一些小变换

一些小转换

/** * 四舍五入 */  DecimalFormat   df=new   DecimalFormat("#");   //不保留小数点  double   d=0;   double  PriceInRate = 0;DecimalFormat df4  = new DecimalFormat("###.0000");if(PriceInRate > 0){PriceInRate = Double.parseDouble(df4.format(PriceInRate));//保留四位小数}

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/** * 得到系统前5天时间 * <p>Author: sisi * <p>Create Time: 2010-8-26 */Calendar calendar = Calendar.getInstance();//系统当前时间        calendar.add(Calendar.DATE, -5);    //得到前5天        String  yesterDayDate  = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(calendar.getTime());        System.out.println(yesterDayDate);

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/** * 路径的替换 * <p>Author: sisi * <p>Create Time: 2010-8-26 */??String filePath = "aa \\bb\\\\cc\\\\\\\\dd";??System.out.println("filePath =" + filePath);??filePath = filePath.replaceAll("\\\", "\\\\\\\");??System.out.println("filePath2 =" + filePath);

/** * Substring */String a = "123456789";System.out.println("substring:"+a.substring(1, a.length()));System.out.println("a.length():"+a.length());//substring:23456789//a.length():9

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