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This article introduces the relevant knowledge of "the method of installing java in Ubuntu14.04". Many people will encounter such a dilemma in the operation of actual cases, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

JRE vs OpenJDK vs Oracle JDK

Before we move on to how to install Java, let's quickly understand the differences between JRE, OpenJDK, and Oracle JDK.

JRE (Java Runtime Environment), which is the environment you normally need to run an application based on the Java language. If you are not a programmer, this is enough for your needs.

JDK stands for Java development kit, and if you want to do some development (reading programs) about Java, this is exactly what you need.

OpenJDK is an open source implementation of the Java development kit, and Oracle JDK is the official Oracle version of the Java development kit. Although OpenJDK is sufficient for most cases, many programs such as Android Studio recommend using Oracle JDK to avoid UI/ performance problems.

Check to see if Java is installed on Ubuntu

Open the terminal and use the following command:

Java-version

If you see output like this, it means you don't have Java installed:

The program 'java' can be found in the following packages:

* default-jre

* gcj-4.6-jre-headless

* openjdk-6-jre-headless

* gcj-4.5-jre-headless

* openjdk-7-jre-headless

Try: sudo apt-get install

Install Java on Ubuntu and Linux Mint

After looking at the differences between the various types of 'Java', let's see how to install them.

Install JRE on Ubuntu and Linux Mint

Open the terminal and install JRE using the following command:

Sudo apt-get install default-jre

Install OpenJDK on Ubuntu and Linux Mint

On the terminal, install the OpenJDK Java SDK using the following command:

Sudo apt-get install default-jdk

In particular, if you want to install Java 7 or Java 6, you can use openjdk-7-jdk/openjdk-6jdk, but remember to install openjdk-7-jre/openjdk-6-jre before that.

Install Oracle JDK on Ubuntu and Linux Mint

Use the following command to install, it only takes some time, it will download a lot of files, so you need to make sure your network environment is good:

Sudo add-apt-repository ppa:webupd8team/java

Sudo apt-get update

Sudo apt-get install oracle-java8-installer

Sudo apt-get install oracle-java8-set-default

If you want to install Java 7 (i.e Java 1.7), use java7 instead of java8 in the above command.

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