Java Data Type - 如何显示百分比

import java.text.DecimalFormat;

public class Main {
  public static void main(String[] argv) throws Exception {

    DecimalFormat df = new DecimalFormat("#%");
    System.out.println(df.format(0.19));
    System.out.println(df.format(-0.19));
    System.out.println(df.format(-0.009));
    System.out.println(df.format(-12.009));
  }
}