java编写代码实现假分数加减乘除运算

以下是Java代码实现假分数加减乘除运算的示例：

import java.util.Scanner;

public class Fraction {

    private int numerator; // 分子
    private int denominator; // 分母

    public Fraction(int numerator, int denominator) {
        this.numerator = numerator;
        this.denominator = denominator;
    }

    // 获取最大公约数
    private int gcd(int a, int b) {
        if (b == 0) {
            return a;
        } else {
            return gcd(b, a % b);
        }
    }

    // 约分
    private Fraction reduce() {
        int gcd = gcd(numerator, denominator);
        return new Fraction(numerator / gcd, denominator / gcd);
    }

    // 转化为假分数
    private Fraction toImproperFraction() {
        int newNumerator = numerator + denominator * (numerator / denominator);
        return new Fraction(newNumerator, denominator);
    }

    // 加法
    public Fraction add(Fraction other) {
        int newNumerator = numerator * other.denominator + other.numerator * denominator;
        int newDenominator = denominator * other.denominator;
        return new Fraction(newNumerator, newDenominator).reduce();
    }

    // 减法
    public Fraction subtract(Fraction other) {
        int newNumerator = numerator * other.denominator - other.numerator * denominator;
        int newDenominator = denominator * other.denominator;
        return new Fraction(newNumerator, newDenominator).reduce();
    }

    // 乘法
    public Fraction multiply(Fraction other) {
        int newNumerator = numerator * other.numerator;
        int newDenominator = denominator * other.denominator;
        return new Fraction(newNumerator, newDenominator).reduce().toImproperFraction().reduce();
    }

    // 除法
    public Fraction divide(Fraction other) {
        int newNumerator = numerator * other.denominator;
        int newDenominator = denominator * other.numerator;
        return new Fraction(newNumerator, newDenominator).reduce().toImproperFraction().reduce();
    }

    // 输出假分数
    @Override
    public String toString() {
        int wholeNumber = numerator / denominator;
        int newNumerator = numerator % denominator;
        return wholeNumber + " " + Math.abs(newNumerator) + "/" + denominator;
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.print("请输入第一个假分数的分子和分母：");
        int numerator1 = scanner.nextInt();
        int denominator1 = scanner.nextInt();
        Fraction fraction1 = new Fraction(numerator1, denominator1);

        System.out.print("请输入第二个假分数的分子和分母：");
        int numerator2 = scanner.nextInt();
        int denominator2 = scanner.nextInt();
        Fraction fraction2 = new Fraction(numerator2, denominator2);

        System.out.println("假分数加法结果为：" + fraction1.add(fraction2));
        System.out.println("假分数减法结果为：" + fraction1.subtract(fraction2));
        System.out.println("假分数乘法结果为：" + fraction1.multiply(fraction2));
        System.out.println("假分数除法结果为：" + fraction1.divide(fraction2));
    }
}

代码中使用了 `Fraction` 类来表示假分数，并提供了加减乘除运算的方法。在运算过程中，需要进行约分和转化为假分数的操作，最终输出的结果也是假分数的形式。在 `main` 方法中，从控制台输入两个假分数，然后输出它们的加减乘除结果。