分数加减乘除 实现

package com.bean;

public class Fraction {
	private Integer molecule;
	private Integer denominator;//!=0
	
	public Fraction(Integer molecule, Integer denominator){
		this.denominator = denominator;
		this.molecule = molecule;
	}
	
	public Integer getMolecule() {
		return molecule;
	}
	public void setMolecule(Integer molecule) {
		this.molecule = molecule;
	}
	public Integer getDenominator() {
		return denominator;
	}
	public void setDenominator(Integer denominator) {
		this.denominator = denominator;
	}
	
	
	@Override
	public String toString() {
		return "Fraction [molecule=" + molecule + ", denominator="
				+ denominator + "]. " + molecule + "/" + denominator;
	}
	
}

package com.acm;

import com.bean.Fraction;

public class FractionOperation {
	public static Fraction add(Fraction value1, Fraction value2) {
		Fraction ret = new Fraction(value1.getMolecule()
				* value2.getDenominator() + value1.getDenominator()
				* value2.getMolecule(), value1.getDenominator()
				* value2.getDenominator());
		Integer miniDivisor = miniDivisor(ret.getDenominator(),
				ret.getMolecule());
		ret.setDenominator(ret.getDenominator() / miniDivisor);
		ret.setMolecule(ret.getMolecule() / miniDivisor);
		return ret;
	}

	public static Fraction subtrac(Fraction value1, Fraction value2) {
		Fraction ret = new Fraction(value1.getMolecule()
				* value2.getDenominator() - value1.getDenominator()
				* value2.getMolecule(), value1.getDenominator()
				* value2.getDenominator());
		Integer miniDivisor = miniDivisor(ret.getDenominator(),
				ret.getMolecule());
		ret.setDenominator(ret.getDenominator() / miniDivisor);
		ret.setMolecule(ret.getMolecule() / miniDivisor);
		return ret;
	}

	public static Fraction multil(Fraction value1, Fraction value2) {
		Fraction ret = new Fraction(value1.getMolecule()
				* value2.getMolecule(), value1.getDenominator()
				* value2.getDenominator());
		Integer miniDivisor = miniDivisor(ret.getDenominator(),
				ret.getMolecule());
		ret.setDenominator(ret.getDenominator() / miniDivisor);
		ret.setMolecule(ret.getMolecule() / miniDivisor);
		return ret;
	}

	public static Fraction dividen(Fraction value1, Fraction value2) {
		Fraction ret = new Fraction(value1.getMolecule()
				* value2.getDenominator(), value1.getDenominator()
				* value2.getMolecule());
		Integer miniDivisor = miniDivisor(ret.getDenominator(),
				ret.getMolecule());
		ret.setDenominator(ret.getDenominator() / miniDivisor);
		ret.setMolecule(ret.getMolecule() / miniDivisor);
		return ret;
	}

	public static Integer miniDivisor(Integer value1, Integer value2) {
		Integer temp = new Integer(1);
		Integer total = temp;
		
		for (int i = 2, j = value1 / 2 + 1; i < j;) {
			temp = new Integer(i);
			if (value1 % i != 0) {
				i++;
			} else {
				value1 = value1 / i;
				if (value2 % i == 0) {
					total = total * i;
					value2 = value2 / i;
				}
			}
		}
		return total;
	}

	public static Integer leastCommonMultiple(Integer value1, Integer value2) {
		if(miniDivisor(value1, value2) == 1){
			return value1 * value2;
		}
		Integer temp = value1;
		if (value1 < value2) {
			temp = value2;
		}
		
		for (Integer i = temp; i <= value1 * value2; i++) {
			if (i % value1 == 0 && i % value2 == 0) {
				temp = i;
				break;
			}
		}
		return temp;
	}

	public static void main(String[] args) {

		System.out.println(miniDivisor(new Integer(9), new Integer(6)));

		System.out.println(miniDivisor(new Integer(9), new Integer(15)));

		System.out.println(miniDivisor(new Integer(24), new Integer(6)));

		System.out.println(miniDivisor(new Integer(24), new Integer(21)));

		System.out
				.println(leastCommonMultiple(new Integer(24), new Integer(32)));
		
		System.out
				.println(leastCommonMultiple(new Integer(24), new Integer(35)));

		Fraction value1 = new Fraction(4, 15);
		Fraction value2 = new Fraction(2, 9);

		System.out.println(add(value1, value2));
		System.out.println(subtrac(value1, value2));
		System.out.println(multil(value1, value2));
		System.out.println(dividen(value1, value2));
	}
}