Java cannot be installed

Java cannot be installed-General Linux technology-Linux technology and application information. The following is a detailed description. Example:
New linux is struggling!
Install the java plug-in for your work and download it to java.com/download.
Follow the prompts to switch to the required installation directory. Type:
Cd <Directory path name>
For example, to install software in the/usr/java/directory, type:
Cd/usr/java/

About super user access permissions: to install Java in a system-level location (for example,/usr/local), you must log on as a super user to obtain the necessary permissions. If you do not have the superuser access permission, install Java in your home directory or in a subdirectory with the write permission.
Move the binary file of the .tar.gz file to the current directory.
Decompress the tarball and install Java
Tar zxvf jre-7u7-linux-x64.tar.gz

The Java file will be installed in the jre1.7.0 _ 7 directory in the current directory. In this example, Java will be installed in the/usr/java/jre1.7.0 _ 7 directory.
Note: the file name has been changed as needed. However, the installation was not successful!
Please advise me if you don't want to get into the stream!