Java Number Divide isDivisible(Double a, int b, int decimal)

Description

is Divisible

License

Open Source License

Declaration

public static boolean isDivisible(Double a, int b, int decimal) 

Method Source Code

//package com.java2s;
import java.math.BigDecimal;

public class Main {
    public static boolean isDivisible(Double a, int b, int decimal) {
        boolean result = false;
        Double divideValue = divide(a.toString(), String.valueOf(b), 5, BigDecimal.ROUND_HALF_UP).doubleValue();
        String divideStr = divideValue.toString();
        String remainder = divideStr.substring(divideStr.lastIndexOf(".") + 1);
        if ("0".equals(remainder)) {
            result = true;/* w ww. j a v  a  2s.  c o  m*/
        } else {
            result = remainder.length() == decimal;
        }
        return result;
    }

    /**
     * Double divide
     * @param a
     * @param b
     * @return
     * @Create Sin@2012/2/23
     */
    public static BigDecimal divide(String a, String b, int scale, int roundMode) {
        BigDecimal bd1 = new BigDecimal(a);
        BigDecimal bd2 = new BigDecimal(b);
        return bd1.divide(bd2, scale, roundMode);
    }

    public static Double divide(Double a, Double b, int scale, int roundMode) throws Exception {
        BigDecimal bd1 = new BigDecimal(a.toString());
        BigDecimal bd2 = new BigDecimal(b.toString());
        return bd1.divide(bd2, scale, roundMode).doubleValue();
    }

    public static Double divide(Double a, Double b) {
        BigDecimal bd1 = new BigDecimal(a.toString());
        BigDecimal bd2 = new BigDecimal(b.toString());
        return bd1.divide(bd2).doubleValue();
    }
}

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