Calculates BigDecimal divided by total in percent form e.g. - Java java.math

Java examples for java.math:BigDecimal Calculation

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Description

Calculates BigDecimal divided by total in percent form e.g.

Demo Code


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

public class Main {
    public static void main(String[] argv) throws Exception {
        int num = 2;
        int total = 2;
        System.out.println(percent(num, total));
    }//  w w  w  .j av a2  s . c o m

    /**
     * Calculates num divided by total in percent form
     * e.g. percent(5, 100)= 5.00
     * @param num the number to divide
     * @param total the number to be divided
     * @return num divided by total in percent form
     */
    public static BigDecimal percent(int num, int total) {
        BigDecimal bNum = new BigDecimal(num)
                .multiply(new BigDecimal("100"));
        return divide(bNum, total);
    }

    /**
     * Calculates num multiply i
     * @param num the number
     * @param i the number
     * @return num multiply i
     */
    public static BigDecimal multiply(BigDecimal num, int i) {
        return num.multiply(new BigDecimal(i)).setScale(2,
                BigDecimal.ROUND_HALF_UP);
    }

    /**
     * Calculates i multiply num
     * @param i the number
     * @param num the number
     * @return i multiply num
     */
    public static BigDecimal multiply(int i, BigDecimal num) {
        return multiply(num, i);
    }

    /**
     * Calculates num divided by total3
     * e.g. divide(5, 100)= 0.05
     * @param num the number to divide
     * @param total the number to be divided
     * @return num divided by total
     */
    public static BigDecimal divide(BigDecimal num, int total) {
        if (total == 0) {
            throw new IllegalArgumentException(
                    "Total cannot be ZERO when dividing");
        }
        BigDecimal bTotal = new BigDecimal(total);
        return num.divide(bTotal, 2, BigDecimal.ROUND_HALF_UP);
    }
}

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