Vá até uma pasta livre…

$> cd /opt

Download para OS 32 Bits:

$> wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/8u45-b14/jdk-8u45-linux-i586.rpm"
$> wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/8u45-b14/jre-8u45-linux-i586.rpm"

Download para OS 64 Bits:

$> wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/8u45-b14/jdk-8u45-linux-x64.rpm"
$> wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/8u45-b14/jre-8u45-linux-x64.rpm"

Instalação (via RPM) para o OS 32 Bits:

$> rpm -Uvh jdk-8u45-linux-i586.rpm
$> rpm -Uvh jre-8u45-linux-i586.rpm

Instalação (via RPM) para o OS 64 Bits:

$> rpm -Uvh jdk-8u45-linux-x64.rpm
$> rpm -Uvh jre-8u45-linux-x64.rpm

Só correr para o abraço!

$> java -version

$> javac -version