Java recently to the study, did not think the environment configured to engage a full four days, Khan! I believe there are many java beginners like me some questions about the configuration of the environment, find something online does not complete, this hope This article can help with java beginners take a good first step! 1. First of all JDK do not say it, since you have to learn java I believe you already know what it is enough, in the sun on the companys Web site available free of charge! download good JDK, we have him step by step installation to our local system, such as installing to: C: Program FilesJava directory, and then is to configure the environment variables, I introduce here only the configuration of the Windows platform! steps are as follows:
Unix development period is the most important period. Ritchie and Thompson in 1969 and 1973 both within the C programming language developed, and the Unix kernel level programming language with C re-write. Unix operating system was able to compile and run on different hardware platforms. spend a few months, written with C on Unix can be ported to new hardware platforms. in the C language with the help modify the operating system has become easier. members of the academic community has begun Many systems design course using Unix, written in C using general-purpose modern command, Unix started out of the limitations of word-processing and editing fields. At this time Unix has grown to the sixth version of a commercial company based on the name of Whitesmiths The sixth edition of Unix released a commercial Unix version called Idris .1975 Thompson visited Berkeley on University equipment installed on the PDP-11/70 Sixth Edition Unix, the two graduate schools at the moment Bill Joy and Chuck Haley and Berkeley is just deal with this version of Unix, They in Berkeley for the Unix development plays an important role in the environment they are in the Sixth Edition Unix was the first item on the ex editor development. They on the Unix operating principle is very interested in the internal , Joy C language to enhance the vi editor, shell, and mix together to form a suite called BSD, first released in 1975, this model in 1978, a second release, the second release added BSD virtual memory support, allows the program to the physical memory size in the case of not enough and continue to simulate the virtual memory to be used. This particular idea seventh edition of Bell Labs Unix effect is very large, Seventh Edition The final version of Unix is entirely original Bell Labs Unix distribution. After the Unix version of the function of content from a number of commercial companies and university research institutions to add more or less .70 late U.S. Defense Advanced Research Project Board decided to build its common computing environment on top of the Berkeley version of Unix, the BSD version 4.1, based on the Defense Advanced Research Projects Agency was important for the 4.1BSD performance tuning upgrade, providing a fast file system improves system performance prevents the generation of file fragmentation, the file system is added to the 4.2 version of the BSD software system.