package print;import java.awt.*;import java.awt.print.*;public class SaleOrderReturnPrintable implements Printable {  public SaleOrderReturnPrintable() {  }  public int print(Graphics g, PageFormat pf, int pageIndex)      throws PrinterException {    //創建打印面板    SaleOrderReturnPrintPane saleOrderReturnPrintPane = new SaleOrderReturnPrintPane();    //繪畫打印面板的文字，并且輸送至打印機    saleOrderReturnPrintPane.drawPages((Graphics2D) g );    return Printable.PAGE_EXISTS;  }}