Java 复数类实现：加法和减法运算

import java.util.Scanner;

class Complex { private double realPart; private double imaginaryPart;

// 无参构造方法
public Complex() {
    this.realPart = 0.0;
    this.imaginaryPart = 0.0;
}

// 带参构造方法
public Complex(double realPart, double imaginaryPart) {
    this.realPart = realPart;
    this.imaginaryPart = imaginaryPart;
}

// 获取实部
public double getRealPart() {
    return realPart;
}

// 设置实部
public void setRealPart(double realPart) {
    this.realPart = realPart;
}

// 获取虚部
public double getImaginaryPart() {
    return imaginaryPart;
}

// 设置虚部
public void setImaginaryPart(double imaginaryPart) {
    this.imaginaryPart = imaginaryPart;
}

// 复数加法运算
public Complex add(Complex other) {
    double real = this.realPart + other.getRealPart();
    double imaginary = this.imaginaryPart + other.getImaginaryPart();
    return new Complex(real, imaginary);
}

// 复数减法运算
public Complex sub(Complex other) {
    double real = this.realPart - other.getRealPart();
    double imaginary = this.imaginaryPart - other.getImaginaryPart();
    return new Complex(real, imaginary);
}

// 重写toString方法，返回复数的字符串表示形式
public String toString() {
    return realPart + "+" + imaginaryPart + "i";
}

}

public class Main { public static void main(String[] args) { Complex a = new Complex(); Complex b = new Complex(); Scanner in = new Scanner(System.in); a.setRealPart(in.nextDouble()); a.setImaginaryPart(in.nextDouble()); b.setRealPart(in.nextDouble()); b.setImaginaryPart(in.nextDouble()); System.out.println(a); System.out.println(b); System.out.println(a.add(b)); System.out.println(a.sub(b)); } }