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 est>javac -cp libUtil.zip -sourcepath src -verbose -d classes srcc
om obin*.java
[parsing started srccom obinHello.java]
[parsing completed 31ms]
[parsing started srccom obinPeople.java]
[parsing completed 0ms]
[search path for source files: src]
[search path for class files: C:jdk1.6.0jrelib esources.jar,C:jdk1.6.0jre
lib t.jar,C:jdk1.6.0jrelibsunrsasign.jar,C:jdk1.6.0jrelibjsse.jar,C:jd
k1.6.0jrelibjce.jar,C:jdk1.6.0jrelibcharsets.jar,C:jdk1.6.0jreclasses,
C:jdk1.6.0jrelibextdnsns.jar,C:jdk1.6.0jrelibextlocaledata.jar,C:jdk1
.6.0jrelibextsunjce_provider.jar,C:jdk1.6.0jrelibextsunmscapi.jar,C:jd
k1.6.0jrelibextsunpkcs11.jar,libUtil.zip]
[loading srccomhubinUtil.java]
[parsing started srccomhubinUtil.java]
[parsing completed 0ms]
[loading javalangObject.class(javalang:Object.class)]
[loading javalangString.class(javalang:String.class)]
[checking com.robin.Hello]
[loading javalangThread.class(javalang:Thread.class)]
[wrote classescom obinHello.class]
[checking com.robin.People]
[wrote classescom obinPeople.class]
[checking com.hubin.Util]
[wrote classescomhubinUtil.class]
[total 578ms]
D:project est>javac -cp libUtil.zip -sourcepath src -verbose -d classes srccom obin*.java
[parsing started srccom obinHello.java]
[parsing completed 16ms]
[parsing started srccom obinPeople.java]
[parsing completed 0ms]
[search path for source files: src]
[search path for class files: C:jdk1.6.0jrelib esources.jar,C:jdk1.6.0jre
lib t.jar,C:jdk1.6.0jrelibsunrsasign.jar,C:jdk1.6.0jrelibjsse.jar,C:jd
k1.6.0jrelibjce.jar,C:jdk1.6.0jrelibcharsets.jar,C:jdk1.6.0jreclasses,
C:jdk1.6.0jrelibextdnsns.jar,C:jdk1.6.0jrelibextlocaledata.jar,C:jdk1
.6.0jrelibextsunjce_provider.jar,C:jdk1.6.0jrelibextsunmscapi.jar,C:jd
k1.6.0jrelibextsunpkcs11.jar,libUtil.zip]
[loading srccomhubinUtil.java]
[parsing started srccomhubinUtil.java]
[parsing completed 0ms]
[loading javalangObject.class(javalang:Object.class)]
[loading javalangString.class(javalang:String.class)]
[checking com.robin.Hello]
[wrote classescom obinHello.class]
[checking com.robin.People]
[wrote classescom obinPeople.class]
[checking com.hubin.Util]
[wrote classescomhubinUtil.class]
[total 172ms]
D:project est>javac -cp lib-classes -sourcepath src -verbose -d classes srccom obin*.java
[parsing started srccom obinHello.java]
[parsing completed 47ms]
[parsing started srccom obinPeople.java]
[parsing completed 0ms]
[search path for source files: src]
[search path for class files: C:jdk1.6.0jrelib esources.jar,C:jdk1.6.0jre
lib t.jar,C:jdk1.6.0jrelibsunrsasign.jar,C:jdk1.6.0jrelibjsse.jar,C:jd
k1.6.0jrelibjce.jar,C:jdk1.6.0jrelibcharsets.jar,C:jdk1.6.0jreclasses,
C:jdk1.6.0jrelibextdnsns.jar,C:jdk1.6.0jrelibextlocaledata.jar,C:jdk1
.6.0jrelibextsunjce_provider.jar,C:jdk1.6.0jrelibextsunmscapi.jar,C:jd
k1.6.0jrelibextsunpkcs11.jar,lib-classes]
[loading lib-classescomhubinUtil.class]
[loading javalangObject.class(javalang:Object.class)]
[loading javalangString.class(javalang:String.class)]
[checking com.robin.Hello]
[wrote classescom obinHello.class]
[checking com.robin.People]
[wrote classescom obinPeople.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 Settingshubin>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 est>javac -cp libUtil.zip -sourcepath src -Xlint:all -d classes srccom obin*.java
srccom obinHello.java:11: warning: [deprecation] destroy() in java.lang.Threa
d has been deprecated
                t.destroy();
                 ^
srccom obinHello.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 est>javac -cp libUtil.zip -sourcepath src -verbose -Xstdout 1.log -
d classes srccom obin*.java
这样我们在1.log文件中将看到；
[parsing started srccom obinHello.java]
[parsing completed 16ms]
[parsing started srccom obinPeople.java]
[parsing completed 0ms]
[search path for source files: src]
[search path for class files: C:jdk1.6.0jrelib esources.jar,C:jdk1.6.0jrelib t.jar,C:jdk1.6.0jrelibsunrsasign.jar,C:jdk1.6.0jrelibjsse.jar,C:jdk1.6.0jrelibjce.jar,C:jdk1.6.0jrelibcharsets.jar,C:jdk1.6.0jreclasses,C:jdk1.6.0jrelibextdnsns.jar,C:jdk1.6.0jrelibextlocaledata.jar,C:jdk1.6.0jrelibextsunjce_provider.jar,C:jdk1.6.0jrelibextsunmscapi.jar,C:jdk1.6.0jrelibextsunpkcs11.jar,libUtil.zip]
[loading comhubinUtil.class(comhubin:Util.class)]
[loading javalangObject.class(javalang:Object.class)]
[loading javalangString.class(javalang:String.class)]
[checking com.robin.Hello]
[wrote classescom obinHello.class]
[checking com.robin.People]
[wrote classescom obinPeople.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：
srccom obinHello.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;
}
}
srccom obinPeole.java文件
package com.robin;
public class People
{
String name;
}
srccomhubinUtil.java文件
package com.hubin;
public class Util{
public final static String getString()
{
return "Hi";
}
}
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原文地址：https://www.cnblogs.com/LiuYanYGZ/p/6054015.html