code: package tools;
  
  import java.io.File;
  import java.io.FileNotFoundException;
  import java.io.PrintWriter;
  import java.io.UnsupportedEncodingException;
  
  public class OptClearJar {
      public static void main(String args[]) throws FileNotFoundException, UnsupportedEncodingException {
  	String dataRuns = "examples/dataRuns.txt";
  	String outputPath = "outputs/";
  
  	String[] data = new tools.IO().readFile(dataRuns);
  	PrintWriter writer = new PrintWriter(dataRuns, "UTF-8");
  	writer.println(data[0]);
  	writer.println("current runs: 0");
  	writer.close();
  
  	File[] files = new File(outputPath).listFiles();
  	for (int i = 0; i < files.length; i++) {
  	    files[i].delete();
  	}
      }
  }
  