1. 电器类 一个电器销售公司想开发一套管理系统，该公司的主要业务是销售一些家用电器，例如：电冰箱、洗衣机、电视机产品。 经调查，各种电器的属性如下： 冰箱类：品牌、型号、顾色、售价、门款式、制冷方式。 洗衣机类：品牌、型号、顾色、售价、电机类型、洗涤容量。 电视类：品牌、型号、颜色、售价、屏幕尺才、分辨率。 不同的电器有不同的显示信息的方式。 要求：用封装、继承（包括this、super等） 等知识点编程实现。

下面是一个简单的实现，其中包括一个父类ElectricalAppliance和三个子类Fridge、WashingMachine和Television：

public class ElectricalAppliance {
    private String brand;
    private String model;
    private String color;
    private double price;

    public ElectricalAppliance(String brand, String model, String color, double price) {
        this.brand = brand;
        this.model = model;
        this.color = color;
        this.price = price;
    }

    public String getBrand() {
        return brand;
    }

    public void setBrand(String brand) {
        this.brand = brand;
    }

    public String getModel() {
        return model;
    }

    public void setModel(String model) {
        this.model = model;
    }

    public String getColor() {
        return color;
    }

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

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }

    public void showInfo() {
        System.out.println("品牌：" + brand);
        System.out.println("型号：" + model);
        System.out.println("颜色：" + color);
        System.out.println("售价：" + price);
    }
}

public class Fridge extends ElectricalAppliance {
    private String doorStyle;
    private String coolingMethod;

    public Fridge(String brand, String model, String color, double price, String doorStyle, String coolingMethod) {
        super(brand, model, color, price);
        this.doorStyle = doorStyle;
        this.coolingMethod = coolingMethod;
    }

    public String getDoorStyle() {
        return doorStyle;
    }

    public void setDoorStyle(String doorStyle) {
        this.doorStyle = doorStyle;
    }

    public String getCoolingMethod() {
        return coolingMethod;
    }

    public void setCoolingMethod(String coolingMethod) {
        this.coolingMethod = coolingMethod;
    }

    public void showInfo() {
        super.showInfo();
        System.out.println("门款式：" + doorStyle);
        System.out.println("制冷方式：" + coolingMethod);
    }
}

public class WashingMachine extends ElectricalAppliance {
    private String motorType;
    private double washingCapacity;

    public WashingMachine(String brand, String model, String color, double price, String motorType, double washingCapacity) {
        super(brand, model, color, price);
        this.motorType = motorType;
        this.washingCapacity = washingCapacity;
    }

    public String getMotorType() {
        return motorType;
    }

    public void setMotorType(String motorType) {
        this.motorType = motorType;
    }

    public double getWashingCapacity() {
        return washingCapacity;
    }

    public void setWashingCapacity(double washingCapacity) {
        this.washingCapacity = washingCapacity;
    }

    public void showInfo() {
        super.showInfo();
        System.out.println("电机类型：" + motorType);
        System.out.println("洗涤容量：" + washingCapacity);
    }
}

public class Television extends ElectricalAppliance {
    private String screenSize;
    private String resolution;

    public Television(String brand, String model, String color, double price, String screenSize, String resolution) {
        super(brand, model, color, price);
        this.screenSize = screenSize;
        this.resolution = resolution;
    }

    public String getScreenSize() {
        return screenSize;
    }

    public void setScreenSize(String screenSize) {
        this.screenSize = screenSize;
    }

    public String getResolution() {
        return resolution;
    }

    public void setResolution(String resolution) {
        this.resolution = resolution;
    }

    public void showInfo() {
        super.showInfo();
        System.out.println("屏幕尺寸：" + screenSize);
        System.out.println("分辨率：" + resolution);
    }
}

在这个实现中，ElectricalAppliance是所有电器的父类，其中包含一些共同的属性和方法。每个电器类都继承了ElectricalAppliance，并添加了自己特有的属性和方法。每个电器类中都重写了showInfo()方法，以便根据该类的属性显示该电器的信息。