Steps to install java oracle in debian

install java on debian

//Download <jdk-version>.tar.gz
cd Downloads // go to downloads folder
tar -xvf <jdk-version>.tar.gz // decompress

sudo mkdir -p /usr/lib/jvm/<jdk-version> // create location directory
sudo mv <jdk-version>/* /usr/lib/jvm/my-jdk-version/

sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/my-jdk-version/bin/java" 1 // install jre
sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/my-jdk-version/bin/javac" 1 // install compiler
sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/lib/jvm/my-jdk-version/bin/javaws" 1 // install java web start

// if we have many java's versiones installed
sudo update-alternatives --config java // choice the bootstrap priority 
// already, it's all

*Note: replace <jdk-version> for the filename you downloaded

don't forgot replace for the filename you downloaded