Problem in loop

[madhoriya22]

I am putting this code segment here.......Problem is, This loop is running only for i = 0, I dont know what is the problem.....Thanks in advance...

 
for(int i = 0; i < v.size(); i++) {
            while(itr.hasNext()) {
                Map.Entry me = (Map.Entry)itr.next();
                System.out.println("i::"+i);
                if((((WorkPackageDetailsVO)v.get(i)).getWorkPackageName()).equals(((WorkPackageSummaryVO)me.getKey()).getWorkPackageName())) {
                    //System.out.println("i:"+i+" TRUE "+me.getKey());
                    String status = ((WorkPackageSummaryVO)me.getKey()).getCurrentDefectStatus();
                    String name = ((WorkPackageSummaryVO)me.getKey()).getWorkPackageName();
                    //System.out.println("----->>>"+status);
                    if(status.equals("On Work Plate"))
                        System.out.println("WorkPackageName: "+name+"  Current Defect Status: "+status+"  Count: "+((WorkPackageSummaryVO)me.getValue()).getCount());
                    else if(status.equals("Fixed"))
                        System.out.println("WorkPackageName: "+name+"  Current Defect Status: "+status+"  Count: "+((WorkPackageSummaryVO)me.getValue()).getCount());
                    else if(status.equals("Removed"))
                        System.out.println("WorkPackageName: "+name+"  Current Defect Status: "+status+"  Count: "+((WorkPackageSummaryVO)me.getValue()).getCount());
                }
            }
        }
 

[itsraghz]

It may be because of the number of entries in Iterator "itr". Probably it might have only one entry.

Can you just check on the number of entries actually present?

[madhoriya22]

It may be because of the number of entries in Iterator "itr". Probably it might have only one entry.

Can you just check on the number of entries actually present?

I check it. Iterator has more than one element. But at the change of i from 0 to 1 while loop is not iterating again......I think at the change of i while loop should start from the begining.....I dont know why its happenin..

[praveen2gupta]

chech value of the v.size(), either this is not working or returned value is 1.
or
while(itr.hasNext()) check the return type of the itr.hasNext(), while loop will work till condition is true. This condition must return the boolean value.

[madhoriya22]

chech value of the v.size(), either this is not working or returned value is 1.
or
while(itr.hasNext()) check the return type of the itr.hasNext(), while loop will work till condition is true. This condition must return the boolean value.

I check itr.hasNext()...for i = 1,2,3 it is returning false......but at the change of i the while loop should start from the begining....any suggestion??

[r035198x]

I check itr.hasNext()...for i = 1,2,3 it is returning false......but at the change of i the while loop should start from the begining....any suggestion??

Is there any relationship between iter and v?

[r035198x]

Is there any relationship between iter and v?

i.e Why are you using both a for and a while to do the looping?

[madhoriya22]

i.e Why are you using both a for and a while to do the looping?

Actually v is a vector it contains workpackageNames.......So I am comparing name in vector and name in iterator......to get the no of counts corresponding to status in that workpackage.....plz tell me if there is any other way to do it......

[r035198x]

Actually v is a vector it contains workpackageNames.......So I am comparing name in vector and name in iterator......to get the no of counts corresponding to status in that workpackage.....plz tell me if there is any other way to do it......

change your loops and put the for inside the while. Once the loop runs for the first i, iter.hasNext is no longer true for subsequent values of i.

[praveen2gupta]

I check itr.hasNext()...for i = 1,2,3 it is returning false......but at the change of i the while loop should start from the begining....any suggestion??

Hi
Your reply
itr.hasNext()...for i = 1,2,3 it is returning false......

while condition is returning a false value so it will not enter in the loop. It should return a true value.

itr.hasNext() is not working or the itr does not have any data. Check itr.

[r035198x]

Hi
Your reply
itr.hasNext()...for i = 1,2,3 it is returning false......

while condition is returning a false value so it will enter in the loop. It should return a true value.

itr.hasNext() is not working or the itr does not have any data. Check itr.

The iterator could have values but it runs through all of them with i = 0 because of the next being called.

[madhoriya22]

The iterator could have values but it runs through all of them with i = 0 because of the next being called.

If I initialize iterator after for loop and before while loop then, will it help me?........

I have already put for loop in while loop........but by doing that output was not according to requirement.......

[r035198x]

If I initialize iterator after for loop and before while loop then, will it help me?........

I have already put for loop in while loop........but by doing that output was not according to requirement.......

Do you understand the logic of the next and hasNext methods?
See here

for (int i = 0; i < v.size(); i++) {
//i = 0;
       while (iter.hasNext()) {
          ....iter.next();
       }
       //while is done => iter.hasNext() is false
       //now when the for index changes to 1, the while loop is not entered
       //any more because iter.hasNext() is false;
}

[madhoriya22]

Do you understand the logic of the next and hasNext methods?
See here

for (int i = 0; i < v.size(); i++) {
//i = 0;
       while (iter.hasNext()) {
          ....iter.next();
       }
       //while is done => iter.hasNext() is false
       //now when the for index changes to 1, the while loop is not entered
       //any more because iter.hasNext() is false;
}

My last reply was half........here v is Vector and iterator is for HashMap

Anyway....got your point......Now its done.....Thanks a lot.....

[joloms38]

hi. there..

how to use while loop in java using an exit?....
my problem is, i can not exit the program using the loop given to me...
please help me.....

[madhoriya22]

hi. there..

how to use while loop in java using an exit?....
my problem is, i can not exit the program using the loop given to me...
please help me.....

inside while loop put a condition when u want to exit........in that condition give System.exit(0)..........

[itsraghz]

inside while loop put a condition when u want to exit........in that condition give System.exit(0)..........

Don't use System.exit(0) unnecessarily. Instead try having a boolean variable as a "flag" and have a conditional execution based upon its value. Make sure you set the flag variables value once you have reached the condition.

Use the features sparingly. Just because its present does not mean you can use everywhere.