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       NumberFormat nf = NumberFormat.getIntegerInstance();
       double v=12.6;
       System.out.println(nf.format(v));
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       DecimalFormat df=new DecimalFormat("#.##");
       double v=12.126;
       String s=df.format(v);
       System.out.println(s);
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       ·½·¨¶þ:
       double v=-32.126;
       String s=v+"";
       System.out.println(s.substring(0, s.indexOf(".")+3));
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       double s=0.6145;
       System.out.println(nf.format(s));
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