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浮点数保留两位小数
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v = 0.55;
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// 这种方式小数尾数保留两位行不通
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// double doubleValue = new BigDecimal().setScale(2,BigDecimal.ROUND_HALF_UP).doubleValue();
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// return doubleValue * 100;
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NumberFormat nf = NumberFormat.getNumberInstance();
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nf.setMaximumFractionDigits(2);
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return Double.valueOf(nf.format(v * 100));

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