今天我是刚刚接触到java,现在上大二了,也该开始学点新的东西了.
在大一下半学期我们学的是c,现在学的是c++.我感觉自己把c++已经掌握的可以了,所以准备学点新的东西.
我把jdk下下来后又按照网上说的 路径设置 也弄了但是就是不行呢.运行数 javac 不是内部命令外部命令 也不是可执行程序

我也是今天刚刚接触所以有些不懂,而网上的一些东西说的也是很仔细的.但希望你能给些帮助

D:\program>java -version HelloWorld.java
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)

D:\program>java HelloWorld
Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorld

D:\program>java -version Hello.java
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)

D:\program>java Hello
Exception in thread "main" java.lang.NoClassDefFoundError: Hello

D:\program>

这样是不是成功了啊,我有时候看到有的人写 先运行:javac HelloWorld.java
而又的是些 java -version HelloWorld 呢.

学了c++ 感觉 java不是很难理解,关键是在以后多多接触一些新的东西.
其实今天我还想在图书馆借一些mfc的书,不过没有基本,以后也只有在网上和同学交流,不懂就问了.

我配置完后 运行 java -version 出现

C:\Documents and Settings\Administrator>java -version
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)

C:\Documents and Settings\Administrator>

我想着应该是配置成功了,我的jdk的路径设置也应该是正确的了
运行java出现:
C:\Documents and Settings\Administrator>java
Usage: java [-options] class [args...]
(to execute a class)
or java [-options] -jar jarfile [args...]
(to execute a jar file)

where options include:
-client to select the "client" VM
-server to select the "server" VM
-hotspot is a synonym for the "client" VM [deprecated]
The default VM is client.

-cp <class search path of directories and zip/jar files>
-classpath <class search path of directories and zip/jar files>
A ; separated list of directories, JAR archives,
and ZIP archives to search for class files.
-D<name>=<value>
set a system property
-verbose[:class|gc|jni]
enable verbose output
-version print product version and exit
-version:<value>
require the specified version to run
-showversion print product version and continue
-jre-restrict-search | -jre-no-restrict-search
include/exclude user private JREs in the version search
-? -help print this help message
-X print help on non-standard options
-ea[:<packagename>...|:<classname>]
-enableassertions[:<packagename>...|:<classname>]
enable assertions
-da[:<packagename>...|:<classname>]
-disableassertions[:<packagename>...|:<classname>]
disable assertions
-esa | -enablesystemassertions
enable system assertions
-dsa | -disablesystemassertions
disable system assertions
-agentlib:<libname>[=<options>]
load native agent library <libname>, e.g. -agentlib:hprof
see also, -agentlib:jdwp=help and -agentlib:hprof=help
-agentpath:<pathname>[=<options>]
load native agent library by full pathname
-javaagent:<jarpath>[=<options>]
load Java programming language agent, see java.lang.instrument
我想这也应该是正确的了
但是在运行 javac时 说 javac 即不是内部命令也不是外部命令 也不是可执行文件或批处理文件
这是怎么个问题呢,好像有很多人都不知道

怎么在 bin 下面没有javac.exe文件呢