斯坦福大学开放课程——编程方法 作业7

 

    For this assignment, you will create an application that keeps tracks of the information in such a simple social network.  More specifically, your application will allow for user profiles to be added to, deleted from, or looked-up in the social network.  Moreover, for each profile, you will keep track of the  person's  name associated with that profile, an optional image that  the person  may wish to display with  his/her  profile, an optional "current status" for the profile  (which is basically  just a String  indicating what activity the owner of that profile is currently engaged in), and a list of friends for each profile.

 

 

FacePamphlet.java

/* * File: FacePamphlet.java * ----------------------- * When it is finished, this program will implement a basic social network * management system. */import acm.program.*;import acm.graphics.*;import acm.util.*;import java.awt.event.*;import javax.swing.*;public class FacePamphlet extends Program implements FacePamphletConstants {//public class FacePamphlet extends ConsoleProgram implements FacePamphletConstants {/** * This method has the responsibility for initializing the * interactors in the application, and taking care of any other * initialization that needs to be performed. */public void init() {// You fill this in//布局初始化initComponent();//添加监听器addActionListeners(); } /** * This class is responsible for detecting when the buttons are * clicked or interactors are used, so you will have to add code * to respond to these actions. */ public void actionPerformed(ActionEvent e) {// You fill this in as well as add any additional methods Object source = e.getSource(); name = nameField.getText().trim(); boolean isContain = userData.containsProfile(name); //添加对象 if(source == addButton){ if(name.equals("")){ canvas.showMessage("Profile's name cann't be empty"); } else{ //判断是否已经存在该用户 if(isContain){ //已经存在，输出错误信息 canvas.showMessage("A profile with the name <" + name + "> already exists"); } else{ //不存在，添加该用户 userProfile = new FacePamphletProfile(name); userData.addProfile(userProfile); canvas.displayProfile(userData.getProfile(name)); canvas.showMessage("New profile created"); } } } //删除对象 if(source == deleteButton){ //判断是否存在该用户 if(isContain){ //若存在，则首先删除其好友信息，然后再删除该用户的profile //1. 清除其相关好友中该用户的信息 userProfile = userData.getProfile(name); FacePamphletProfile friendProfile; if(userProfile.getFriends() != null){ while(userProfile.getFriends().hasNext()){ String friendName = userProfile.getFriends().next(); friendProfile = userData.getProfile(friendName); friendProfile.removeFriend(name); userData.addProfile(friendProfile); userProfile.removeFriend(friendName); userData.addProfile(userProfile); if(userProfile.getFriends() == null) break; } } //2.从数据库中删除该用户 userData.deleteProfile(name); canvas.displayProfile(null); canvas.showMessage("Profile of <" + name + "> deleted"); } else{ //不存在，输出错误信息 canvas.showMessage("A profile with the name <" + name + "> does not exist"); } } //查找目标对象 if(source == findButton){ //判断是否存在该用户 if(isContain){ //若存在，则显示相关信息 userProfile = userData.getProfile(name); canvas.displayProfile(userProfile); canvas.showMessage("Displaying <" + name + ">"); } else{ //不存在，输出错误信息 canvas.displayProfile(null); canvas.showMessage("A profile with the name <" + name + "> does not exist"); } } //更改状态 if(source == statusButton){ changeStatus(name,isContain); } //更改图片 if(source == pictureButton){ changePhoto(name,isContain); } //添加好友 if(source == friendButton){ addFriend(name,isContain); }} /** * 键盘监听处理程序 */ public void keyTyped(KeyEvent e){ Object gobj = e.getSource(); name = nameField.getText(); boolean isContain = userData.containsProfile(name); if(e.getKeyChar() == '/n'){ if(gobj == statusField){ changeStatus(name,isContain); } if(gobj == pictureField){ changePhoto(name,isContain); } if(gobj == friendField){ addFriend(name,isContain); } } } /** * 窗口布局初始化 */ private void initComponent(){ //程序窗口大小设置 setSize(APPLICATION_WIDTH,APPLICATION_HEIGHT); canvas = new FacePamphletCanvas(); add(canvas); //窗口上部组件add(new JLabel("Name"),NORTH);nameField = new JTextField(TEXT_FIELD_SIZE);add(nameField,NORTH);addButton = new JButton("Add");add(addButton,NORTH);deleteButton = new JButton("Delete");add(deleteButton,NORTH);findButton = new JButton("Lookup");add(findButton,NORTH);//窗口左部组件statusField = new JTextField(TEXT_FIELD_SIZE);statusField.addKeyListener(this);add(statusField,WEST);statusButton = new JButton("Change Status");add(statusButton,WEST);add(new JLabel(EMPTY_LABEL_TEXT),WEST);pictureField = new JTextField(TEXT_FIELD_SIZE);pictureField.addKeyListener(this);add(pictureField,WEST);pictureButton = new JButton("Change Picture");add(pictureButton,WEST);add(new JLabel(EMPTY_LABEL_TEXT),WEST);friendField = new JTextField(TEXT_FIELD_SIZE);friendField.addKeyListener(this);add(friendField,WEST);friendButton = new JButton("Add Friend");add(friendButton,WEST); } /** * 更新用户的状态 * * @param name —— 用户名 * @param isContain —— 用户是否存在 */ private void changeStatus(String name,boolean isContain){ //判断是否存在该用户if(isContain){//存在，则更新状态信息String status = statusField.getText();userProfile = userData.getProfile(name);userProfile.setStatus(status);userData.addProfile(userProfile);canvas.displayProfile(userProfile);canvas.showMessage("Status updated to <" + status + ">");}else{//不存在，输出错误信息canvas.showMessage("Please select a profile to change status");} } /** * 更新用户头像 * * @param name —— 用户名 * @param isContain —— 判断用户是否存在 */ private void changePhoto(String name,boolean isContain){ //判断是否存在该用户if(isContain){//存在，则先测试图片是否存在，若存在则更新String fileName = pictureField.getText();userProfile = userData.getProfile(name);GImage image = null;try{image = new GImage(fileName);userProfile.setImage(image);userData.addProfile(userProfile);canvas.displayProfile(userProfile);canvas.showMessage("Picture updated");}catch(ErrorException ex){canvas.showMessage("Unable to open image file : <" + fileName + ">");}}else{//不存在，输出错误信息canvas.showMessage("Please select a profile to change picture");} } /** * 添加好友 * * @param name —— 用户名 * @param isContain —— 判读用户是否存在 */ private void addFriend(String name,boolean isContain){ //判断是否存在该用户if(isContain){//存在，则判断好友是否存在String friendName = friendField.getText();isContain = userData.containsProfile(friendName);if(isContain){//好友数据存在，则添加userProfile = userData.getProfile(name);if(userProfile.addFriend(friendName)){userData.addProfile(userProfile);userProfile = userData.getProfile(friendName);userProfile.addFriend(name);userData.addProfile(userProfile);canvas.displayProfile(userData.getProfile(name));canvas.showMessage("<" + friendName + "> added as a friend");}else{canvas.showMessage("<" + name + "> already has <" + friendName + "> as a friend");}}else{//好友不存在，输出错误信息canvas.showMessage("<" + friendName + "> does not exist");}}else{//不存在，输出错误信息canvas.showMessage("Please select a profile to add friend");} } /* Private instance Variables */ //窗口布局实例变量 private JTextField nameField; private JTextField statusField; private JTextField pictureField; private JTextField friendField; private JButton addButton; private JButton deleteButton; private JButton findButton; private JButton statusButton; private JButton pictureButton; private JButton friendButton; private FacePamphletCanvas canvas; private FacePamphletDatabase userData = new FacePamphletDatabase(); private FacePamphletProfile userProfile; private String name;} 

 

FacePamphletCanvas.java

/* * File: FacePamphletCanvas.java * ----------------------------- * This class represents the canvas on which the profiles in the social * network are displayed. NOTE: This class does NOT need to update the * display when the window is resized. */import acm.graphics.*;import java.awt.*;import java.util.*;public class FacePamphletCanvas extends GCanvas implements FacePamphletConstants {/** * Constructor * This method takes care of any initialization needed for * the display */public FacePamphletCanvas() {// You fill this in}/** * This method displays a message string near the bottom of the * canvas. Every time this method is called, the previously * displayed message (if any) is replaced by the new message text * passed in. */public void showMessage(String msg) {// You fill this inif(message != null) remove(message);//若已显示其他信息，则删除message = new GLabel(msg);message.setFont(MESSAGE_FONT);//标签所在坐标double xPos = (getWidth() - message.getWidth())/2,yPos = getHeight() - BOTTOM_MESSAGE_MARGIN - message.getAscent();add(message,xPos,yPos);}/** * This method displays the given profile on the canvas. The * canvas is first cleared of all existing items (including * messages displayed near the bottom of the screen) and then the * given profile is displayed. The profile display includes the * name of the user from the profile, the corresponding image * (or an indication that an image does not exist), the status of * the user, and a list of the user's friends in the social network. */public void displayProfile(FacePamphletProfile profile) {// You fill this inremoveAll();if(profile != null){//添加姓名name = new GLabel(profile.getName());name.setFont(PROFILE_NAME_FONT);name.setColor(Color.BLUE);add(name,LEFT_MARGIN,name.getAscent() + TOP_MARGIN);//添加图片GImage image = profile.getImage();if(image == null){GRect picRect = new GRect(IMAGE_WIDTH,IMAGE_HEIGHT);add(picRect,LEFT_MARGIN,name.getY() + IMAGE_MARGIN);GLabel info = new GLabel("No Image");info.setFont(PROFILE_IMAGE_FONT);add(info,picRect.getX() + (picRect.getWidth() - info.getWidth())/2,picRect.getY() + (picRect.getHeight() + info.getAscent())/2);}else{image.setSize(IMAGE_WIDTH, IMAGE_HEIGHT);add(image,LEFT_MARGIN,name.getY() + IMAGE_MARGIN);}//添加状态信息status = new GLabel(name.getLabel() + " is " + profile.getStatus());status.setFont(PROFILE_STATUS_FONT);add(status,LEFT_MARGIN,name.getY() + status.getAscent() + IMAGE_MARGIN + IMAGE_HEIGHT + STATUS_MARGIN);//添加好友信息friendTitle.setFont(PROFILE_FRIEND_LABEL_FONT);add(friendTitle,LEFT_MARGIN + IMAGE_WIDTH + 80,name.getY() + IMAGE_MARGIN);Iterator<String> friend = profile.getFriends();if(friend != null){int i = 1;while(friend.hasNext()){GLabel label = new GLabel(friend.next());label.setFont(PROFILE_FRIEND_FONT);add(label,friendTitle.getX(),friendTitle.getY() + i * label.getAscent());i++;}}}}/* Private Instance Variable *//** 姓名标签 */private GLabel name;/** 状态标签 */private GLabel status;/** 好友标签 */private GLabel friendTitle = new GLabel("Freinds:");/** 程序信息标签 */private GLabel message;} 

 

FacePamphletConstants.java (相关常量定义，不做修改，所以不再贴出)

 

FacePamphletDatabase.java

/* * File: FacePamphletDatabase.java * ------------------------------- * This class keeps track of the profiles of all users in the * FacePamphlet application. Note that profile names are case * sensitive, so that "ALICE" and "alice" are NOT the same name. */import java.util.*;public class FacePamphletDatabase implements FacePamphletConstants {/** * Constructor * This method takes care of any initialization needed for * the database. */public FacePamphletDatabase() {// You fill this inprofileMap = new HashMap<String,FacePamphletProfile>(); }/** * This method adds the given profile to the database. If the * name associated with the profile is the same as an existing * name in the database, the existing profile is replaced by * the new profile passed in. */public void addProfile(FacePamphletProfile profile) {// You fill this inprofileMap.put(profile.getName(), profile);}/** * This method returns the profile associated with the given name * in the database. If there is no profile in the database with * the given name, the method returns null. */public FacePamphletProfile getProfile(String name) {// You fill this in. Currently always returns null.boolean isExist = containsProfile(name);if(isExist){return profileMap.get(name);}else{return null;}}/** * This method removes the profile associated with the given name * from the database. It also updates the list of friends of all * other profiles in the database to make sure that this name is * removed from the list of friends of any other profile. * * If there is no profile in the database with the given name, then * the database is unchanged after calling this method. */public void deleteProfile(String name) {// You fill this inboolean isExist = containsProfile(name);if(isExist){profileMap.remove(name);}}/** * This method returns true if there is a profile in the database * that has the given name. It returns false otherwise. */public boolean containsProfile(String name) {// You fill this in. Currently always returns false.boolean isContain = profileMap.containsKey(name);if(isContain){return true;}else{return false;}}/* Private Instance Variable*/private HashMap<String,FacePamphletProfile> profileMap;} 

 

FacePamphletProfile.java

/* * File: FacePamphletProfile.java * ------------------------------ * This class keeps track of all the information for one profile * in the FacePamphlet social network. Each profile contains a * name, an image (which may not always be set), a status (what * the person is currently doing, which may not always be set), * and a list of friends. */import acm.graphics.*;import java.util.*;public class FacePamphletProfile implements FacePamphletConstants {/** * Constructor * This method takes care of any initialization needed for * the profile. */public FacePamphletProfile(String name) {// You fill this inthis.name = name;status = "";image = null;friendList = new ArrayList<String>();}/** This method returns the name associated with the profile. */ public String getName() {// You fill this in. Currently always returns the empty string.//return "";return name;}/** * This method returns the image associated with the profile. * If there is no image associated with the profile, the method * returns null. */ public GImage getImage() {// You fill this in. Currently always returns null.//return null;return image;}/** This method sets the image associated with the profile. */ public void setImage(GImage image) {// You fill this inthis.image = image;}/** * This method returns the status associated with the profile. * If there is no status associated with the profile, the method * returns the empty string (""). */ public String getStatus() {// You fill this in. Currently always returns the empty string.//return "";return status;}/** This method sets the status associated with the profile. */ public void setStatus(String status) {// You fill this inthis.status = status;}/** * This method adds the named friend to this profile's list of * friends. It returns true if the friend's name was not already * in the list of friends for this profile (and the name is added * to the list). The method returns false if the given friend name * was already in the list of friends for this profile (in which * case, the given friend name is not added to the list of friends * a second time.) */public boolean addFriend(String friend) {// You fill this in. Currently always returns true.//判断是否已经存在该好友，是则返回falsefor(int i=0;i < friendList.size();i++){if(friendList.get(i).equals(friend)){return false;}}//若不存在，则添加boolean isFalse = friendList.add(friend);if(isFalse){return true;}else return false;}/** * This method removes the named friend from this profile's list * of friends. It returns true if the friend's name was in the * list of friends for this profile (and the name was removed from * the list). The method returns false if the given friend name * was not in the list of friends for this profile (in which case, * the given friend name could not be removed.) */public boolean removeFriend(String friend) {// You fill this in. Currently always returns false.boolean isSuccess = friendList.remove(friend);if(isSuccess){return true;}else return false;}/** * This method returns an iterator over the list of friends * associated with the profile. */ public Iterator<String> getFriends() {// You fill this in. Currently always returns null.//return null;if(friendList.isEmpty()){return null;}else{Iterator<String> friend = friendList.iterator();return friend;}}/** * This method returns a string representation of the profile. * This string is of the form: "name (status): list of friends", * where name and status are set accordingly and the list of * friends is a comma separated list of the names of all of the * friends in this profile. * * For example, in a profile with name "Alice" whose status is * "coding" and who has friends Don, Chelsea, and Bob, this method * would return the string: "Alice (coding): Don, Chelsea, Bob" */ public String toString() {// You fill this in. Currently always returns the empty string.//return "";String userInfo = name + " (" + status + ") : ";for(int i=0;i < friendList.size() - 1;i++){userInfo += friendList.get(i) + ", ";}if(0 != friendList.size()){userInfo += friendList.get(friendList.size() - 1);}return userInfo;}/* Private Instance Variable*/private String name;private String status;private GImage image;private ArrayList<String> friendList;}