feezh
          

          我們之所以努力賺錢，是為了讓父母為自己買東西時(shí)能像給我們買東西時(shí)一樣大方!
          

          

          

          隨筆 - 7, 文章 - 0, 評(píng)論 - 10, 引用 - 0
          

          


          		
	
          

          

          
	
          
		
			
          
				數(shù)據(jù)加載中……
			
          
		          		
		
			
          
				
					
	
          
		
          
			Java樹形數(shù)據(jù)（或者說級(jí)聯(lián)）分類
		
          
		
          
		
-
 
這幾天做東西時(shí)遇到一個(gè)樹形數(shù)據(jù)（或者說級(jí)聯(lián)，不會(huì)描述了，就這么叫吧）分類的問題，開始有點(diǎn)糾結(jié)，后想到了一種方法實(shí)現(xiàn)，先分享出來，高手勿噴。

          正文開始
          現(xiàn)有三個(gè)類：分別是Chapter.java Section.java KnowledgePoint.java
          Chapter.java
          private Set sections = new HashSet(0);
          public Set getSections() {
                            return this.sections;
              }

          public void setSections(Set sections) {
                            this.sections = sections;
              }

          Section.java 
          private Chapter chapter;
          private Set knowledgePoints = new HashSet(0);
          public Chapter getChapter() {
                            return this.chapter;
              }

          public void setChapter(Chapter chapter) {
                            this.chapter = chapter;
              }
          public Set getKnowledgePoints() {
                            return this.knowledgePoints;
              }

          public void setKnowledgePoints(Set knowledgePoints) {
                            this.knowledgePoints = knowledgePoints;
              }

          KnowledgePoint.java
          private Section section;
          public Section getSection() {
                            return this.section;
              }

          public void setSection(Section section) {
                            this.section = section;
              }

          可以看出 章節(jié) 有多個(gè)小節(jié)，小節(jié)有多個(gè)知識(shí)點(diǎn)。當(dāng)取得知識(shí)點(diǎn)后怎么根據(jù)不同的章節(jié)和小節(jié)分類呢？

          List<KnowledgePoint> kps = this.allService.getKnowledgePointService()
                          .findPoints(kpIds);          //取得所選擇的知識(shí)點(diǎn)
                      /********** 根據(jù)小節(jié)分類知識(shí)點(diǎn) **********/            Map<Integer, Section> map = new HashMap<Integer, Section>();
                            for (int i = 0; i < kps.size(); i++) {
                      Section section           = kps.get(i).getSection();
                      Integer key           = section.getId();
                                if (!map.containsKey(key)) {
                          section.getKnowledgePoints().clear();
                          map.put(key, section);
                      }
                      map.get(key).getKnowledgePoints().add(kps.get(i));
                  }
                            /********** 根據(jù)章節(jié)分類小節(jié) **********/
                      Map          <Integer, Chapter> cpMap = new HashMap<Integer, Chapter>();
                  Iterator          <Section> it = map.values().iterator();
                            while (it.hasNext()) {
                      Section section           = it.next();
                      Chapter chapter           = section.getChapter();
                      Integer key           = chapter.getId();
                                if (!cpMap.containsKey(key)) {
                          chapter.getSections().clear();
                          cpMap.put(key, chapter);
                      }
                      cpMap.get(key).getSections().add(section);
                  }



           

		
          
		
          
			posted on 2012-05-29 21:41 feezh 閱讀(2594) 評(píng)論(1)  編輯  收藏  所屬分類: Java相關(guān) 
		
          
	
          
	
	


	


          
	    
    


          

          評(píng)論
          
	
	
			
          
				
          
					# website design bangalore  回復(fù)  更多評(píng)論
					  
				
          
				well written, find your style of writing is very rich. Written in a very good, hope you can continue to try hard, to write better!
          
				
          
					2013-02-05 16:40 | web design bangalore
				
          
			
          
		

          





          








          

				
			
          
		          		
	
          
	
          
		
			

		
	
          

          


    







          
        
	




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