Text to Simple Json

package qa10116588765;

import java.util.*;

public class Main {
  private StringBuilder sb;

  public void parse(Scanner in) {
    sb = new StringBuilder();
    sb.append("{");
    while (in.hasNextLine()) {
      Scanner line = new Scanner(in.nextLine());
      String head = line.next();
      if (head.isEmpty()) continue;
      sb.append("" + head + ": \"");
      while (line.hasNext()) {
        sb.append(line.next());
        if (line.hasNext()) sb.append(" ");
      }
      line.close();
      sb.append("\"");
      if (in.hasNextLine()) sb.append(", ");
    }
    in.close();
    sb.append("}");
  }

  @Override
  public String toString() {
    return sb.toString();
  }

  public static void main(String[] args) {
    Main main = new Main();
    Scanner in = new Scanner("aaa\tbbb\nccc\tddd\n");
    // Scanner in = new Scanner(System.in);
    main.parse(in);
    System.out.println(main);
  }
}