1, Experiment purpose and requirements

1. Experimental purpose

1. Master how to use classes to create and encapsulate objects;
2. Master how to define and construct a class;
3. Master method overload and polymorphism;
4. Master the combination of objects and the method of parameter value transfer;
5. Understand and master the differences between class variables and instance variables, and between class methods and instance methods.

2. Experimental requirements

1. Understand and master various basic concepts of class and object;
2. Master how to define classes and create objects;
3. Master how to write programs to verify the basic concepts and determine whether the concepts are correctly understood;
4. Various problems in the experiment are analyzed and summarized.

2, Experimental environment

1. Hardware requirements: one computer (with Windows 10 operating system)
2. Software requirements: JDK-14.0.2, Intellij IDEA 2020.1.2

3, Experimental contents (experimental scheme, experimental steps, design ideas, etc.)

1. Experimental scheme: generate and run the prepared Java class file to see whether it meets the expected effect.
2. Experimental steps: create java project and Java class file, write code and generate Java program, run and test.
3. Design idea:
   1. Create java project, package and Java class file first;
   2. Program to create a class Phone and a class Property;
      a) Programming to define various instance variables, instance functions, class variables and class functions;
      b) Programming to realize the functions of object combination, constructor, overload and polymorphism;
      c) Create a phone class object phone in the main function to set the relevant data of the mobile phone;
      d) Output through the show() function;
      e) Through Qusetion_one() and question_ The two() function asks whether to connect to the Internet and play music;
      f) Enter yes and no through the keyboard to select;
   3. Improve relevant functions and codes, generate Java programs, check whether the results are correct, and complete the experimental report.

4, Experimental results and analysis

5, Attached source code

package experiment.two;

import java.util.Scanner;

class Property//Define class
{   //Define properties
    protected String name;//Brand name
    protected String Network_Support;//Supported network operators
    protected String Volume;//Ringing tone
    public Property(String name,String Network_Support,String Volume)
    {//Parametric construction method
        this.name=name;
        this.Network_Support=Network_Support;
        this.Volume=Volume;
    }
}

class Phone//Define class
{
    //Define properties
    protected String size;//Instance variables: Dimensions
    protected String color;//Instance variables: color
    protected String RAM;//Instance variables: memory
    protected String pixel_front;//Instance variable: front lens pixels
    protected String pixel_rear;//Instance variable: rear lens pixels
    protected static String length;//Class variables: length
    protected static String width;//Class variable: width
    protected static String thickness;//Class variable: thickness

    protected Property property;//Object composition declares the object of the Property class

    public Phone(String name,String Network_Support,String Volume)
    {//Parametric construction method
        this.property=new Property(name,Network_Support,Volume);//Object combination
    }
    public static String get_Size(double l,double w,double t)
    {//Overloaded method class method
        length=String.valueOf(l);//Convert numbers to strings
        width=String.valueOf(w);//Convert numbers to strings
        thickness=String.valueOf(t);//Convert numbers to strings
        return length+"mm"+" × "+width+"mm"+" × "+thickness+"mm";
    }
    public void get_Phone(int ram1,int ram2)
    {//Overloaded method instance method
        String r1,r2;
        r1=String.valueOf(ram1);//Convert numbers to strings
        r2=String.valueOf(ram2);//Convert numbers to strings
        RAM=r1+"GB+"+r2+"GB";
    }
    public void get_Phone(String c1, String c2)
    {//Overloaded method instance method
        String cs1,cs2;
        cs1=c1.trim().substring(0,c1.indexOf("colour"));//Remove all spaces before and after the string and intercept the string
        cs2=c2.trim().substring(0,c2.indexOf("colour"));//Remove all spaces before and after the string and intercept the string
        color=cs1+"+"+cs2+"colour";
    }

    public void get_Phone(int f,int r1,int r2,int r3)
    {//Overloaded method instance method
        String Front,Rear1,Rear2,Rear3;
        Front=String.valueOf(f);//Convert numbers to strings
        Rear1=String.valueOf(r1);//Convert numbers to strings
        Rear2=String.valueOf(r2);//Convert numbers to strings
        Rear3=String.valueOf(r3);//Convert numbers to strings
        pixel_front=Front+"Megapixel";
        pixel_rear=Rear1+"ten thousand+"+Rear2+"ten thousand+"+Rear3+"Megapixel";
    }

    public void get_Network(String whether)//Behavior: Networking
    {
        switch (whether)
        {
            case "yes":
                System.out.println(property.name+"The mobile phone has been successfully connected to the Internet. The network operator is:"+property.Network_Support);
                break;
            case "no":
                System.out.println(property.name+"The mobile phone failed to connect to the Internet successfully");
                break;
            default:break;
        }
    }
    public void get_Volume(String whether)
    {//Behavior: play ringtones
        switch (whether)
        {
            case "yes":
                System.out.println(property.name+"Ringtone played successfully:"+property.Volume);
                break;
            case  "no":
                System.out.println(property.name+"The phone failed to play the ringtone successfully");
                break;
            default:break;
        }
    }
    public void show() //Output relevant parameters of mobile phone
    {
        System.out.println("mobile phone:"+property.name);
        System.out.println("Memory:"+RAM);
        System.out.println("size:"+size);
        System.out.println("Front lens pixels:"+pixel_front+"  Rear lens pixels:"+pixel_rear);
        System.out.println("Color:"+color);
        System.out.println("Network operator:"+property.Network_Support);
        System.out.println("Ringtone:"+property.Volume);
    }
    public void Question_one()//Definition question: ask whether you want to connect to the Internet
    {
        System.out.println("Do you need to connect to the Internet? (please enter "yes" or "no")");
    }
    public void Question_two()//Definition question: ask whether to play the ringtone
    {
        System.out.println("Do you want to play the ringtone? (please enter "yes" or "no")");
    }
}
public class program_1 {
    public static void main(String[] args) {
        Phone phone=new Phone("Huawei mate20","telecom","<Dream It Possible>");
//Create object and initialize
        phone.get_Phone(16,256);//polymorphic
        phone.get_Phone("navy blue","Bright white");//polymorphic
        phone.get_Phone(2400,1200,1600,800);
        phone.size=phone.get_Size(158.2,77.2,8.3);//Call class function
        phone.show();//Call the function to output the relevant parameters of the mobile phone

        phone.Question_one();//Call the function and ask whether it is online
        Scanner scanner1=new Scanner(System.in);//Call the system class and input data through the keyboard
        String w1=scanner1.nextLine().trim();//Read the input and remove the front and back spaces
        phone.get_Network(w1);//Call function, networking
        phone.Question_two();//Call the function to ask whether to play the ringtone
        Scanner scanner2=new Scanner(System.in);//Call the system class and input data through the keyboard
        String w2=scanner2.nextLine().trim();//Read the input and remove the front and back spaces
        phone.get_Volume(w2);//Call the function to play the ringtone
    }
}