java中访问列表索引时出现索引越界异常
我有一个列表,当我尝试访问该列表的索引时,它会给出索引越界异常,当我用另一种方法打印该索引的值时,它会显示我无法理解的结果,当值位于该特定索引时,为什么会抛出java.lang.IndexOutOfBoundsException:index:0,Size:0 我的java代码是-java中访问列表索引时出现索引越界异常,java,list,indexoutofboundsexception,Java,List,Indexoutofboundsexception,我有一个列表,当我尝试访问该列表的索引时,它会给出索引越界异常,当我用另一种方法打印该索引的值时,它会显示我无法理解的结果,当值位于该特定索引时,为什么会抛出java.lang.IndexOutOfBoundsException:index:0,Size:0 我的java代码是- public List<Vacc_vs6> refarray_vac1(String fdate,String ldate) throws SQLException, ParseException {
public List<Vacc_vs6> refarray_vac1(String fdate,String ldate) throws SQLException, ParseException {
st_jsp.clear();
try
{
con = getConnection();
stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);
String vs1= "sql query";
stmt.executeQuery(vs1);
rs = stmt.getResultSet();
while (rs.next()) {
Vacc_vs6 ref = new Vacc_vs6();
ref.setLogtime(rs.getString(1));
ref.setBeam_current(rs.getString(2));
ref.setBeam_energy(rs.getString(3));
ref.setst4_vs6_bag1_rb(rs.getString(4));
ref.setst4_vs6_bag2_rb(rs.getString(5));
ref.setst4_vs6_bag3_rb(rs.getString(6));
ref.setst4_vs6_bag4_rb(rs.getString(7));
ref.setst4_vs6_bag5_rb(rs.getString(8));
ref.setst4_vs6_bag6_rb(rs.getString(9));
ref.setst4_vs6_bag7_rb(rs.getString(10));
ref.setst4_vs6_bag8_rb(rs.getString(11));
ref.setst4_vs6_bag9_rb(rs.getString(12));
st_jsp.add(ref);
}
}
catch( Exception e )
{
System.out.println("\nException in refarray_vac1 "+e);
}
List<Vacc_vs6> new_list=new ArrayList<Vacc_vs6>();
double is = 9.5;
double js = 10.5;
int no=0;
for(no=0;no<=10;no++)
{
String i= st_jsp.get(no).getBeam_current();//**Showing exception here**
double im = Double.parseDouble(i) ;
if(im>is && im<js)
{
new_list.addAll(st_jsp);
}
else
{
new_list.addAll(st_jsp);
}
is +=10;js +=10;
}
return st_jsp;
}
public List refarray_vac1(字符串fdate,字符串ldate)抛出SQLException,ParseException{
st_jsp.clear();
尝试
{
con=getConnection();
stmt=con.createStatement(ResultSet.TYPE\u SCROLL\u SENSITIVE,ResultSet.CONCUR\u READ\u);
字符串vs1=“sql查询”;
执行程序(vs1);
rs=stmt.getResultSet();
while(rs.next()){
Vacc_vs6 ref=新的Vacc_vs6();
参考setLogtime(rs.getString(1));
参考setBeam_电流(rs.getString(2));
参考setBeam_energy(rs.getString(3));
参考设置4_vs6_bag1_rb(rs.getString(4));
参考设置4_vs6_bag2_rb(rs.getString(5));
参考设置4_vs6_bag3_rb(rs.getString(6));
参考设置4_vs6_bag4_rb(rs.getString(7));
参考设置4_vs6_bag5_rb(rs.getString(8));
参考设置4_vs6_bag6_rb(rs.getString(9));
参考设置4_vs6_bag7_rb(rs.getString(10));
参考设置4_vs6_bag8_rb(rs.getString(11));
参考设置4_vs6_bag9_rb(rs.getString(12));
st_jsp.add(ref);
}
}
捕获(例外e)
{
System.out.println(“\n重构中的异常”+e);
}
List new_List=new ArrayList();
双is=9.5;
双js=10.5;
int no=0;
对于(no=0;nois&&imis&&im您假设st_jsp
至少包含11个元素:
for (no=0;no<=10;no++) {
String i= st_jsp.get(no).getBeam_current();
for(no=0;no在不知道有多少st_jsp列表的情况下循环到10
将您的循环替换为
for(no=0;no<st_jsp.size();no++)
for(no=0;no@tiddirastogi我读了你的编辑。if(im>is&&im)
for (no=0;no<st_jsp.size();no++) {
String i= st_jsp.get(no).getBeam_current();
for(no=0;no<st_jsp.size();no++)