Anyone can be affected by avascular necrosis. However, it's most common in people between the ages of 30 and 60. Because of this relatively young age range, avascular necrosis can have significant long-term consequences. Symptoms.
JDK (Java Development Kit). 1  It is a bundle of software that you can use to develop Java based applications. 2  Java Development Kit is needed for developing java applications. 3  The JDK needs more Disk space as it contains the JRE along with various development tools.
Assuming you are working in Windows environment, checking whether JDK is installed or not is quite simple: 1  Open up command prompt (cmd). 2  Once the command prompt opens up (the typical black screen), type in the command javac. 3  If your command prompt gets flooded with information about files and directories, BINGO!