double类型转换为int类型四舍五入工具类

FellowPlus 2018-01-20

package com.qiyuan.util;

import java.math.BigDecimal;
import java.text.DecimalFormat;

public class GetInt {
    
    /**
     * (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
     * @return
     */
    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
     * @return
     */
    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
     * @return
     */
    public static int ceilInt(double number){
        return (int) Math.ceil(number);
    }
    
    
    /**
     * 测试
     * @param args
     */
    public static void main(String[] args) {
        System.out.println("getInt============="+getInt(20.5));
        System.out.println("DoubleFormatInt=========="+DoubleFormatInt(20.5));
        System.out.println("ceilInt================="+ceilInt(20.01));
    }

}

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