java 在 linux 中不工作。为什么?

java is not working in linux. Why?

目前正在 Linux Cinnamon。我的本地驱动器有 unistall/removed Open JDK。然后我通过终端检查 java -version 并给出 -

$ java -version
The program 'java' can be found in the following packages:
 * default-jre
 * gcj-5-jre-headless
 * openjdk-8-jre-headless
 * gcj-4.8-jre-headless
 * gcj-4.9-jre-headless
 * openjdk-9-jre-headless
Try: sudo apt install <selected package>

之后按照安装指南为 linux 安装 oracle jdk 8。然后我通过 [I just unpack jdk to /opt/java]-

检查了 java -version 命令
$ /opt/java/jdk1.8.0_112/bin/java -version
java version "1.8.0_112"
Java(TM) SE Runtime Environment (build 1.8.0_112-b15)
Java HotSpot(TM) 64-Bit Server VM (build 25.112-b15, mixed mode)

我使用 nano 将我的环境变量 JAVA_HOME="/opt/java/jdk1.8.0_112" [不包括 bin] 设置为 /etc/environment from JAVA_HOME setup tutorial -

# Java Home
JAVA_HOME="/opt/java/jdk1.8.0_112"
export JAVA_HOME

并刷新并检查我的 JAVA_HOME 如下 -

$ echo $JAVA_HOME
/opt/java/jdk1.8.0_112

在我尝试通过命令检查 java -version 时进行这些设置后,它给出 -

$ java -version
The program 'java' can be found in the following packages:
 * default-jre
 * gcj-5-jre-headless
 * openjdk-8-jre-headless
 * gcj-4.8-jre-headless
 * gcj-4.9-jre-headless
 * openjdk-9-jre-headless
Try: sudo apt install <selected package>

谁能告诉我这是怎么回事?

即使您设置了 $JAVA_HOME,您仍然需要将 bin 添加到您的 $PATH:

export PATH="$PATH:$JAVA_HOME/bin"