Install the jdk ------- * .tar.gz package on Ubuntu

To install the jdk ------- * .tar.gz package on Ubuntu, first decompress * .tar.gz. the specific method is tar-xzvf * .tar.gz. assume that the folder obtained is java and the command to move it to/usr/is: sudomvjava/usr/then set the environment variable: sudogedit/etc/prof... to install the jdk ------- * .tar.gz package on Ubuntu, first decompress * .tar.gz. the specific method is tar-xzvf * .tar.gz. assume that the folder obtained is java and the command to move it to/usr/is: sudo mv java/usr/and then set the environment variable: sudo gedit/etc/profile before opening the file umask 022 at the end, enter: JAVA_HOME =/usr/java export JRE_HOME =/usr/java/jre export CLASSPATH =.: $ JAVA_HOME/lib : $ JRE_HOME/lib: $ CLASSPATH export PATH = $ JAVA_HOME/bin: $ JRE_HOME/bin: $ PATH modify the default jdk update-alternatives in Ubuntu -- install/usr/bin/java/usr/java/bin/java 300update-alternatives -- install/usr/bin/javac/usr/ java/bin/javac 300 adds the installed jdk to the java menu through this step. Update-alternatives -- config java: Select the default jdk java-version