echo--My first Java learning class

Graduated to now has 12 years, programming language also learned c,vb,vb.net, SAP-ABAP, this year began to learn Java, hope how many can learn something, to their future work is helpful.

One, DOS command

1.rd Delete Files folder

2.md Creating folders

3. Exit the folder CD. /.. /

4. Go to Folder CD

5. A point is the current directory, two points is the parent directory

6. Create a file by way of pipeline

Example 1:echo abc>a.txt

Action: Creates a a.txt with the contents of ABC under the current path

Job one, how to forcibly delete a folder

Example 2:test.bat

@echo off

For%%i inch (a,b,c) do echo%%i

Pause>nul

Direct execution, screen effect:

Job two, Bat script reader to file

Second, Java installation JRE contains JVM JDK Java Development Kit

Common development tools in the Bin directory are Java.exe,jar.exe,java.exe,native2ascii.exe

Installation of JDK Control Panel, system and safety systems

Class hello{

Java's main program, the entrance to the program

public static void Main (String args[]) {

System.out.println ("Hello World");

}

}

Save As Hello.java on the desktop first
Then set the bin directory of the path=jdk1.6 (C:\Users\HP\Desktop\jdk1.8.0_45\bin)
Set Path=c:\users\hp\desktop\jdk1.8.0_45\bin
Re-compiling Javac Hello.java
Execute Java Hello again
You can also create a new script Test2.bat
@echo off
Set path=c:\users\hp\desktop\jdk1.8.0_45\bin;%path%;
Javac Hello.java
Java Hello
Pause>nul
Windows Settings
New user variable, environment variable, System properties, variable name path variable value

echo--My first Java learning class