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.
You need the sleep method of the Thread class. public static void sleep (long time) Causes the thread which sent this message to sleep for the given interval of time (given in milliseconds). The precision is not guaranteed – the Thread may sleep more or less than requested. Parameters time The time to sleep in … Read more
I am trying to write a String validation to match any character (regular, digit and special) except =. Here is what I have written – But, it matches the input string “2009-09/09 12:23:12.5=” with the pattern. How can I exclude = (or any other character, for that matter) from the pattern string?
You could easily use String.replace():
Using the constructor BigInteger(String val) Translates the decimal String representation of a BigInteger into a BigInteger. Javadoc