Java Install

1. at Ubuntu Linux

sudo update-alternatives --config java

sudo update-java-alternatives -l

java-1.17.0-openjdk-amd64      1711       /usr/lib/jvm/java-1.17.0-openjdk-amd64
java-8-oracle                  1081       /usr/lib/jvm/java-8-oracle

sudo update-java-alternatives -s java-8-oracle
sudo update-java-alternatives -s java-1.17.0-openjdk-amd64

sudo add-apt-repository ppa:openjdk-r/ppa
sudo apt-get update
sudo apt-get install openjdk-17-jdk

sudo apt-get update
sudo apt-get install openjdk-8-jdk

~~매번 까먹는다. 서버에는 Sun Java를 설치하도록 한다.~~ 세월이 많이 바뀌었다. 그냥 #OpenJDK 쓰기로 한다. 아래는 무시.

준비 - sudo apt-get install software-proprieties-common or sudo apt-get install python-software-properties
Add repository
```
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
```
install - 설치하고 싶은 버전을 실행
```
sudo apt-get install oracle-java6-installer
sudo apt-get install oracle-java7-installer
sudo apt-get install oracle-java8-installer
```
기본 Java Version 변경

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