Question

java下标越界问题

一下是我捕获的异常
我执行批量删除七八次之后报这个错，list的值不为空也报
at java.util.ArrayList.RangeCheck(ArrayList.java:547)
at java.util.ArrayList.get(ArrayList.java:322)
at com.office.daoimpl.LoginLogDaoImpl.deletLog(LoginLogDaoImpl.java:48)
at com.office.serviceimpl.LoginLogServiceImpl.deletLog(LoginLogServiceImpl.java:31)

public void deletLog(List loginid){
// TODO Auto-generated method stub
long timestart=System.currentTimeMillis();
start=0;
end=10;
for(int i=0;i<loginid.size();i++ ){
Object obj=loginid.get(i);
List<LoginIog> list=this.getHibernateTemplate().find("from LoginIog where LoginId=?" , obj);
LoginIog loginlog=list.get(0);
try {
this.getHibernateTemplate().delete(loginlog);
} catch (DataAccessException e) {

System.out.println("dao!!!!!");

e.printStackTrace();
}
}
}
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
at java.util.ArrayList.RangeCheck(ArrayList.java:547)
at java.util.ArrayList.get(ArrayList.java:322)
at com.office.daoimpl.LoginLogDaoImpl.deletLog(LoginLogDaoImpl.java:48)

Answer 1

List<LoginIog> list=this.getHibernateTemplate().find("from LoginIog where LoginId=?" , obj);
LoginIog loginlog=list.get(0);
你确定查到数据了？
如果没数据list.get(0)是不是会越界？
应该给个if(list.size>0){list.get(0);}

Answer 2

删的时候从后往前循环
for(int i=loginid.size()-1;i>=0;i-- ){

Answer 3

LoginIog loginlog=list.get(0);
先判断list.size()是否大于0
再取值。

Answer 4

LoginIog loginlog=list.get(0)前加个条件，
if(list.size>0){
LoginIog loginlog=list.get(0);
}