Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
I have an Iterable<MyRecord> records . I iterate over the records like below and add it to a LinkedList as shown below.
for (MyRecord record: records){
sortedList.addLast(record);
}
My iterable has 3 records, all with different values. But in the end although sortedList contains 3 records, ALL THREE ARE THE SAME!!!. How come?
When I printed out the memory location, it’s the same for all 3. What am I doing wrong?
Actually your comment reveals the missing link to why this is going wrong. You’re using this in a Hadoop mapper or reducer. The trick with Hadoop is that it reuses the objects you’re getting in, so that it goes easy on the garbage collector. What you thus have to do is make a copy of each of the objects in your source iterable (the
MyRecords), and add those to your LinkedList.