The FacebookPerson Example. Dr. Xiaolin Hu CSC 2310, Spring 2015

Transcription

1 The FacebookPerson Example Dr. Xiaolin Hu CSC 2310, Spring 2015

2 Motivation Whenever you are happy, update your facebook!

3 Start from Simple A Facebook Person Class A test class

4 public class FacebookPerson{ private String myname; protected String mymood; public FacebookPerson(String name){ myname = name; public String getname(){ return myname; public void setmood(string newmood){ mymood = newmood; public String getmood(){ return mymood;

5 A Simple test Class public class simple_test{ public static void main (String[] args){ FacebookPerson fbp = new FacebookPerson("Dr. Hu"); fbp.setmood("happy"); // end main

6 Elaborate the story A user can create multiple persons (with different names). Each person has its own facebook displayed as a window. A user can select a person and type in the mood for that person. As a result, the selected person s facebook is updated in the following way: when the mood is happy, the facebook has a red background and the mood is displayed on the window. Otherwise, the window has a white background and the mood is displayed on the window.

7 The Design User (test class) FacebookPerson Facebook Create FacebookPerson Type in mood Create Facebook Update Facebook Create window Update window

8 The classes Facebook Constructor function Create the facebook window setcontent() Update the facebook window FacebookPerson Constructor function Create a Facebook object for the person setname(), getname() setmood(), getmood() The setmood() will ask the Facebook object to update the content A class with the main() to receive user s inputs main() Create the Facebook person

9 The Facebook Class import java.awt.*; public class Facebook{ private String name; private String content; DrawingPanel panel; private Graphics g; public Facebook_Graphics(String nm){ content = "undefined"; name = nm; // Create the drawing panel panel = new DrawingPanel(200, 150); g = panel.getgraphics(); // display name g.drawstring(name+"'s mood is undefined.", 20, 75); public void setcontent(string newcontent){ content = newcontent; if(content.equals("happy")){ g.setcolor(color.red); g.fillrect(0, 0, 200, 150); g.setcolor(color.black); // display mood g.drawstring(name+"'s mood is:"+ "happy", 20, 75); else{ g.setcolor(color.white); g.fillrect(0, 0, 200, 150); g.setcolor(color.black); g.drawstring(name+"'s mood is:"+ content, 20, 75); public String getcontent(){ return content;

10 Test the Facebook class public class simple_test{ public static void main (String[] args){ Facebook fb = new Facebook("Dr. Hu"); fb.setcontent("happy"); // end main

11 The FacebookPerson Class public class FacebookPerson{ private String myname; private String mymood; private Facebook myfacebook; public FacebookPerson_Graphics(String name){ myname = name; myfacebook = new Facebook(myName); public String getname(){ return myname; public void setmood(string newmood){ mymood = newmood; myfacebook.setcontent(mymood); public String getmood(){ return mymood;

12 A Simple test Class public class simple_test{ public static void main (String[] args){ FacebookPerson fbp = new FacebookPerson("Dr. Hu"); fbp.setmood("happy"); // end main Know what objects are created, and when they are created.

13 A more advanced user interface import java.util.*; public class testfacebook{ public static void main (String[] args){ // Prompt user to enter the number of facebookpresons Scanner userinput = new Scanner(System.in); System.out.println("Enter the number of facebookpresons to be created: "); int nump = userinput.nextint(); FacebookPerson[] fbp = new FacebookPerson[numP]; //Ask the user to enter the name for each person, and create the persons for(int i=0; i< nump; i++){ System.out.println("Enter the name for person "+ (i+1)+ ":"); String name = userinput.next(); fbp[i] = new FacebookPerson(name); System.out.println(" select a person and type the mood below "); to be continued

14 A more advanced user interface (cont.) //Ask the user to set the mood for a person, and update the mood, enter "####" to exit while(true){ System.out.println("Enter the name for a person (enter #### to exit):"); String name = userinput.next(); if(name.equals("####")) System.exit(0); int personid = -1; for(int i=0; i< nump; i++){ if(fbp[i].getname().equals(name)){ personid = i; break; if(personid!=-1){ // found the person System.out.println("Enter the mood for the person:"); String mood = userinput.next(); fbp[personid].setmood(mood); else System.out.println("unrecognized name!"); // end while // end main

15 Demo Java code on Class Webpage

16 Exercise A user can create multiple persons (with different names). Each person has its own facebook displayed as a window. A user can select a person and type in the mood for that person. As a result, the selected person s facebook is updated in the following way: when the mood is happy, the facebook window has a red background and the mood is displayed on the window. When the mood is sad, the window has a blue background and the mood is displayed on the window. Otherwise, the window has a white background and the mood is displayed on the window.

17 Exercise (cont.) Instead of each person has its own Facebook window, all persons will be shown on the same Facebook window (in three columns).