1. System Software: Direct and software (operating system) hardware interaction such as Windows 10, Linux
2. Applications: usually line system software, such as QQ software on the system
3. Software Development: generally refers to the use of computer programming language complete application software development
common Dos command
- exit to exit the current window
- cls clear screen
- Dos how to copy the contents:
anywhere in Dos right-click, and then select the mark,
next select the copy content, click the mouse in the Dos window right copying is completed.
- dir List all the subfolders in the current directory
- cd command indicates that: the directory change
- cd .. back to the parent directory
- cd directly back to the root directory
- d: cut the transport disc
solve Dos commands unavailable, windows operating how the system searches the hard drive on a command it?
1. First will search from the current directory
2. When a directory search is not the case, from the environment variable path specified location among the search command
3. If you can not search the above error
so configure the environment variables, dedicated to guiding the Windows operating system
java program loading and execution of
the JVM .class files interpreted bytecode into binary data, then the operating system and the underlying hardware platform execution binary interaction.
JDK java development kit
jdk / bin directory: hold a lot of commands available in the directory, for example: javac.exe responsible for compiling, java.exe is responsible for the implementation of
JRE java runtime environment
* JVM java virtual machine
- switch selection structure must have a default clause, select the variable switch before entering switch to do the inspection process,
or you do not care unforeseen circumstances, then, default is not required.
However, as a unified convention and safety codes, recommendations plus the default statement. switch - if there is no break statement after case behind the case, then the corresponding case statement is executed, it will execute the statement following the statement until the break will jump out
summarize
This week learning a new high-level assembly language is a bit of freshness, because there is fresh so I took much interest in this course, school seriously than before
, a good learning state. The teacher is also quite passionate, lectures significantly more people than in the past a lot, me, now up to engage in learning, knowledge points to get
clear, appropriate training turned a deaf ear to this time, the school is not small after something to feed themselves. Well Java language, there are still a lot of c language similar to the
place, to learn not tired, plus filling it, you will learn Oh! ! ! ! !