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1)   ¸ñʽ»¯ÕûÊý(°Ñ¸¡µãÊýת»¯ÎªÕûÊý)
       NumberFormat nf = NumberFormat.getIntegerInstance();
       double v=12.6;
       System.out.println(nf.format(v));
       Êä³ö½á¹û13£¬ÒòΪ×Ô¶¯ÉáÈëµÄ¡£
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       ·½·¨Ò»:
       DecimalFormat df=new DecimalFormat("#.##");
       double v=12.126;
       String s=df.format(v);
       System.out.println(s);
       Êä³öµÄ½á¹ûΪ:12.13
       ·½·¨¶þ:
       double v=-32.126;
       String s=v+"";
       System.out.println(s.substring(0, s.indexOf(".")+3));
       (²»ÍƼöʹÓô˷½·¨£¬ÒòΪÈç¹ûÔ­Êý²»´æÔÚСÊýµã»òÕßСÊýµãºóÖ»ÓÐ1Ϊ»áÓÐÒì³£)
3)   ¸ñʽ»¯¸¡µãÊý£¨±äΪxx%ÐÎʽ£©
       NumberFormat nf = NumberFormat.getPercentInstance();
       double s=0.6145;
       System.out.println(nf.format(s));
       Êä³ö61%


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