关于JDK Posted on 2017-09-01 | In Java | Visitors openjdk和oracle-java 1234# openjdk-8-jdk, openjdk-8-jdk-headless, openjdk-8-jre, openjdk-8-jre-headless $ sudo apt install openjdk # oracle-java8 $ sudo apt install oracle-java 安装后： 1234567angi@angi-deepin:/usr/lib/jvm$ ls -l 总用量 8 lrwxrwxrwx 1 root root 24 1月 6 2017 default-java -> java-1.8.0-openjdk-amd64 lrwxrwxrwx 1 root root 20 11月 3 2016 java-1.8.0-openjdk-amd64 -> java-8-openjdk-amd64 drwxr-xr-x 7 root root 4096 9月 1 09:21 java-8-openjdk-amd64 drwxr-xr-x 8 root root 4096 9月 1 14:33 java-8-oracle angi@angi-deepin:/usr/lib/jvm$ java -version结果： 123456789angi@angi-deepin:/usr/lib/jvm$ java-8-oracle/bin/java -version java version "1.8.0_144" Java(TM) SE Runtime Environment (build 1.8.0_144-b01) Java HotSpot(TM) 64-Bit Server VM (build 25.144-b01, mixed mode) angi@angi-deepin:/usr/lib/jvm$ java-8-openjdk-amd64/bin/java -version openjdk version "1.8.0_141" OpenJDK Runtime Environment (build 1.8.0_141-8u141-b15-3-b15) OpenJDK 64-Bit Server VM (build 25.141-b15, mixed mode) angi@angi-deepin:/usr/lib/jvm$ 12345678910111213141516171819202122232425262728angi@angi-deepin:/etc/alternatives$ which java /usr/bin/java angi@angi-deepin:/usr/bin$ ls -l |grep java lrwxrwxrwx 1 root root 22 9月 1 14:33 java -> /etc/alternatives/java lrwxrwxrwx 1 root root 23 9月 1 09:21 javac -> /etc/alternatives/javac lrwxrwxrwx 1 root root 25 9月 1 09:21 javadoc -> /etc/alternatives/javadoc lrwxrwxrwx 1 root root 23 9月 1 09:21 javah -> /etc/alternatives/javah lrwxrwxrwx 1 root root 23 9月 1 09:21 javap -> /etc/alternatives/javap lrwxrwxrwx 1 root root 24 9月 1 09:58 javaws -> /etc/alternatives/javaws angi@angi-deepin:/etc/alternatives$ ls -l |grep java ... lrwxrwxrwx 1 root root 41 9月 1 09:21 jar -> /usr/lib/jvm/java-8-openjdk-amd64/bin/jar lrwxrwxrwx 1 root root 51 9月 1 09:21 jar.1.gz -> /usr/lib/jvm/java-8-openjdk-amd64/man/man1/jar.1.gz lrwxrwxrwx 1 root root 47 9月 1 09:21 jarsigner -> /usr/lib/jvm/java-8-openjdk-amd64/bin/jarsigner lrwxrwxrwx 1 root root 57 9月 1 09:21 jarsigner.1.gz -> /usr/lib/jvm/java-8-openjdk-amd64/man/man1/jarsigner.1.gz lrwxrwxrwx 1 root root 46 9月 1 14:33 java -> /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java lrwxrwxrwx 1 root root 56 9月 1 14:33 java.1.gz -> /usr/lib/jvm/java-8-openjdk-amd64/jre/man/man1/java.1.gz lrwxrwxrwx 1 root root 43 9月 1 09:21 javac -> /usr/lib/jvm/java-8-openjdk-amd64/bin/javac lrwxrwxrwx 1 root root 53 9月 1 09:21 javac.1.gz -> /usr/lib/jvm/java-8-openjdk-amd64/man/man1/javac.1.gz lrwxrwxrwx 1 root root 45 9月 1 09:21 javadoc -> /usr/lib/jvm/java-8-openjdk-amd64/bin/javadoc lrwxrwxrwx 1 root root 55 9月 1 09:21 javadoc.1.gz -> /usr/lib/jvm/java-8-openjdk-amd64/man/man1/javadoc.1.gz lrwxrwxrwx 1 root root 43 9月 1 09:21 javah -> /usr/lib/jvm/java-8-openjdk-amd64/bin/javah lrwxrwxrwx 1 root root 53 9月 1 09:21 javah.1.gz -> /usr/lib/jvm/java-8-openjdk-amd64/man/man1/javah.1.gz lrwxrwxrwx 1 root root 43 9月 1 09:21 javap -> /usr/lib/jvm/java-8-openjdk-amd64/bin/javap lrwxrwxrwx 1 root root 53 9月 1 09:21 javap.1.gz -> /usr/lib/jvm/java-8-openjdk-amd64/man/man1/javap.1.gz lrwxrwxrwx 1 root root 48 9月 1 09:58 javaws -> /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/javaws lrwxrwxrwx 1 root root 58 9月 1 09:58 javaws.1.gz -> /usr/lib/jvm/java-8-openjdk-amd64/jre/man/man1/javaws.1.gz ... 切换JDK 12345678910$ sudo update-alternatives --config java 有 2 个候选项可用于替换 java (提供 /usr/bin/java)。 选择 路径 优先级 状态 ------------------------------------------------------------ * 0 /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java 1081 自动模式 1 /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java 1081 手动模式 2 /usr/lib/jvm/java-8-oracle/jre/bin/java 80 手动模式 要维持当前值[*]请按<回车键>，或者键入选择的编号： IBM JDK IBM JDK