.print("\"\"");
			else
				writer.write.print(c);
		}
		writer.write('\"');
	}
}