The @ symbol in java
The @ symbol specifies the Annotation types. This represents some metadata associated to your code The at sign character (@) indicates to the compiler that what follows is an annotation.
Java
unreported exception java.io.FileNotFoundException; must be caught or declared to be thrown
You need to put the file processing statements inside a method:
How to send Https Post request in java
Wrong :- (Extra space is there in mid of www- form) Correct
Java Undefined Object
By “undefined object as a parameter”, I assume you mean that you’re looking to write a function that doesn’t specify the type of the object in the function declaration, allowing you to only have one function. This can be done with generics. Instead of: you can have: Test: See Java generics for more information.
Why does cache use Most Recently Used (MRU) algorithm as evict policy?
Imagine you were looking up the details of buses as they arrived at a bus stop, based on their bus number (or whatever identifier you use). It’s somewhat reasonable to think that if you’ve just seen a number 36 bus, you’re less likely to see another one imminently than to see one of the other buses that stops there. … Read more
Hadoop “Unable to load native-hadoop library for your platform” warning
I assume you’re running Hadoop on 64bit CentOS. The reason you saw that warning is the native Hadoop library $HADOOP_HOME/lib/native/libhadoop.so.1.0.0 was actually compiled on 32 bit. Anyway, it’s just a warning, and won’t impact Hadoop’s functionalities. Here is the way if you do want to eliminate this warning, download the source code of Hadoop and recompile libhadoop.so.1.0.0 on 64bit … Read more
What does regular expression \\s*,\\s* do?
That regex “\\s*,\\s*” means: \s* any number of whitespace characters a comma \s* any number of whitespace characters which will split on commas and consume any spaces either side
Ubuntu: OpenJDK 8 – Unable to locate package
UPDATE: installation without root privileges below I advise you to not install packages manually on ubuntu system if there is already a (semi-official) repository able to solve your problem. Further, use Oracle JDK for development, just to avoid (very sporadic) compatibility issues (i’ve tried many years ago, it’s surely better now). Add the webupd8 repo to your … Read more
How to call a method in another class in Java?
Currently I have two classes. a classroom class and a School class. I would like to write a method in the School class to call public void setTeacherName(String newTeacherName) from the classroom class. classroom.java School.java
Wait for page load in Selenium
How do you make Selenium 2.0 wait for the page to load?