import java.lang.StringBuilder;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;

public class Main {

	public static void main(String[] args) {
		// Prints "Hello, World" to the terminal window.
		StringBuilder str = new StringBuilder();
		FileReader fis = null;
		FileWriter fileWriter = null;
		BufferedReader reader = null;
		try {
			File file = new File("F:\\stocks.json");
			fis = new FileReader(file);
//
			reader = new BufferedReader(fis);

			str.append("[\n");

			for (String line = reader.readLine(); line != null; line = reader.readLine()) {
				str.append(line).append(",\n");
			}

			str.setLength(str.length() - 2);
			str.append("\n]");
			fileWriter = new FileWriter(file);
			fileWriter.write(str.toString());

		} catch (Exception ex) {
			ex.printStackTrace();

		} finally {
			try {
				if (reader != null) {
					reader.close();
				}
				fis.close();
				fileWriter.close();
			} catch (Exception e) {
				e.printStackTrace();
			}

		}
	}
}