我是OOP编程的新手，正在做一个项目。 在某些时候，我必须使用json表示法将信息保存到文件中。 我的课程： FeedGroup
public class FeedGroup implements FeedGroupContract {
private int feedGroupID;
private String feedGroupTitle;
private String feedGroupDescription;
private Feed[] feeds;
private int tamanho;
private final int DEFAULT_SIZE = 10;
/*
private int feedGroupIDGenerator(){
}
*/
public FeedGroup(String feedGroupTitle, String feedGroupDescription) {
this.feeds= new Feed[DEFAULT_SIZE];
this.feedGroupTitle = feedGroupTitle;
this.feedGroupDescription = feedGroupDescription;
}
public FeedGroup(){
this.feeds= new Feed[DEFAULT_SIZE];
}
public FeedGroup(int feedGroupID, String feedGroupTitle, String feedGroupDescription, Feed[] feeds) {
this.feedGroupID = feedGroupID;
this.feedGroupTitle = feedGroupTitle;
this.feedGroupDescription = feedGroupDescription;
this.feeds = new Feed[DEFAULT_SIZE];
}
private void increaseSize() {
this.tamanho++;
}
@Override
public int getID() {
return this.feedGroupID;
}
@Override
public String getTitle() {
return this.feedGroupTitle;
}
@Override
public void setTitle(String string) {
this.feedGroupTitle = feedGroupTitle;
}
@Override
public String getDescription() {
return this.feedGroupDescription;
}
@Override
public void setDescription(String string) {
this.feedGroupDescription = feedGroupDescription;
}
@Override
public boolean addFeed(String feedS) throws GroupException {
Feed newFeed = new Feed();
for (int i = 0; i < this.feeds.length; i++) {
System.out.println("Saving...");
if (this.feeds[i] == null) {
//this.feeds[i] = (Feed) ;
System.out.println("Add object class: " + this.feeds[i]);
System.out.println("Saved successfully.");
increaseSize();
return true;
}
}
return false;
}
@Override
public boolean addFeed(FeedContract fc) throws GroupException {
for (int i = 0; i < this.feeds.length; i++) {
System.out.println("Saving...");
if (this.feeds[i] == null) {
this.feeds[i] = (Feed) fc;
System.out.println("Add object class: " + this.feeds[i]);
System.out.println("Saved successfully.");
increaseSize();
return true;
}
}
return false;
}
@Override
public boolean removeFeed(FeedContract fc) throws ObjectmanagementException {
boolean found = false;
for (int i = 0; i < this.feeds.length; i++) {
if (feeds[i] == fc) {
found = true;
this.feeds[i] = this.feeds[i + 1];
} else {
found = false;
}
}
return found;
}
@Override
public FeedContract getFeed(int i) throws ObjectmanagementException {
return this.feeds[i];
}
@Override
public FeedContract getFeedByID(int i) throws ObjectmanagementException {
Feed found = new Feed();
for (int j = 0; j < this.feeds.length; j++) {
if (feeds[i].getID() == i && this.feeds[i] != null) {
found = this.feeds[i];
}
}
return found;
}
@Override
public int numberFeeds() {
int count = 0;
for (Feed feed : feeds) {
if (feed != null) {
count++;
}
}
return count;
}
@Override
public void getData() {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
@Override
public String toString() {
return "FeedGroup{" + "feedGroupID=" + feedGroupID + ", feedGroupTitle=" + feedGroupTitle + ", feedGroupDescription=" + feedGroupDescription + ", feeds=" + feeds + ", tamanho=" + tamanho + ", DEFAULT_SIZE=" + DEFAULT_SIZE + '}';
}
}
Feed
public class Feed implements FeedContract {
private String feedTitle;
private String feedDescription;
private String feedLanguage;
private Calendar buildDate;
private FeedItem feedItemPos;
private String feedURL;
private String[] categories;
private int categoryID;
private FeedItem[] items;
private int tamanho;
private final int DEFAULT_SIZE = 10;
public Feed(String feedTitle, String feedDescription, String feedLanguage, Calendar buildDate, FeedItem feedItemPos, String feedURL, String[] categories, int categoryID) {
this.feedTitle = feedTitle;
this.feedDescription = feedDescription;
this.feedLanguage = feedLanguage;
this.buildDate = buildDate;
this.feedItemPos = feedItemPos;
this.feedURL = feedURL;
this.categories = categories;
this.categoryID = categoryID;
this.items = new FeedItem[DEFAULT_SIZE];
}
public Feed(String feedGroupURL){
}
public Feed() {
this.items = new FeedItem[DEFAULT_SIZE];
}
@Override
public String getTitle() {
return this.feedTitle;
}
@Override
public void setTitle(String string) {
this.feedTitle = feedTitle;
}
@Override
public String getDescription() {
return this.feedDescription;
}
@Override
public void setDescription(String string) {
this.feedDescription = feedDescription;
}
@Override
public String getLanguage() {
return this.feedLanguage;
}
@Override
public void setLanguage(String string) {
this.feedLanguage = feedLanguage;
}
@Override
public Calendar getBuildDate() {
return this.buildDate;
}
@Override
public void setBuildDate(Calendar clndr) {
this.buildDate = buildDate;
}
private void increaseSize() {
this.tamanho++;
}
@Override
public boolean addItem(String string, String string1, String string2, Calendar clndr, String string3, String string4) {
FeedItem item = new FeedItem(string, string1, string2, clndr, string3, string4);
System.out.println(item.getAuthor());
//System.out.println(items);
if (this.items[0] == null) {
System.out.println("ENTROU");
this.items[0] = item;
} else {
for (int i = 0; i < this.items.length; i++) {
System.out.println("AQUII");
if (items[i] == null) {
items[i] = item;
System.out.println("Add object: " + this.items[i]);
increaseSize();
return true;
}
}
}
return false;
}
@Override
public FeedItemContract getItem(int i) throws ObjectmanagementException {
return this.feedItemPos;
}
@Override
public boolean addCategory(String categoria) {
for (int i = 0; i < this.categories.length; i++) {
if (categories[i] == null) {
categories[i] = categoria;
System.out.println("Add object: " + categoria);
increaseSize();
return true;
}
}
return false;
}
@Override
public String getCategory(int i) throws ObjectmanagementException {
return this.categories[i];
}
@Override
public int numberCategories() {
int count = 0;
for (String category : categories) {
if (category != null) {
count++;
}
}
return count;
}
@Override
public int numberItems() {
int count = 0;
for (FeedItem item : items) {
if (item != null) {
count++;
}
}
return count;
}
@Override
public int getID() {
return this.categoryID;
}
@Override
public String getURL() {
return this.feedURL;
}
@Override
public void setURL(String string) throws FeedException {
this.feedURL = string;
}
}
和应用
public class App implements AppContract {
private FeedGroup feedGroupPosition;
private FeedGroup feedGroupID;
private Tag tag;
private FeedItem feedItem;
private FeedGroup[] groups;
private int tamanho;
public App() {
this.groups = new FeedGroup[10];
}
private void increaseSize() {
this.tamanho++;
}
/**
* Método para adicionar um grupo
*
* @param string titulo do grupo
* @param string1 descrição do grupo
* @return true se adicionar, false se não o fizer
*/
@Override
public boolean addGroup(String string, String string1) {
FeedGroup group = new FeedGroup(string, string1);
//System.out.println(group);
//System.out.println(this.groups.length);
if (this.groups.length == 0) {
this.groups[0] = group;
} else {
for (int i = 0; i < this.groups.length; i++) {
System.out.println("Saving...");
if (this.groups[i] == null) {
this.groups[i] = group;
System.out.println("Add object class: " + this.groups[i]);
System.out.println("Saved successfully.");
increaseSize();
//System.out.println(this.groups.length);
return true;
}
}
}
return false;
}
@Override
public boolean removeGroup(int i) throws ObjectmanagementException {
boolean found = false;
for (int j = i; j < this.groups.length; j++) {
if (groups[j] != null) {
found = true;
this.groups[j] = this.groups[j + 1];
} else {
found = false;
}
}
return found;
}
@Override
public FeedGroupContract getGroup(int i) throws ObjectmanagementException {
return this.groups[i];
}
@Override
public FeedGroupContract getGroupByID(int i) throws ObjectmanagementException {
FeedGroup found = new FeedGroup();
for (int j = 0; j < this.groups.length; j++) {
if (groups[i].getID() == i && this.groups[i] != null) {
found = this.groups[i];
}
}
return found;
}
@Override
public int numberGroups() {
int count = 0;
for (FeedGroup group : groups) {
if (group != null) {
count++;
}
}
return count;
}
@Override
public FeedItemContract[] getItemsByTag(String string) {
//for(int i = 0; i<)
return null;
}
@Override
public void saveGroups() throws Exception {
JSONArray jsonArray = new JSONArray();
JSONObject jsonObject = new JSONObject();
for (int i = 0; i < this.groups.length; i++) {
FeedGroup fg = (FeedGroup) this.getGroup(i);
JSONArray jsonArrayTemp = new JSONArray();
for (int j = 0; j < fg.numberFeeds(); j++) {
Feed feed = (Feed) fg.getFeed(i);
jsonArrayTemp.add(feed.getURL());
}
jsonObject.put("Group", jsonArrayTemp);
jsonObject.put("Title", groups[i].getTitle());
jsonObject.put("Description", groups[i].getDescription());
// System.out.println("URL: "+ groups[i].getFeed(i).getURL());
jsonObject.put("URL", groups[i].getFeed(i).getURL());
// if(groups[i].getFeed(i).getURL() != null){
// jsonObject.put("URL", groups[i].getFeed(i).getURL());
// } else {
// jsonObject.put("URL", "");
// }
jsonArray.add(jsonObject);
}
FileWriter file = null;
file = new FileWriter("group.json");
file.write(jsonArray.toJSONString());
file.flush();
}
@Override
public void loadGroups() throws Exception {
}
@Override
public FeedGroupContract[] getAllGroups() {
return this.groups;
}
@Override
public FeedItemContract[] getAllSavedItems() {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
@Override
public boolean removeSavedItem(int i) {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
}
App类是一种对象容器。 所以在简历中，我想使用json将FeedGroup属性保存在文件中，然后加载该文件。这些方法在App类中实现（saveGroup（）和loadGroup（））。 FeedGroup有一个Feed类的实例：“私有Feed [] feeds”，从Feed类中，我只想获取feedURL来保存在文件中。 我做对了吗？ 我试图做loadResults（）方法来查看其他项目（是的，即使不知道saveGroup（）方法是否正确完成），我也明白了。我必须先使用set然后使用valueOf，但是我认为如果没有正确完成saveGroup（）方法，对我来说一文不值。 有人能帮我吗？ 很抱歉使用long（？）描述。 谢谢。