I’ve seen similar behaviour in the past and know of two possible reasons: Your build path has somehow changed, leaving out your Node class, or the project providing it has compile errors, or similar. Given your description of the problem, this probably isn’t relevant in your case. Some Eclipse screwup. For me, this was always … Read more
The simplest one-line solution is this: The above solution is destructive, meaning that contents of the original set1 my change.If you don’t want to touch your existing sets, create a new set:
Without code and mappings for your transactions, it’ll be next to impossible to investigate the problem. However, to get a better handle as to what causes the problem, try the following: In your hibernate configuration, set hibernate.show_sql to true. This should show you the SQL that is executed and causes the problem. Set the log … Read more
String.contains String.contains works with String, period. It doesn’t work with regex. It will check whether the exact String specified appear in the current String or not. Note that String.contains does not check for word boundary; it simply checks for substring. Regex solution Regex is more powerful than String.contains, since you can enforce word boundary on … Read more
What does it do? It prints the component as if you hadn’t overridden the paintComponent method. If you have a background color set for instance, this is typically painted by the class you’re extending. When do we need to use it? You use it if you don’t paint on the entire component. The parts that … Read more
find /usr/lib/jvm/java-1.x.x-openjdk vim /etc/profilePrepend sudo if logged in as not-privileged user, ie. sudo vim Press ‘i’ to get in insert mode add:export JAVA_HOME=”path that you found” export PATH=$JAVA_HOME/bin:$PATH logout and login again, reboot, or use source /etc/profile to apply changes immediately in your current shell
For lists, we use the Collections.sort(List) method. What if we want to sort a HashSet?
The Arrays class has versions of sort() and binarySearch() which don’t require a Comparator. For example, you can use the version of Arrays.sort() which just takes an array of objects. These methods call the compareTo() method of the objects in the array.
So I have tried the previously proposed answer to my question. but I am still having the same error message: I am trying to load the rJava library in R Please help, Thanks
This is not a synchronization problem. This will occur if the underlying collection that is being iterated over is modified by anything other than the Iterator itself. This will throw a ConcurrentModificationException when the it.hasNext() is called the second time. The correct approach would be Assuming this iterator supports the remove() operation.