java double 转为int小数位处理
package com.qiyuan.util; import java.math.BigDecimal; import java.text.DecimalFormat; public class GetIntUtil { /** * (1)四舍五入把double转化int整型,0.5进一,小于0.5不进一 * @param number */ public static int getInt(double number){ BigDecimal bd=new BigDecimal(number).setScale(0, BigDecimal.ROUND_HALF_UP); return Integer.parseInt(bd.toString()); } /** * (2)四舍五入把double转化为int类型整数,0.5也舍去,0.51进一 * @param dou */ public static int DoubleFormatInt(Double dou){ DecimalFormat df = new DecimalFormat("######0"); //四色五入转换成整数 return Integer.parseInt(df.format(dou)); } /** * (3)去掉小数凑整:不管小数是多少,都进一 * @param number */ public static int ceilInt(double number){ return (int) Math.ceil(number); } /** * 保留3位小数 * * @param d 传参 * @return double */ private static double formatDouble1(double d) { return (double) Math.round(d * 1000) / 1000; } }
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