// index.jsp In backend.jsp what does request.getParameter(“one”); return? request.getParameter(“one”).getClass().getName(); returns java.lang.String, so it must be a String right? However I cannot do or This is obvious, because variable one does not return null. Is only way to go, or are there better solutions or a better approach? I am considering both solutions to be on … Read more
On a Mac, by default, mysql is installed to /usr/local/mysql/ The path to the binaries (mysql, mysqladmin, etc.) should therefore be /usr/local/mysql/bin
If you try to decrypt PKCS5-padded data with the wrong key, and then unpad it (which is done by the Cipher class automatically), you most likely will get the BadPaddingException (with probably of slightly less than 255/256, around 99.61%), because the padding has a special structure which is validated during unpad and very few keys … Read more
Cloning the objects before adding them. For example, instead of newList.addAll(oldList); Assuming clone is correctly overriden inPerson.
You can try using System.arraycopy() But, probably better to use clone() in most cases:
In general, the answer to your question is “yes”, but… .equals(…) will only compare what it is written to compare, no more, no less. If a class does not override the equals method, then it defaults to the equals(Object o) method of the closest parent class that has overridden this method. If no parent classes have provided an … Read more
I got a new laptop with Windows 10 and I want to set it up so I can use java and javac from the command line. I have searched online but all the guides are for previous versions, and I don’t want to mess around with something I don’t understand.
The two operands (1 and 3) are integers, therefore integer arithmetic (division here) is used. Declaring the result variable as double just causes an implicit conversion to occur after division. Integer division of course returns the true result of division rounded towards zero. The result of 0.333… is thus rounded down to 0 here. (Note that the processor … Read more
If they do, when do they use it so I can understand it better and know when to use it. A final class is simply a class that can’t be extended. (It does not mean that all references to objects of the class would act as if they were declared as final.) When it’s useful to declare a class … Read more
replace() does 2 things: Remove currently added fragment (A) from the container (C) you indicated Add new fragment (B) to the same container These 2 operations are what is saved as a Backstack record / transaction. Note that fragment A remains in created state, and its view is destroyed. Now popBackStack() reverses your last transaction that you’ve added to BackStack. … Read more