OpenJDK 17 : インストール2021/09/23 |
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OpenJDK をインストールします。
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| [1] | OpenJDK 17 をインストールします。JRE のみで良い場合は [openjdk-17-jre] を指定します。 |
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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:~#
root@dlp:~# source /etc/profile.d/java.sh
java --version openjdk 17-ea 2021-09-14 OpenJDK Runtime Environment (build 17-ea+19-Debian-1) OpenJDK 64-Bit Server VM (build 17-ea+19-Debian-1, 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] | 複数バージョンをインストールしている場合は [alternatives] で切り替え可能です。 |
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root@dlp:~# update-alternatives --config java
There are 2 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
Press <enter> to keep the current choice[*], or type selection number: 2
root@dlp:~# update-alternatives --config javac
There are 2 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
Press <enter> to keep the current choice[*], or type selection number: 2
root@dlp:~# java --version openjdk 17-ea 2021-09-14 OpenJDK Runtime Environment (build 17-ea+19-Debian-1) OpenJDK 64-Bit Server VM (build 17-ea+19-Debian-1, mixed mode, sharing) |
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