javac命令详解（下）

摘自http://blog.csdn.net/hudashi/article/details/7058999

javac命令详解（下）                          

 

-verbose

冗长输出。开启该参数，你将看到编译器编译java源码的详细过程。

比如，示例13：

D:\project\test>javac -cp lib\Util.zip -sourcepath src -verbose -d classes src\c

om\robin\*.java

[parsing started src\com\robin\Hello.java]

[parsing completed 31ms]

[parsing started src\com\robin\People.java]

[parsing completed 0ms]

[search path for source files: src]

[search path for class files: C:\jdk1.6.0\jre\lib\resources.jar,C:\jdk1.6.0\jre\

lib\rt.jar,C:\jdk1.6.0\jre\lib\sunrsasign.jar,C:\jdk1.6.0\jre\lib\jsse.jar,C:\jd

k1.6.0\jre\lib\jce.jar,C:\jdk1.6.0\jre\lib\charsets.jar,C:\jdk1.6.0\jre\classes,

C:\jdk1.6.0\jre\lib\ext\dnsns.jar,C:\jdk1.6.0\jre\lib\ext\localedata.jar,C:\jdk1

.6.0\jre\lib\ext\sunjce_provider.jar,C:\jdk1.6.0\jre\lib\ext\sunmscapi.jar,C:\jd

k1.6.0\jre\lib\ext\sunpkcs11.jar,lib\Util.zip]

[loading src\com\hubin\Util.java]

[parsing started src\com\hubin\Util.java]

[parsing completed 0ms]

[loading java\lang\Object.class(java\lang:Object.class)]

[loading java\lang\String.class(java\lang:String.class)]

[checking com.robin.Hello]

[loading java\lang\Thread.class(java\lang:Thread.class)]

[wrote classes\com\robin\Hello.class]

[checking com.robin.People]

[wrote classes\com\robin\People.class]

[checking com.hubin.Util]

[wrote classes\com\hubin\Util.class]

[total 578ms]

D:\project\test>javac -cp lib\Util.zip -sourcepath src -verbose -d classes src\com\robin\*.java

[parsing started src\com\robin\Hello.java]

[parsing completed 16ms]

[parsing started src\com\robin\People.java]

[parsing completed 0ms]

[search path for source files: src]

[search path for class files: C:\jdk1.6.0\jre\lib\resources.jar,C:\jdk1.6.0\jre\

lib\rt.jar,C:\jdk1.6.0\jre\lib\sunrsasign.jar,C:\jdk1.6.0\jre\lib\jsse.jar,C:\jd

k1.6.0\jre\lib\jce.jar,C:\jdk1.6.0\jre\lib\charsets.jar,C:\jdk1.6.0\jre\classes,

C:\jdk1.6.0\jre\lib\ext\dnsns.jar,C:\jdk1.6.0\jre\lib\ext\localedata.jar,C:\jdk1

.6.0\jre\lib\ext\sunjce_provider.jar,C:\jdk1.6.0\jre\lib\ext\sunmscapi.jar,C:\jd

k1.6.0\jre\lib\ext\sunpkcs11.jar,lib\Util.zip]

[loading src\com\hubin\Util.java]

[parsing started src\com\hubin\Util.java]

[parsing completed 0ms]

[loading java\lang\Object.class(java\lang:Object.class)]

[loading java\lang\String.class(java\lang:String.class)]

[checking com.robin.Hello]

[wrote classes\com\robin\Hello.class]

[checking com.robin.People]

[wrote classes\com\robin\People.class]

[checking com.hubin.Util]

[wrote classes\com\hubin\Util.class]

[total 172ms]

D:\project\test>javac -cp lib-classes -sourcepath src -verbose -d classes src\com\robin\*.java

[parsing started src\com\robin\Hello.java]

[parsing completed 47ms]

[parsing started src\com\robin\People.java]

[parsing completed 0ms]

[search path for source files: src]

[search path for class files: C:\jdk1.6.0\jre\lib\resources.jar,C:\jdk1.6.0\jre\

lib\rt.jar,C:\jdk1.6.0\jre\lib\sunrsasign.jar,C:\jdk1.6.0\jre\lib\jsse.jar,C:\jd

k1.6.0\jre\lib\jce.jar,C:\jdk1.6.0\jre\lib\charsets.jar,C:\jdk1.6.0\jre\classes,

C:\jdk1.6.0\jre\lib\ext\dnsns.jar,C:\jdk1.6.0\jre\lib\ext\localedata.jar,C:\jdk1

.6.0\jre\lib\ext\sunjce_provider.jar,C:\jdk1.6.0\jre\lib\ext\sunmscapi.jar,C:\jd

k1.6.0\jre\lib\ext\sunpkcs11.jar,lib-classes]

[loading lib-classes\com\hubin\Util.class]

[loading java\lang\Object.class(java\lang:Object.class)]

[loading java\lang\String.class(java\lang:String.class)]

[checking com.robin.Hello]

[wrote classes\com\robin\Hello.class]

[checking com.robin.People]

[wrote classes\com\robin\People.class]

[total 656ms]

非标准选项

-X

使用该参数，可以显示所有的非标准选项的有关信息。

示例14：

C:\Documents and Settings\hubin>javac -X

  -Xlint                     Enable recommended warnings

  -Xlint:{all,cast,deprecation,divzero,empty,unchecked,fallthrough,path,serial,f

inally,overrides,-cast,-deprecation,-divzero,-empty,-unchecked,-fallthrough,-pat

h,-serial,-finally,-overrides,none}Enable or disable specific warnings

  -Xbootclasspath/p:<path>   Prepend to the bootstrap class path

  -Xbootclasspath/a:<path>   Append to the bootstrap class path

  -Xbootclasspath:<path>     Override location of bootstrap class files

  -Djava.ext.dirs=<dirs>     Override location of installed extensions

  -Djava.endorsed.dirs=<dirs>Override location of endorsed standards path

  -Xmaxerrs <number>         Set the maximum number of errors to print

  -Xmaxwarns <number>        Set the maximum number of warnings to print

  -Xstdout <filename>        Redirect standard output

  -Xprint                    Print out a textual representation of specified typ

es

  -XprintRounds              Print information about rounds of annotation proces

sing

  -XprintProcessorInfo       Print information about which annotations a process

or is asked to process

  -Xprefer:{source,newer}    Specify which file to read when both a source file

and class file are found for an implicitly compiled class

 

These options are non-standard and subject to change without notice.

-Xline:{关键字列表}

通过该命令我们将看到你java源码文件的一些危险代码，关键字有：{all,cast,deprecation,divzero,empty,unchecked,fallthrough,path,serial,f

inally,overrides,-cast,-deprecation,-divzero,-empty,-unchecked,-fallthrough,-path,-serial,-finally,-overrides,none}，没有"-"前缀的表示开启，有的该前缀的表示关闭，all表示开启所有，none表示都不开启。

示例16：

D:\project\test>javac -cp lib\Util.zip -sourcepath src -Xlint:all -d classes src\com\robin\*.java

src\com\robin\Hello.java:11: warning: [deprecation] destroy() in java.lang.Threa

d has been deprecated

                t.destroy();

                 ^

src\com\robin\Hello.java:12: warning: [divzero] division by zero

                int i=1/0;

                        ^

2 warnings

-Xstdout <filename>

javac命令信息输出流的默认将在当前控制台进行显示，我们可以用该参数进行重新定义。

比如，示例17：

D:\project\test>javac -cp lib\Util.zip -sourcepath src -verbose -Xstdout 1.log -

d classes src\com\robin\*.java

这样我们在1.log文件中将看到；

[parsing started src\com\robin\Hello.java]

[parsing completed 16ms]

[parsing started src\com\robin\People.java]

[parsing completed 0ms]

[search path for source files: src]

[search path for class files: C:\jdk1.6.0\jre\lib\resources.jar,C:\jdk1.6.0\jre\lib\rt.jar,C:\jdk1.6.0\jre\lib\sunrsasign.jar,C:\jdk1.6.0\jre\lib\jsse.jar,C:\jdk1.6.0\jre\lib\jce.jar,C:\jdk1.6.0\jre\lib\charsets.jar,C:\jdk1.6.0\jre\classes,C:\jdk1.6.0\jre\lib\ext\dnsns.jar,C:\jdk1.6.0\jre\lib\ext\localedata.jar,C:\jdk1.6.0\jre\lib\ext\sunjce_provider.jar,C:\jdk1.6.0\jre\lib\ext\sunmscapi.jar,C:\jdk1.6.0\jre\lib\ext\sunpkcs11.jar,lib\Util.zip]

[loading com\hubin\Util.class(com\hubin:Util.class)]

[loading java\lang\Object.class(java\lang:Object.class)]

[loading java\lang\String.class(java\lang:String.class)]

[checking com.robin.Hello]

[wrote classes\com\robin\Hello.class]

[checking com.robin.People]

[wrote classes\com\robin\People.class]

[total 204ms]

-Xmaxerrs <number>  

设置最多显示多少条编译错误

 -Xmaxwarns <number>        

设置最多显示多少条编译警告

其他一些Xlint选项暂时还不知道什么意思，一般也用得比较少，就打住了。

-J选项

将选项传给 javac 调用的 java 启动器。例如， -J-Xms48m 将启动内存设为 48 兆字节。虽然它不以 -X 开头，但它并不是 javac 的‘标准选项’。用 -J 将选项传给执行用 Java 编写的应用程序的虚拟机是一种公共约定。

其他一些javac命令选项暂时还不知道什么意思，一般也用得比较少，就打住了。

另外附前面的示例所用的java源码文件：

src\com\robin\Hello.java文件

package com.robin;

import com.hubin.Util;

public class Hello{

native String getHelloStringFromJni();

People p=new People();

final static String str=Util.getString();

Hello()

{

Thread t=null;

t.start();

t.destroy();

int i=1/0;

long l=10;

int n=(int)l;

}

}

src\com\robin\Peole.java文件

package com.robin;

public class People

{

String name;

}

src\com\hubin\Util.java文件

package com.hubin;

public class Util{

public final static String getString()

{

return "Hi";

}

}