我的java版本正常吗？（已解决)

[dida]

java --version
java version "1.4.2"
gij (GNU libgcj) version 4.1.0 (Ubuntu 4.1.0-1ubuntu8)

上面提示java版本是1.4.2

sudo apt-get install sun-j2re1.5
正在读取软件包列表... 完成
正在分析软件包的依赖关系树... 完成
sun-j2re1.5 已经是最新的版本了。
共升级了 0 个软件包，新安装了 0 个软件包，要卸载 0 个软件包，有 1 个软件未被升级。

这里是1.5

请问我的java版本正常吗?我的java不是从官方的源获得的
谢谢

[leal]

那个是 gcc里的版本吧

这是 sun java 显示的版本信息

java version "1.5.0_06"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-b05)
Java HotSpot(TM) Client VM (build 1.5.0_06-b05, mixed mode, sharing)

[dida]

怎么显示sun java的版本信息吗？不好意思，真的不懂

[oneleaf]

sudo update-alternatives --config java

在显示的屏幕上出现
1 /usr/bin/gij-wrapper-4.0
*+ 2 /usr/lib/jvm/java-gcj/bin/java
3 /usr/lib/j2sdk1.5-sun/bin/java

选择 3

[dida]

谢谢oneleaf，我这儿有这样的提示：
sudo update-alternatives --config java

There are 4 alternatives which provide `java'.

Selection Alternative
-----------------------------------------------
+ 1 /usr/lib/jvm/java-gcj/bin/java
* 2 /usr/lib/j2re1.5-sun/bin/java
3 /usr/bin/gij-wrapper-4.1
4 /etc/alternatives/kaffe-system/bin/java

我应该怎么做呢？好象没有sdk字样

[oneleaf]

* 2 /usr/lib/j2re1.5-sun/bin/java

[dida]

再谢oneleaf，选2后
~$ java --version
Unrecognized option: --version
Could not create the Java virtual machine.

[zhan]

help了一下，发现是这样
java -version，只有一条短横线

[dida]

这么笨的问题我也没解决......
再度谢谢oneleaf和zhan~

[arden]

Java Installation
This page provides steps to install Java SDK 1.5

Download the most recent version of JDK (without NetBeans or J2EE) from java.sun.com. Select the Linux RPM in self-extracting file.

Make the downloaded file executable, and then run it:
chmod +x jdk-1_5_0_06-linux-i586-rpm.bin
./jdk-1_5_0_06-linux-i586-rpm.bin
Press space bar to view the copyright terms, and at the end, type in yes to agree to the terms.
Scripts stored in /etc/profile.d are called as a part of initialization when a new shell is created. We will use this procedure to set two important environmental variables related to java. Create /etc/profile.d/java.sh with the following contents. (Correct the pathname to match your version of java.)
export JAVA_HOME=/usr/java/jdk1.5.0_06
export PATH=${JAVA_HOME}/bin:${PATH}
Make the script executable.
chmod +x /etc/profile.d/java.sh