Java Data Type - 如何用DecimalFormat显示货币值

import java.text.DecimalFormat;

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

    DecimalFormat df = new DecimalFormat("\u00a4#,##0.00");
    System.out.println(df.format(4232.19));
    System.out.println(df.format(-4232.19));
  }
}