How to Install Java8 on Ubuntu 14.04

I thought I knew how to do that; I have been using Java for programming for ages. I had Ubuntu 13.10 on an Acer Chromebook C720 until earlier this week, when I made the mistake of installing Ubuntu 14.04, Not only does it load more slowly, but also it gvies errors with Java. I can do this

Quote:

sudo apt-get install openjdk-7-jdk

java -version

...and get the appropriate response 1.7.0_51 IcedTea etc,

but I want to use Java8, so I did what I have always done, something like this

Quote:

cd /usr

sudo mkdir java

sudo chown campbell java

cd java

tar -zxvf ~/Downloads/jdk-8-etc-linux-etc.tar.gz

and got the usual output, a list of files being created. Now if I try to use it, things go wrong.

Quote:

campbell@xxxxx:~/java$ /usr/java/jdk1.8.0_05/bin/java -version

bash: /usr/java/jdk1.8.0_05/bin/java: cannot execute binary file: Exec format error

campbell@xxxxx:~/java$ java -version

java version "1.7.0_51"

OpenJDK Runtime Environment (IcedTea 2.4.6) (7u51-2.4.6-1ubuntu4)

OpenJDK Server VM (build 24.51-b03, mixed mode)

campbell@xxxxx:~/java$ java RussianMultiplication

Usage java RussianMultiplication <123> <456>

Default values 57 43 used

Multiply with * and /

57 * 43 = 2451

Multiply with << and >>

57 * 43 = 2451

campbell@xxxxx:~/java$ /usr/java/jdk1.8.0_05/bin/java RussianMultiplication

bash: /usr/java/jdk1.8.0_05/bin/java: cannot execute binary file: Exec format error

It works all right with OpenJDK but the Oracle version doesn't. Whether it was exactly the same download as last week or a new download, I get that error. Similarly for Oracle Java7

Anybody else ever seen that error? I shall probably revert to Ubuntu 13.10 for the time being.

I have asked the same question here: How to Install Java8 on Ubuntu 14.04 (Beginning Java forum at JavaRanch)

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