集合排序

1. 基本数据类型

   Collections.sort(list);//直接从小到大排序或者字母顺序排序

2. 对象排序(根据对象的某个字段)

   Collections.sort(skateboardChildren, new Comparator<SkateboardChild>() {

   @Override

   public int compare(SkateboardChild arg0,SkateboardChild arg1){

   int a=Integer.valueOf(arg0.getPlace());

           int b=Integer.valueOf(arg1.getPlace());

   return a-b;//位数不同

   //return arg0.getTestNo().compareTo(arg1.getTestNo());//位数相同

   //return arg0.getPlace().compareTo(arg1.getPlace());//字母+序号

   }

   });

   ActionContext.getContext().put("_skateboardChild",skateboardChildren);

3.compare

if(chemistryAnalysis!=null){

Collections.sort(chemistryAnalysis, new Comparator<ChemistryAnalysis>() {

@Override

public int compare(ChemistryAnalysis arg0,ChemistryAnalysis arg1){

return arg0.getTestNo().compareTo(arg1.getTestNo());

}

});

}