list的排序方法

1.实现Comparator接口再实现方法
public class ComparatorAnswer implements Comparator{

/**
* 排序方法
*/
public int compare(Object arg0, Object arg1) {
TSalQuestionarypaper ts1=(TSalQuestionarypaper)arg0;
TSalQuestionarypaper ts2=(TSalQuestionarypaper)arg1;
//首先比较前面，如果前面相同，则比较后面
int flag=ts1.getIndexNo().compareTo(ts2.getIndexNo());
if(flag==0){
   return ts1.getOptions().compareTo(ts2.getOptions());
}else{
   return flag;
}
}
}
2.调用
ComparatorAnswer comparator=new ComparatorAnswer();
Collections.sort(list, comparator);//用于排序list,还可用于泛型