alternatives --install /usr/lib/jvm/jre-1.8.0 jre_1.8.0 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.262.b10-0.el7_8.x86_64/jre 1
alternatives --install <java에서 직접 사용할 링크> </etc/alternatives 에 생성 될 링크 이름> <생성될 링크가 바라볼 실제 프로그램 위치>
java에서 사용될 링크 는 /etc/alternatives/생성될 링크 이름
자바에서 직접 사용할 링크가 -> /etc/alternatives/생성 으로 수정
alternatives --install /usr/bin/jre jre /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.412.b08-2.el8.x86_64/jre/bin/java 1




java
alternatives --install /usr/bin/java java /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.262.b10-0.el7_8.x86_64/bin/java 1
alternatives --set java /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.262.b10-0.el7_8.x86_64/bin/java
jre
alternatives --install /usr/bin/jre java /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.262.b10-0.el7_8.x86_64/jre 1
alternatives --set jre /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.262.b10-0.el7_8.x86_64/jre
jre_1.8.0
alternatives --install /usr/lib/jre_1.8.0 jre-1.8.0 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.262.b10-0.el7_8.x86_64/jre 1
alternatives --set jre_ /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.262.b10-0.el7_8.x86_64/jre
jre_1.8.0_openjdk
alternatives --install /usr/lib/jvm/jre-1.8.0-openjdk jre_1.8.0_openjdk /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.262.b10-0.el7_8.x86_64 1
alternatives --set jre_1.8.0_openjdk /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.262.b10-0.el7_8.x86_64/jre
jre_openjdk
alternatives --install /usr/lib/jvm/jre-openjdk jre_openjdk /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.262.b10-0.el7_8.x86_64/jre 2
alternatives --set jre_openjdk /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.262.b10-0.el7_8.x86_64/jre
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