java 10.23 (分数的运算)

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构造分数类页面

package com.lovo;/** * 分数类 * @author 骆昊 * */public class Rational {private int num;// 分子private int den;// 分母/** * 构造器 * @param num 分子 * @param den 分母 */public Rational(int num, int den) {this.num = num;this.den = den;normalize();}/** * 构造器 * @param str 代表一个分数的字符串 */public Rational(String str) {String[] s1 = str.split("/");// 分子的字符串String[] s2 = str.split("/");// 分母的字符串this.num = Integer.parseInt(s1[0]);this.den = Integer.parseInt(s2[1]);normalize();}/** * 构造器 * @param x 一个小数 */public Rational(double x) {this.num = (int) (x * 10000);this.den = 10000;simplify();normalize();}/** * public   Rational add(Rational other) { ... } * 访问修饰符  返回类型     方法名(参数列表)       { ... } * 加法 * @param other 另一个分数 * @return 两个分数相加的结果 */public Rational add(Rational other) {return new Rational(this.num * other.den + this.den * other.num, this.den * other.den).normalize();}/** * 减法 * @param other 另一个分数 * @return 两个分数相减的结果 */public Rational sub(Rational other) {return new Rational(this.num * other.den - this.den * other.num, this.den * other.den).normalize();}/** * 乘法 * @param other 另一个分数 * @return 两个分数相乘的结果 */public Rational mul(Rational other) {return new Rational(this.num * other.num, this.den * other.den).normalize();}/** * 除法 * @param other 另一个分数 * @return 两个分数相除的结果 */public Rational div(Rational other) {return new Rational(this.num * other.den, this.den * other.num).normalize();}/** * 化简 * @return 化简后的分数对象 */public Rational simplify() {if(num != 0) {int divisor = gcd(Math.abs(num),Math.abs(den));num /= divisor;den /= divisor;}return this;}/** * 正规化 * @return 正规化以后的分数对象 */public Rational normalize() {if(this.num == 0) {this.den = 1;}else if(this.den < 0) {this.den = - this.den;this.num = - this.num;}return this;}/** * 把对象按字符串打印出来 */public String toString() {if(num==den){return 1+"";}return num + (den != 1? ("/" + den) : "");}/** * 公约数 * @param x * @param y * @return */private int gcd(int x, int y) {if(x > y) {int temp = x;x = y;y = temp;}for(int i = x; i > 1; i--) {if(x % i == 0 && y % i == 0) {return i;}}return 1;}}

调用页面

package com.lovo;import java.util.Scanner;public class Test01 {public static void main(String[] args) {Scanner sc = new Scanner(System.in);System.out.print("r1 = ");String str1 = sc.next();Rational r2 = new Rational(2/4);Rational r1 = new Rational(str1);System.out.printf("%s + %s = %s\n", r1, r2, r1.add(r2).simplify());System.out.printf("%s - %s = %s\n", r1, r2, r1.sub(r2).simplify());System.out.printf("%s * %s = %s\n", r1, r2, r1.mul(r2).simplify());System.out.printf("%s / %s = %s\n", r1, r2, r1.div(r2).simplify());sc.close();}}

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