Loading and unloading switch of JDK under Linux

installation package for Linux under JDK:

A). Bin Package (Jdk-6u45-linux-i586-rpm.bin)

b). tar.gz Bag (jdk-8u144-linux-i586.tar.gz)

c). RPM Package (jdk-7u80-linux-i586.rpm)

2.Linux installation of the JDK:

A). bin package:

Only jdk-6u45-linux-i586-rpm.bin files under the initial folder:

[email protected] jdk-6u45]# LL

Total dosage 67036

-rwxr-xr-x. 1 root root 68637258 July 15:11 jdk-6u45-linux-i586-rpm.bin

assigning permissions to the. bin file for execution

[Email protected] jdk-6u45]# chmod +x jdk-6u45-linux-i586-rpm.bin

9

Execute the. bin file

[Email protected] jdk-6u45]#./jdk-6u45-linux-i586-rpm.bin

Unpacking ...

Checksumming ...

Extracting ...

Unzipsfx 5.50 of February 2002, by Info-zip ([email protected]).

inflating:jdk-6u45-linux-i586.rpm

inflating:sun-javadb-common-10.6.2-1.1.i386.rpm

inflating:sun-javadb-core-10.6.2-1.1.i386.rpm

inflating:sun-javadb-client-10.6.2-1.1.i386.rpm

inflating:sun-javadb-demo-10.6.2-1.1.i386.rpm

inflating:sun-javadb-docs-10.6.2-1.1.i386.rpm

inflating:sun-javadb-javadoc-10.6.2-1.1.i386.rpm

Preparing ... ########################################### [100%]

1:JDK ########################################### [100%]

Unpacking JAR files ...

rt.jar...jsse.jar...charsets.jar...tools.jar...localedata.jar...plugin.jar...javaws.jar...deploy.jar...

Done.

[Email protected] jdk-6u45]#

Files under current folder:

[email protected] jdk-6u45]# LL

Total dosage 134524

-rw-r--r--. 1 root root 58463270 March jdk-6u45-linux-i586.rpm

-rwxr-xr-x. 1 root root 68637258 July 15:11 jdk-6u45-linux-i586-rpm.bin

-rw-r--r--. 1 root root 499375 November 3 sun-javadb-client-10.6.2-1.1.i386.rpm

-rw-r--r--. 1 root root 14627 November 3 sun-javadb-common-10.6.2-1.1.i386.rpm

-rw-r--r--. 1 root root 4080625 November 3 sun-javadb-core-10.6.2-1.1.i386.rpm

-rw-r--r--. 1 root root 969861 November 3 sun-javadb-demo-10.6.2-1.1.i386.rpm

-rw-r--r--. 1 root root 4865183 November 3 sun-javadb-docs-10.6.2-1.1.i386.rpm

-rw-r--r--. 1 root root 201273 November 3 sun-javadb-javadoc-10.6.2-1.1.i386.rpm

[Email protected] jdk-6u45]#

After execution, the Java directory is automatically generated in the/usr/directory, and the JDK information is included in the Java directory. Finally, you can modify the/etc/profile file.

[Email protected] java]# Vim/etc/profile

After entering the file, add the Java_home,classpath,path configuration.

Export java_home=/usr/java/jdk1.6.0_45

Export classpath= $CLASSPATH: $JAVA _home/lib: $JAVA _home/jre/lib

Export path= $JAVA _home/bin: $JAVA _home/jre/bin: $PATH: $HOME/bin

After saving the exit file, execute the command to make the file effective

[Email protected] java]# Source/etc/profile

b). tar.gz bag

Unzip the. tar.gz file:

[Email protected] jdk-8u144]# TAR-ZXVF jdk-8u144-linux-i586.tar.gz

The extracted files are moved to/usr/java/:

[Email protected] jdk-8u144]# MV jdk1.8.0_144//usr/java/

Modify the/etc/profile file, configure the environment variables, add the Java_home,classpath,path path, make the file effective, ibid.

Note: If the Java directory does not exist under the/usr directory, the Java directory will be created automatically using the MV jdk1.8.0_144//usr/java/command, but there will be no jdk1.8.0_144/directory, just jdk1.8.0_ The files in the 144 directory are moved to the/usr/java/directory, and if a Java directory exists before the command is used, the jdk1.8.0_144/directory is moved to the/usr/java/directory as a whole.

c). RPM Package

When installing the JDK using the. bin package, the command will produce a. rpm file that can be used as an installation file or downloaded from Oracle.

Initial contains. rpm Package Files:

[email protected] jdk-7u80]# LL

Total dosage 133572

-rw-r--r--. 1 root root 136775360 July 19:29 jdk-7u80-linux-i586.rpm

Installing using the RPM command

[Email protected] jdk-7u80]# RPM-IVH jdk-7u80-linux-i586.rpm

Preparing ... ########################################### [100%]

1:JDK ########################################### [100%]

Unpacking JAR files ...

rt.jar...jsse.jar...charsets.jar...tools.jar...localedata.jar...jfxrt.jar...plugin.jar...javaws.jar...deploy.jar...

[Email protected] jdk-7u80]#

The current folder does not produce new files

[email protected] jdk-7u80]# LL

Total dosage 133572

-rw-r--r--. 1 root root 136775360 July 19:29 jdk-7u80-linux-i586.rpm

As with the. bin package installation, after executing the command, the Java directory is automatically created under the/usr/directory, the JDK information is placed in the JDK directory, and the configuration Java_home,classpath,path is configured in/etc/profile.

If you use the RPM-IVH jdk-7u80-linux-i586.rpm command to install the RPM should not be used directly install RPM packages, using Alien instead! this error, perform The following commands can:

RPM-IVH jdk-6u22-linux-i586.rpm--nodeps--force.

3. Uninstallation of the JDK under Linux:

A). bin package installation and. RPM Package installed JDK Uninstall:

First look at the currently installed JDK information:

[Email protected] jdk-7u80]# Rpm-qa | grep JDK

jdk-1.7.0_80-fcs.i586

[Email protected] jdk-7u80]#

To uninstall the installed JDK:

[Email protected] jdk-7u80]# rpm-e--nodeps jdk-1.7.0_80-fcs.i586

b). tar.gz Package installed JDK Uninstall:

Remove the unpacked installation package directly.

1 entering the/usr/java directory 2

[Email protected] java]# cd/usr/java/

Delete the extracted JDK files 5[[email protected] java]# RM-RF jdk1.8.0_144/

c) Uninstallation of the system's own JDK:

To view your own JDK:

[Email protected]/]# Rpm-qa | grep JDK

Or:

[Email protected]/]# Rpm-qa | grep GCJ

Results may be obtained:

jdk-1.7.0_80-fcs.i586

Unloading:

[Email protected]/]# rpm-e–nodeps jdk-1.7.0_80-fcs.i586

Or:

[Email protected]/]# ryum-y Remove jdk-1.7.0_80-fcs.i586

Loading and unloading switch of JDK under Linux