Ubuntu 22.04
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OpenJDK 17 : インストール
2022/08/29
 
OpenJDK 17 をインストールします。
[1] OpenJDK 17 のインストールと動作確認です。
root@dlp:~#
apt -y install openjdk-17-jdk
root@dlp:~#
cat > /etc/profile.d/java.sh <<'EOF'
export JAVA_HOME=$(dirname $(dirname $(readlink $(readlink $(which java)))))
export PATH=$PATH:$JAVA_HOME/bin
EOF
root@dlp:~#
source /etc/profile.d/java.sh
root@dlp:~#
java --version

openjdk 17.0.4 2022-07-19
OpenJDK Runtime Environment (build 17.0.4+8-Ubuntu-122.04)
OpenJDK 64-Bit Server VM (build 17.0.4+8-Ubuntu-122.04, mixed mode, sharing)

# テストプログラムを作成して動作確認

root@dlp:~# cat > java_test.java <<'EOF'
class java_test {
    public static void main(String[] args) {
        System.out.println("Hello Java World !");
    }
}
EOF 

root@dlp:~#
javac java_test.java

root@dlp:~#
java java_test

Hello Java World !
[2] 公式リポジトリから複数バージョンをインストールしている場合は [update-alternatives] で切り替え可能です。
root@dlp:~#
update-alternatives --config java

There are 3 choices for the alternative java (providing /usr/bin/java).

  Selection    Path                                            Priority   Status
------------------------------------------------------------
* 0            /usr/lib/jvm/java-17-openjdk-amd64/bin/java      1711      auto mode
  1            /usr/lib/jvm/java-11-openjdk-amd64/bin/java      1111      manual mode
  2            /usr/lib/jvm/java-17-openjdk-amd64/bin/java      1711      manual mode
  3            /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java   1081      manual mode

Press <enter> to keep the current choice[*], or type selection number: 0

root@dlp:~#
update-alternatives --config javac

There are 3 choices for the alternative javac (providing /usr/bin/javac).

  Selection    Path                                          Priority   Status
------------------------------------------------------------
* 0            /usr/lib/jvm/java-17-openjdk-amd64/bin/javac   1711      auto mode
  1            /usr/lib/jvm/java-11-openjdk-amd64/bin/javac   1111      manual mode
  2            /usr/lib/jvm/java-17-openjdk-amd64/bin/javac   1711      manual mode
  3            /usr/lib/jvm/java-8-openjdk-amd64/bin/javac    1081      manual mode

Press <enter> to keep the current choice[*], or type selection number: 0

root@dlp:~#
java -version

openjdk version "17.0.4" 2022-07-19
OpenJDK Runtime Environment (build 17.0.4+8-Ubuntu-122.04)
OpenJDK 64-Bit Server VM (build 17.0.4+8-Ubuntu-122.04, mixed mode, sharing)
root@dlp:~#
javac -version

javac 17.0.4
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