Getting started with java development: jdk, jre and environment variable configuration after installation

1. jdk: java development kit, java development, tool kit, for developers, which mainly includes jre, jvm, jdk source package , and the bin folder. For development, some instructions for compiling and running,

2, jre: java runtime environment, java runtime environment, for java users, which mainly includes jvm and java Basic class library at runtime

3. Environment variable configuration: Click Computer→Properties→Advanced System Settings→Advanced→Environment Variables

In the system variables,

3.1 New: JAVA_HOME variable, the variable name is JAVA_HOME, the variable value is the jdk installation directory, such as C:\Program Files\Java\jdk1.8.0_92

3.2 Modification: Path variable, the variable name is Path, Add %JAVA_HOME%\bin; to the beginning of the variable value, or add %JAVA_HOME%\bin; to the end. However, you need to pay attention to whether the last value has a ';' sign. If you do not add it yourself, note that all symbols are It is an English symbol, not a Chinese symbol, and letters recognize upper and lower case

3.3 Check: whether the configuration is successful, win r → enter cmd, and then enter the dos command, enter java -version (if it returns to the java version after running The information indicates that the configuration is successful);

3.4 The purpose of environment variable configuration: In order for the system to find the running path of the program, before setting the environment variable, we can only compile the java file running in the specified directory ( The specified directory seems to be under the jdk installation directory), but after configuring the environment variables, files placed anywhere on the computer can be compiled and run.

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