二级栏目树构建

输出栏目树

public class Entry {
 int categoryId;
 int parentId;
 String categoryName;
 
 public Entry(){
  this.parentId=0;
 }
 
 public int getCategoryId() {
  return categoryId;
 }
 public void setCategoryId(int categoryId) {
  this.categoryId = categoryId;
 }
 public int getParentId() {
  return parentId;
 }
 public void setParentId(int parentId) {
  this.parentId = parentId;
 }
 public String getCategoryName() {
  return categoryName;
 }
 public void setCategoryName(String categoryName) {
  this.categoryName = categoryName;
 }
}

public class test1 {
 
 public static void main(String[] args) {
  List allCategoryList=new ArrayList();
  for(int i=1;i<=10;i++){
   Entry entry=new Entry();
   entry.setCategoryId(i);
   entry.setParentId(0);
   entry.setCategoryName("一级栏目"+i);
   allCategoryList.add(entry);
   
   Entry subentry=new Entry();
   subentry.setCategoryId(11+i);
   subentry.setParentId(i);
   subentry.setCategoryName("2级栏目"+i);
   allCategoryList.add(subentry);
  }
  for(int i=0;i<10;i++){
   
  }
  makeTree(allCategoryList);
 }
 
 public static void makeTree(List allCategoryList){
  for(int i=0;i<allCategoryList.size();i++){
   Entry parentCategory=(Entry) allCategoryList.get(i);
   if(parentCategory.getParentId()==0){ //输出第一级栏目
    System.out.println(parentCategory.getCategoryName());
   }
   for(int j=0;j<allCategoryList.size();j++){
    Entry subCategory=(Entry) allCategoryList.get(j);
    if(subCategory.getParentId()==parentCategory.getCategoryId()){ //输出第2级栏目
     System.out.println(" ├  "+subCategory.getCategoryName());
    }
   }
  }
 }
 
}

 

评论

2 楼 zhq426 2011-05-30  

一辈子的程序员啊

1 楼 zhq426 2011-05-30  

目前考虑只有2层的，还不知到3层的怎么弄啊，兄弟们给个建议啊