Android实战技巧之八：Ubuntu下切换JDK版本

标签：ubuntu   java 7   openjdk   jdk   切换jdk版本   

Android L之后推荐使用JDK7编译程序，这是自然发展规律，就像是4年前编译Android 1.6需要使用JDK5一样。

多版本JDK是可以共存的，只需要使用update-alternatives工具就可以随时将它们切换。下面描述安装openjdk和oracle jdk（对不住了sun）以及切换版本的过程。

一、安装openjdk7

$ sudo apt-get update
$ sudo apt-get install openjdk-7-jdk

$ dpkg -L openjdk-7-jdk
/.
/usr
/usr/lib
/usr/lib/jvm
/usr/lib/jvm/java-7-openjdk-amd64

$ ls /usr/lib/jvm/java-7-openjdk-amd64/
ASSEMBLY_EXCEPTION  bin  docs  include  jre  lib  man  src.zip  THIRD_PARTY_README

二、切换java版本

$ sudo 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-6-openjdk-amd64/jre/bin/java   1061      auto mode
  1            /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/java   1061      manual mode
  2            /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java   1051      manual mode

Press enter to keep the current choice[*], or type selection number: 2
update-alternatives: using /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java to provide /usr/bin/java (java) in manual mode.

$ java -version
java version "1.7.0_65"
OpenJDK Runtime Environment (IcedTea 2.5.3) (7u71-2.5.3-0ubuntu0.12.04.1)

三、安装Oracle jdk

$ sudo update-alternatives --install /usr/bin/java java /opt/jdk/jdk1.7.0_71/bin/java 700
$ sudo update-alternatives --install /usr/bin/javac javac /opt/jdk/jdk1.7.0_71/bin/javac 700
$ sudo update-alternatives --install /usr/bin/jar jar /opt/jdk/jdk1.7.0_71/bin/jar 700

$ sudo 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-6-openjdk-amd64/jre/bin/java   1061      auto mode
  1            /opt/jdk/jdk1.7.0_71/bin/java                    700       manual mode
  2            /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/java   1061      manual mode
* 3            /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java   1051      manual mode

Press enter to keep the current choice[*], or type selection number: 1
update-alternatives: using /opt/jdk/jdk1.7.0_71/bin/java to provide /usr/bin/java (java) in manual mode

验证是否切换成功：

$ java -version
java version "1.7.0_71"
Java(TM) SE Runtime Environment (build 1.7.0_71-b14)
Java HotSpot(TM) 64-Bit Server VM (build 24.71-b01, mixed mode)

Android实战技巧之八：Ubuntu下切换JDK版本

标签：ubuntu   java 7   openjdk   jdk   切换jdk版本   

原文地址：http://blog.csdn.net/lincyang/article/details/42024565