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