60 lines
1008 B
Markdown
60 lines
1008 B
Markdown
#Linux
|
|
|
|
- 기존 자바 삭제
|
|
``` Shell
|
|
[root login]
|
|
rpm -qa | grep java
|
|
yum remove [java-1.7.0-openjdk-1.7.0.79-2.5.5.4.el6.x86_64]
|
|
|
|
```
|
|
|
|
- 설치
|
|
``` Shell
|
|
yum install java-1.8.0-openjdk
|
|
|
|
# yum list java*jdk-devel
|
|
# yum install java-1.8.0-openjdk-devel.x86_64
|
|
|
|
# java -version
|
|
|
|
```
|
|
|
|
|
|
- 환경변수 등록
|
|
``` Shell
|
|
readlink -f /usr/bin/java
|
|
> /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.332.b09-1.el7_9.i386/jre/bin/java
|
|
|
|
vi /etc/profile
|
|
|
|
JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.332.b09-1.el7_9.i386
|
|
PATH=$PATH:$JAVA_HOME/bin
|
|
CLASSPATH=$JAVA_HOME/jre/lib:$JAVA_HOME/lib/tools.jar
|
|
|
|
export JAVA_HOME PATH CLASSPATH
|
|
|
|
### 변경사항 적용 ###
|
|
source /etc/profile
|
|
|
|
### 확인 ###
|
|
echo $JAVA_HOME
|
|
echo $PATH
|
|
echo $CLASSPATH
|
|
|
|
```
|
|
|
|
|
|
- HelloWorld.java 컴파일 후 실행 테스트
|
|
``` shell
|
|
vi HelloWorld.java
|
|
public class HelloWorld{
|
|
public static void main(String[] args){
|
|
System.out.println("Hello World!!");
|
|
}
|
|
}
|
|
|
|
javac HelloWorld.java
|
|
java -cp . HelloWorld
|
|
Hello World!!
|
|
```
|