在Eclipse中编译任何java代码的麻烦 [英] Trouble compiling any java code in Eclipse

问题描述

我是java的世界的新手，并且一直在跟踪一些在线教程来开始使用。一切都很好，程序正在完美编译，然后突然间，没有我似乎在改变任何东西，只要偏好直接归因于Eclipse，它就停止编译任何代码。即使是简单的Hello World代码也不会编译。所有我在控制台行中的任何代码是：

 用法：javaw [-options] class [args ...] 
（执行一个类）
或javaw [-options] -jar jarfile [args ...] 
（执行一个jar文件）
其中选项包括：
 -d32使用32位数据模型（如果可用）
 -d64使用64位数据模型（如果可用）
 -server选择服务器VM 
 -hotspot是同义词对于服务器VM [已弃用] 
默认的VM是服务器。 
 
 -cp<目录和zip / jar文件的类搜索路径> 
 -classpath<目录和zip / jar文件的类搜索路径> 
 A;目录分离列表，JAR存档，
和ZIP存档来搜索类文件。 
 -D< name> =< value> 
设置系统属性
 -verbose [：class | gc | jni] 
启用详细输出
 -version打印产品版本并退出
 -version：< value> ; 
要求指定的版本运行
 -showversion打印产品版本并继续
 -jre-restrict-search | -no-jre-restrict-search 
在版本搜索中包含/排除用户私有JRE 
  - ？ -help打印此帮助消息
 -X在非标准选项上打印帮助
 -ea [：< packagename> ... |：< classname>] 
 -enableassertions [：< ; packagename> ... |：< classname>] 
启用具有指定粒度的断言
 -da [：< packagename> ... |：< classname>] 
 -disableassertions [：< packagename> ... |：< classname>] 
禁用具有指定粒度的断言
 -esa | -enablesystemassertions 
启用系统断言
 -dsa | -disablesystemassertions 
禁用系统断言
 -agentlib：< libname> [=< options>] 
加载本机代理库< libname> -agentlib：hprof 
另请参见：-agentlib：jdwp = help和-agentlib：hprof = help 
 -agentpath：< pathname> [=< options>] 
加载本机代理库通过完整路径名
 -javaagent：< jarpath> [=< options>] 
加载Java编程语言代理，请参阅java.lang.instrument 
 -splash：< imagepath> 
显示具有指定图像的初始屏幕
  

请参阅 http://www.oracle.com/technetwork/java/javase/documentation/index.html 了解更多细节。

我不太清楚这是什么，或者为什么开始这样做。修改编译器如何继续学习？

解决方案

这是因为您没有安装JDK但只有JR​​E。安装JDK以使其正常工作。

源

I'm new to the world of java and have been following a few online tutorials to get started. Everything was going great and the programs were compiling perfectly and then all of a sudden, without me seemingly changing anything, as far as preferences directly attributing to Eclipse, it stopped compiling any code at all. Even the simple Hello World code will not compile. All I get in the console line for any code is:

Usage: javaw [-options] class [args...]
       (to execute a class)
or  javaw [-options] -jar jarfile [args...]
       (to execute a jar file)
where options include:
-d32      use a 32-bit data model if available
-d64      use a 64-bit data model if available
-server   to select the "server" VM
-hotspot      is a synonym for the "server" VM  [deprecated]
              The default VM is server.

-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 | -no-jre-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 with specified granularity
-da[:<packagename>...|:<classname>]
-disableassertions[:<packagename>...|:<classname>]
              disable assertions with specified granularity
-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
-splash:<imagepath>
              show splash screen with specified image

See http://www.oracle.com/technetwork/java/javase/documentation/index.html for more details.

I'm not exactly sure of what this is or why it started doing it. How do I go about in fixing the compiler so I can continue to learn?

解决方案

That happens because you haven't installed JDK but only JRE. Install JDK to make it work.

Source

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