模拟分数的类 Fraction代码,Java代码库,德仔网

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【Java】模拟分数的类 Fraction
作者:Dezai.CN / 发布于2011/7/13/ 513
<div>public class FractionTest {

 public static void main(String[] args) {
 Fraction a = new Fraction(7, 32);
 Fraction b = new Fraction(13, 32);
 System.out.println(a + " + " + b + " = " + a.add(b) + "(" + a.add(b).doubleValue() + ")");
 System.out.println(a + " - " + b + " = " + a.minus(b) + "(" + a.minus(b).doubleValue() + ")");
 System.out.println(a + " * " + b + " = " + a.multiply(b) + "(" + a.multiply(b).doubleValue() + ")");
 System.out.println(a + " / " + b + " = " + a.devide(b) + "(" + a.devide(b).doubleValue() + ")");
 }
}

// 分数
class Fraction {
 private int numerator; // 分子

 private int denominator; // 分母

 Fraction(int numerator, int denominator) {
 if (denominator == 0) {
 throw new IllegalArgumentException("分母不能为 0");
 }

 this.numerator = numerator;
 this.denominator = denominator;
 shrink();
 }

 Fraction() {
 this(0, 1);
 }

 public int getNumerator() {
 return numerator;
 }

 public void setNumerator(int numerator) {
 this.numerator = numerator;
 }

 public int getDenominator() {
 return denominator;
 }

 public void setDenominator(int denominator) {
 this.denominator = denominator;
 }

 // 分子分母同除以最大公约数
 private Fraction shrink() {
 int maxCommonDivisor = getMaxCommonDivisor(this.denominator, this.numerator);
 this.numerator /= maxCommonDivisor;
 this.denominator /= maxCommonDivisor;
 return this;
 }

 // 辗转相除法求最大公约数
 private int getMaxCommonDivisor(int a, int b) {
 int mod = a % b;

 if (mod == 0) {
 return b;
 } else {
 return getMaxCommonDivisor(b, mod);
 }
 }

 // 分数加法
 public Fraction add(Fraction that) {
 return new Fraction(this.numerator * that.denominator + this.denominator * that.numerator,
 this.denominator * that.denominator);
 }

 // 分数减法
 public Fraction minus(Fraction that) {
 return new Fraction(this.numerator * that.denominator - this.denominator * that.numerator,
 this.denominator * that.denominator);
 }

 // 分数乘法
 public Fraction multiply(Fraction that) {
 return new Fraction(this.numerator * that.numerator,
 this.denominator * that.denominator);
 }

 // 分数除法
 public Fraction devide(Fraction that) {
 return new Fraction(this.numerator * that.denominator,
 this.denominator * that.numerator);
 }

 public double doubleValue() {
 return (double) numerator / denominator;
 }

 @Override
 public String toString() {
 return String.format("{%d/%d}", this.numerator, this.denominator);
 }
}
试试其它关键字
　Fraction　
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