任务1： 写一个名为Rectangle的类表示矩形。其属性包括宽width、高height和颜色color，width和height都是double型的，而color则是String类型的。要求该类具有： (1) 使用构造函数完成各属性的初始赋值 (2) 使用getter和setter的形式完成属性的访问及修改 (3) 提供计算面积的getArea()方法 (4) 重写toString()方法，输出矩形信息 (5) 自己增加与Rectangle类相关的方法 任务2：声明复数类Complex，成员变量包括实部和虚部，类型均为double。要求该类具有 (1) 实现多个构造方法（如无参构造方法、1个参数构造方法，2个参数构造方法，字符串参数的构造方法）。 (2) 使用getter和setter完成属性的访问和修改 (3) 成员方法包括实现复数加法add、减法minus、乘法multiply，计算模长length (4) 重写equals()方法，只有当两个复数实部和虚部都相等时，才返回真 (5) 重写toString()，输出复数信息 (6) 在main方法中，使用实际数据测试成员方法

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下面是您提出的任务：

任务1：Rectangle类的代码如下：

public class Rectangle {
    private double width;
    private double height;
    private String color;

    public Rectangle(double width, double height, String color) {
        this.width = width;
        this.height = height;
        this.color = color;
    }

    public double getWidth() {
        return width;
    }

    public void setWidth(double width) {
        this.width = width;
    }

    public double getHeight() {
        return height;
    }

    public void setHeight(double height) {
        this.height = height;
    }

    public String getColor() {
        return color;
    }

    public void setColor(String color) {
        this.color = color;
    }

    public double getArea() {
        return width * height;
    }

    @Override
    public String toString() {
        return "Rectangle{" +
                "width=" + width +
                ", height=" + height +
                ", color='" + color + '\'' +
                '}';
    }

    public String getColorAndSize() {
        return "This rectangle is " + color + " and has a width of " + width + " and a height of " + height;
    }
}

任务2：Complex类的代码如下：

public class Complex {
    private double real;
    private double imaginary;

    public Complex() {
        this.real = 0;
        this.imaginary = 0;
    }

    public Complex(double real) {
        this.real = real;
        this.imaginary = 0;
    }

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

    public Complex(String str) {
        String[] parts = str.split("\\+|i");
        this.real = Double.parseDouble(parts[0]);
        this.imaginary = Double.parseDouble(parts[1]);
    }

    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;
    }

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

    public Complex minus(Complex other) {
        return new Complex(this.real - other.real, this.imaginary - other.imaginary);
    }

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

    public double length() {
        return Math.sqrt(this.real * this.real + this.imaginary * this.imaginary);
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (obj == null || obj.getClass() != this.getClass()) {
            return false;
        }
        Complex other = (Complex) obj;
        return Double.compare(this.real, other.real) == 0 && Double.compare(this.imaginary, other.imaginary) == 0;
    }

    @Override
    public String toString() {
        return this.real + "+" + this.imaginary + "i";
    }
}

在main方法中，我们可以测试Rectangle类和Complex类的各项功能，例如：

public static void main(String[] args) {
    Rectangle rectangle = new Rectangle(5, 10, "blue");
    System.out.println(rectangle); // 输出：Rectangle{width=5.0, height=10.0, color='blue'}
    System.out.println(rectangle.getColorAndSize()); // 输出：This rectangle is blue and has a width of 5.0 and a height of 10.0
    System.out.println(rectangle.getArea()); // 输出：50.0

    Complex c1 = new Complex(1, 2);
    Complex c2 = new Complex(3, 4);
    System.out.println(c1.add(c2)); // 输出：4.0+6.0i
    System.out.println(c1.minus(c2)); // 输出：-2.0-2.0i
    System.out.println(c1.multiply(c2)); // 输出：-5.0+10.0i
    System.out.println(c1.length()); // 输出：2.23606797749979
    System.out.println(c1.equals(new Complex(1, 2))); // 输出：true
    System.out.println(c1.equals(new Complex(2, 1))); // 输出：false
    System.out.println(c1); // 输出：1.0+2.0i
}