java复数类怎么实现

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要实现一个 Java 复数类，你可以按照以下步骤进行：

创建一个名为 Complex 的类，并在该类中声明两个私有变量，用于表示复数的实部和虚部。可以使用 double 类型变量来表示这两个部分。

public class Complex {private double real;
    private double imaginary;
    
    // 构造方法、getter 和 setter 等其他方法 
}

实现 Complex 类的构造方法，以便在创建 Complex 对象时初始化实部和虚部。

public Complex(double real, double imaginary) {this.real = real;
    this.imaginary = imaginary;
}

提供 getter 和 setter 方法，用于获取和设置实部和虚部的值。

public double getReal() {return real;
}

public void setReal(double real) {this.real = real;
}

public double getImaginary() {return imaginary;
}

public void setImaginary(double imaginary) {this.imaginary = imaginary;
}

实现复数加法和乘法的方法。可以使用以下公式计算两个复数的和和积：
- 复数加法：(a + bi) + (c + di) = (a + c) + (b + d)i
- 复数乘法：(a + bi) * (c + di) = (ac – bd) + (ad + bc)i

public Complex add(Complex other) {double realPart = this.real + other.real;
    double imaginaryPart = this.imaginary + other.imaginary;
    return new Complex(realPart, imaginaryPart);
}

public Complex multiply(Complex other) {double realPart = this.real * other.real - this.imaginary * other.imaginary;
    double imaginaryPart = this.real * other.imaginary + this.imaginary * other.real;
    return new Complex(realPart, imaginaryPart);
}

可选：实现 toString 方法，用于以字符串形式表示复数。

@Override
public String toString() {if (imaginary >= 0) {return real + " + " + imaginary + "i";
    } else {return real + " - " + (-imaginary) + "i";
    }
}

这样，你就可以使用这个 Complex 类来表示和操作复数了。例如：

Complex a = new Complex(2, 3);
Complex b = new Complex(4, -1);

Complex sum = a.add(b);
System.out.println("Sum: " + sum);

Complex product = a.multiply(b);
System.out.println("Product: " + product);