java实现假分数加减乘除运算

以下是java实现假分数加减乘除运算的示例代码：

假分数类Fraction：

public class Fraction {
    private int numerator; // 分子
    private int denominator; // 分母

    // 构造函数
    public Fraction(int numerator, int denominator) {
        if (denominator == 0) {
            throw new IllegalArgumentException("分母不能为0");
        }
        int gcd = gcd(numerator, denominator);
        this.numerator = numerator / gcd;
        this.denominator = denominator / gcd;
        if (this.denominator < 0) { // 统一分母为正数
            this.numerator = -this.numerator;
            this.denominator = -this.denominator;
        }
    }

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

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

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

    // 除法
    public Fraction divide(Fraction f) {
        if (f.numerator == 0) {
            throw new IllegalArgumentException("除数不能为0");
        }
        int newNumerator = this.numerator * f.denominator;
        int newDenominator = this.denominator * f.numerator;
        return new Fraction(newNumerator, newDenominator);
    }

    // 获取分子
    public int getNumerator() {
        return numerator;
    }

    // 获取分母
    public int getDenominator() {
        return denominator;
    }

    // 判断是否为整数
    public boolean isInteger() {
        return numerator % denominator == 0;
    }

    // 转化为整数
    public int toInteger() {
        return numerator / denominator;
    }

    // 转化为字符串
    public String toString() {
        if (isInteger()) {
            return String.valueOf(toInteger());
        } else {
            return String.format("%d/%d", numerator, 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);
        }
    }
}

测试代码：

public class Main {
    public static void main(String[] args) {
        Fraction f1 = new Fraction(3, 4);
        Fraction f2 = new Fraction(1, 2);
        System.out.println(f1.add(f2)); // 输出5/4
        System.out.println(f1.subtract(f2)); // 输出1/4
        System.out.println(f1.multiply(f2)); // 输出3/8
        System.out.println(f1.divide(f2)); // 输出3/2
    }
}