package threeExam;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.Reader;
import java.io.Writer;

/**
 * 第三次考試--刪除單行注釋
 * 
 * @author HOLLY
 * 
 */
public class DeleteAnnotation {
	/**
	 * 程序入口
	 * 
	 * @param args
	 * @throws IOException
	 */
	public static void main(String[] args) throws IOException {
		operate(args[0]);
	}

	/**
	 * 讀取每一行，同時對讀到的每一行進行處理
	 * 
	 * @param string
	 * @throws IOException
	 */
	private static void operate(String string) throws IOException {
		BufferedReader reader = new BufferedReader(new FileReader(string));
		PrintWriter writer = new PrintWriter(new FileWriter(string + ".clean",
				true));
		String line;
		while ((line = reader.readLine()) != null) {
			int i;
			if ((i = line.indexOf("//")) != -1) {
				writer.printf("%s%s", line.substring(0, i), "\r\n");
			} else {
				writer.printf("%s%s", line, "\r\n");
			}
		}
		close(reader, writer);
	}

	/**
	 * 對輸入輸出流進行關閉
	 * 為保證第一句關閉語句出錯后，保證后面的關閉還要繼續執行要用異常進行處理
	 * @param reader
	 * @param writer
	 * @throws IOException
	 */
	private static void close(Reader reader, Writer writer) throws IOException {
		if (reader != null) {
			try {
				reader.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		if (writer != null) {
			try {
				writer.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}

	}

}