centos7 java 설치하기

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Centos7 java 설치하기

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1. 설치

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1. jdk 확인

• yum list java*jdk-devel

  [root@noel home]# yum list java*jdk-devel
  Loaded plugins: fastestmirror
  Loading mirror speeds from cached hostfile
  * base: mirror.kakao.com
  * extras: mirror.kakao.com
  * updates: mirror.kakao.com
  Installed Packages
  java-1.8.0-openjdk-devel.x86_64     1:1.8.0.252.b09-2.el7_8       @updates
  Available Packages
  java-1.6.0-openjdk-devel.x86_64     1:1.6.0.41-1.13.13.1.el7_3    base
  java-1.7.0-openjdk-devel.x86_64     1:1.7.0.261-2.6.22.2.el7_8    updates
  java-1.8.0-openjdk-devel.i686       1:1.8.0.252.b09-2.el7_8       updates
  java-11-openjdk-devel.i686          1:11.0.7.10-4.el7_8           updates
  java-11-openjdk-devel.x86_64        1:11.0.7.10-4.el7_8           updates
  [root@noel home]#

  2. 설치

• yum install -y java-1.8.0-openjdk-devl.x86_64

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2. 환경변수 설정

1. javac 심볼릭링크 위치 확인

• which javac

  [root@noel home]# which javac
  /usr/bin/javac

  2. javac 원본파일 위치 확인

• readlink -f /usr/bin/javac

  [root@noel home]# readlink -f /usr/bin/javac
  /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.252.b09-2.el7_8.x86_64/bin/javac

  3. profile 에 환경변수 설정

• vi /etc/profile

  export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.252.b09-2.el7_8.x86_64

  4. 수정된 내용 적용

• source /etc/profile

  5. 환경변수 설정 확인

• echo $JAVA_HOME

  [root@noel home]# echo $JAVA_HOME
  /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.252.b09-2.el7_8.x86_64

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3. 테스트

1. 클래스 생성

• vim Hello.java

  public class Hello {
      public static void main(String[] args) {
          System.out.println("hello test");
      }
  }

  2. 컴파일

• javac Hello.java

  [root@noel home]# ls
  Hello.class  Hello.java

  3. 실행

• java Hello

  [root@noel home]# java Hello
  hello test

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