java入门基础

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</pre><p><span style="color:rgb(53,53,53); font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:16px; line-height:28px; text-indent:32px"></span></p><p><span style="color:rgb(53,53,53); font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:16px; line-height:28px; text-indent:32px"></span></p><p><span style="color:rgb(53,53,53); font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:16px; line-height:28px; text-indent:32px"></span></p><p></p><span style="font-family:FangSong_GB2312"></span><p></p><p><span style="font-size:14px; color:rgb(51,0,51); background-color:rgb(255,255,255)"><span style="font-family:FangSong_GB2312">一、配置java环境变量（一劳永逸）： ================<span style="font-size:14px">右击我的电脑-->属性-->高级-->环境变量</span></span></span></p><p><span style="font-size:14px; color:rgb(51,0,51); background-color:rgb(255,255,255)"><span style="font-family:FangSong_GB2312">      <span style="line-height:25.265625px"> </span><span style="word-break:break-all">Windows下JAVA用到的环境变量主要有3个，JAVA_HOME、CLASSPATH、PATH</span></span></span></p><p><span style="word-break:break-all; background-color:rgb(255,255,255)"><span style="font-size:14px; color:rgb(51,0,51)"><span style="font-family:FangSong_GB2312">     <span style="line-height:25.265625px"> 1：</span><span style="word-break:break-all"><span style="word-break:break-all">JAVA_HOME </span></span><span style="line-height:25.265625px">指向的是JDK的安装路径      </span></span></span></span></p><p><span style="word-break:break-all; background-color:rgb(255,255,255)"><span style="font-size:14px; color:rgb(51,0,51)"><span style="line-height:25.265625px"><span style="font-family:FangSong_GB2312">                    比如我的本机为： E:\Java\jdk1.6.0_20</span></span></span></span></p><p><span style="word-break:break-all"><span style="line-height:25.265625px; background-color:rgb(255,255,255)"><span style="font-size:14px; color:rgb(51,0,51)"><span style="font-family:FangSong_GB2312">       2：<span style="word-break:break-all"><span style="word-break:break-all">PATH</span></span><span style="line-height:25.265625px"> 环境变量原来Windows里面就有，你只需修改一下，使他指向JDK的bin目录</span></span></span></span></span></p><p><span style="word-break:break-all"><span style="line-height:25.265625px"><span style="line-height:25.265625px; background-color:rgb(255,255,255)"><span style="font-size:14px; color:rgb(51,0,51)"><span style="font-family:FangSong_GB2312">                    <span style="line-height:25.265625px">设置方法是保留原来的PATH的内容，并在其中加上%JAVA_HOME%\bin</span></span></span></span></span></span></p><p><span style="word-break:break-all"><span style="line-height:25.265625px"><span style="line-height:25.265625px"><span style="line-height:25.265625px; background-color:rgb(255,255,255)"><span style="font-size:14px; color:rgb(51,0,51)"><span style="font-family:FangSong_GB2312">       3： CLASSPATH：指定到哪里去找运行时需要用到的类代码（字节码）</span></span></span></span></span></span></p><p><span style="word-break:break-all"><span style="line-height:25.265625px"><span style="line-height:25.265625px"><span style="line-height:25.265625px; background-color:rgb(255,255,255)"><span style="font-size:14px; color:rgb(51,0,51)"><span style="font-family:FangSong_GB2312">                    比如我的本机为： <span style="font-size:14px">CLASSPATH=.;%JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\lib\tools.jar</span>  </span></span></span></span></span></span></p><p><span style="word-break:break-all"><span style="line-height:25.265625px"><span style="line-height:25.265625px"><span style="line-height:25.265625px; background-color:rgb(255,255,255)"><span style="font-size:14px; color:rgb(51,0,51)"><span style="font-family:FangSong_GB2312"></span></span></span></span></span></span></p><p><span style="font-size:14px; color:rgb(51,0,51)"><span style="line-height:25.265625px"><span style="font-family:FangSong_GB2312">二、要学会的Windows下的命令行方式</span></span></span></p><p><span style="color:#330033"><span style="font-family:FangSong_GB2312"><span style="font-size:14px"><span style="line-height:25.265625px">         dir : 列出当前目录下的文件以及文件夹         md : 创建目录</span></span><span style="line-height:25.265625px; font-size:14px"> </span></span></span></p><p><span style="line-height:25.265625px; font-size:14px"><span style="color:#330033"><span style="font-family:FangSong_GB2312">         rd : 删除目录</span></span></span></p><p><span style="font-size:14px; color:rgb(51,0,51)"><span style="line-height:25.265625px"><span style="font-family:FangSong_GB2312">         cd : 进入指定目录         cd.. : 退回到上一级目录         cd/ : 退回到根目录         del : 删除文件</span></span></span></p><p><span style="font-size:14px; color:rgb(51,0,51)"><span style="line-height:25.265625px"><span style="font-family:FangSong_GB2312">         exit : 推出dos命令行</span></span></span></p><p><span style="font-size:14px; color:rgb(51,0,51)"><span style="line-height:25.265625px"><span style="font-family:FangSong_GB2312"></span></span></span></p><p><span style="font-size:14px; color:rgb(51,0,51)"><span style="line-height:25.265625px"><span style="font-family:FangSong_GB2312">三、Java语言的三种技术架构</span></span></span></p><p><span style="font-size:14px; color:rgb(51,0,51)"><span style="line-height:25.265625px"><span style="font-family:FangSong_GB2312">     J2EE(Java 2 Platform Enterprise Edition)企业版</span></span></span></p><p><span style="font-size:14px; color:rgb(51,0,51)"><span style="line-height:25.265625px"><span style="font-family:FangSong_GB2312">     J2SE（Java 2 Platform Standard Edition）标准版</span></span></span></p><p><span style="word-break:break-all"><span style="line-height:25.265625px"><span style="line-height:25.265625px"><span style="line-height:25.265625px; background-color:rgb(255,255,255)"><span style="font-size:14px; color:rgb(51,0,51)"><span style="font-family:FangSong_GB2312">     J2ME(Java 2 Platform Micro Edition)小型版</span></span></span></span></span></span></p><p><span style="word-break:break-all"><span style="line-height:25.265625px"><span style="line-height:25.265625px"><span style="line-height:25.265625px; background-color:rgb(255,255,255)"><span style="font-size:14px; color:rgb(51,0,51)"><span style="font-family:FangSong_GB2312">     Java5.0版本后，更名为JAVAEE JAVASE JAVAME</span></span></span></span></span></span></p><p><span style="word-break:break-all"><span style="line-height:25.265625px"><span style="line-height:25.265625px"><span style="line-height:25.265625px; background-color:rgb(255,255,255)"><span style="font-size:14px; color:rgb(51,0,51)"><span style="font-family:FangSong_GB2312"></span></span></span></span></span></span></p><p><span style="word-break:break-all"><span style="line-height:25.265625px"><span style="line-height:25.265625px"><span style="line-height:25.265625px; background-color:rgb(255,255,255)"><span style="font-size:14px; color:rgb(51,0,51)"><span style="font-family:FangSong_GB2312">四、JRE,JDK 介绍</span></span></span></span></span></span></p><p><span style="word-break:break-all"><span style="line-height:25.265625px"><span style="line-height:25.265625px"><span style="line-height:25.265625px; background-color:rgb(255,255,255)"><span style="font-size:14px; color:rgb(51,0,51)"><span style="font-family:FangSong_GB2312">     JRE(Java Runtime Environment Java运行环境)</span></span></span></span></span></span></p><p><span style="word-break:break-all"><span style="line-height:25.265625px"><span style="line-height:25.265625px"><span style="line-height:25.265625px; background-color:rgb(255,255,255)"><span style="font-size:14px; color:rgb(51,0,51)"><span style="font-family:FangSong_GB2312">         如果要运行一个java 程序，必须安装JRE 。建议：安装路径不要有中文或者特殊符号 如空格等。</span></span></span></span></span></span></p><p><span style="word-break:break-all"><span style="line-height:25.265625px"><span style="line-height:25.265625px"><span style="line-height:25.265625px; background-color:rgb(255,255,255)"><span style="font-size:14px; color:rgb(51,0,51)"><span style="font-family:FangSong_GB2312">     JDK(Java Development Kit Java开发工具包)</span></span></span></span></span></span></p><p><span style="word-break:break-all"><span style="line-height:25.265625px"><span style="line-height:25.265625px"><span style="line-height:25.265625px; background-color:rgb(255,255,255)"><span style="font-size:14px; color:rgb(51,0,51)"><span style="font-family:FangSong_GB2312">         如果要进行java开发，必须安装 JDK 和 JRE</span></span></span></span></span></span></p><p><span style="word-break:break-all"><span style="line-height:25.265625px"><span style="line-height:25.265625px"><span style="line-height:25.265625px; background-color:rgb(255,255,255)"><span style="font-size:14px; color:rgb(51,0,51)"><span style="font-family:FangSong_GB2312"></span></span></span></span></span></span></p><p><span style="word-break:break-all"><span style="line-height:25.265625px"><span style="line-height:25.265625px"><span style="line-height:25.265625px; background-color:rgb(255,255,255)"><span style="font-size:14px; color:rgb(51,0,51)"><span style="font-family:FangSong_GB2312">五、配置临时环境变量</span></span></span></span></span></span></p><p><span style="color:#330033"><span style="font-family:FangSong_GB2312"><span style="word-break:break-all"><span style="line-height:25.265625px"><span style="line-height:25.265625px"><span style="line-height:25.265625px; background-color:rgb(255,255,255)"><span style="font-size:14px">    *临时配置方式：通过dos命令中set命令完成</span></span></span></span></span><span style="font-size:14px; line-height:25.265625px">       </span></span></span></p><p><span style="word-break:break-all"><span style="line-height:25.265625px"><span style="line-height:25.265625px"><span style="line-height:25.265625px; background-color:rgb(255,255,255)"><span style="font-size:14px; color:rgb(51,0,51)"><span style="font-family:FangSong_GB2312">                  set ：                用于查看本机的所有环境变量的信息。                  set 变量名：          查看具体一个环境变量的值。                  set 变量名=：         清空一个环境变量的值。                  set 变量名=具体值：   给指定变量定义具体值。</span></span></span></span></span></span></p><p><span style="word-break:break-all"><span style="line-height:25.265625px"><span style="line-height:25.265625px"><span style="line-height:25.265625px; background-color:rgb(255,255,255)"><span style="font-size:14px; color:rgb(51,0,51)"><span style="font-family:FangSong_GB2312"></span></span></span></span></span></span></p><p><span style="color:#330033"><span style="font-family:FangSong_GB2312"><span style="word-break:break-all"><span style="line-height:25.265625px"><span style="line-height:25.265625px"><span style="line-height:25.265625px; background-color:rgb(255,255,255)"><span style="font-size:14px">    *想要在原有环境变量值基础上添加新值呢？</span></span></span></span></span><span style="font-size:14px; line-height:25.265625px">               </span></span></span></p><p><span style="word-break:break-all"><span style="line-height:25.265625px"><span style="line-height:25.265625px"><span style="line-height:25.265625px; background-color:rgb(255,255,255)"><span style="font-size:14px; color:rgb(51,0,51)"><span style="font-family:FangSong_GB2312">                  首先，通过%变量名%操作符获取到原有环境变量的值。                  然后加上新值后在定义给该变量名即可                  举例：给path环境变量加入新值                  set path=新值;%path%</span></span></span></span></span></span></p><p><span style="word-break:break-all"><span style="line-height:25.265625px"><span style="line-height:25.265625px"><span style="line-height:25.265625px; background-color:rgb(255,255,255)"><span style="font-size:14px; color:rgb(51,0,51)"><span style="font-family:FangSong_GB2312">    注意：这种配置方式只在当前dos窗口有效。窗口关闭，配置消失</span></span></span></span></span></span></p><p><span style="word-break:break-all"><span style="line-height:25.265625px"><span style="line-height:25.265625px"><span style="line-height:25.265625px; background-color:rgb(255,255,255)"><span style="font-size:14px; color:rgb(51,0,51)"><span style="font-family:FangSong_GB2312"></span></span></span></span></span></span></p><p><span style="word-break:break-all"><span style="line-height:25.265625px"><span style="line-height:25.265625px"><span style="line-height:25.265625px; background-color:rgb(255,255,255)"><span style="font-size:14px; color:rgb(51,0,51)"><span style="font-family:FangSong_GB2312">六、简单的开发流程：</span></span></span></span></span></span></p><p><span style="word-break:break-all"><span style="line-height:25.265625px"><span style="line-height:25.265625px"><span style="line-height:25.265625px; background-color:rgb(255,255,255)"><span style="font-size:14px; color:rgb(51,0,51)"><span style="font-family:FangSong_GB2312">     1.将Java代码编写到扩展名为.java的文件中。     2.通过javac命令对该java文件进行编译。     3.通过java命令对生成的class文件进行运行。</span></span></span></span></span></span></p><p><span style="word-break:break-all"><span style="line-height:25.265625px"><span style="line-height:25.265625px"><span style="line-height:25.265625px; background-color:rgb(255,255,255)"><span style="font-size:14px; color:rgb(51,0,51)"><span style="font-family:FangSong_GB2312"></span></span></span></span></span></span></p><p><span style="font-size:14px; color:rgb(51,0,51)"><span style="line-height:25.265625px"><span style="font-family:FangSong_GB2312">七、<span style="font-size:14px">Java的垃圾回收：</span><br style="font-size:14px" /><span style="font-size:14px; white-space:pre"></span><span style="font-size:14px">      由一个后台线程gc进行垃圾回收</span><br style="font-size:14px" /><span style="font-size:14px; white-space:pre"></span><span style="font-size:14px">      虚拟机判定内存不够的时候会中断代码的运行，这时候gc才进行垃圾回收</span><br style="font-size:14px" /><span style="font-size:14px; white-space:pre"></span><span style="font-size:14px">      缺点：不能够精确的去回收内存</span><br style="font-size:14px" /><span style="font-size:14px; white-space:pre"></span><span style="font-size:14px">      java.lang.System.gc();</span><span style="font-size:14px; white-space:pre"></span><span style="font-size:14px">建议回收内存，但系统不一定回应，他会先去看内存是否够用，够用则不予理睬，不够用才会去进行垃圾回收</span></span></span></span></p><p><span style="font-size:14px; color:rgb(51,0,51)"><span style="line-height:25.265625px"><span style="font-family:FangSong_GB2312"> <br style="font-size:14px" /><span style="font-size:14px; white-space:pre"></span><span style="font-size:14px">       内存中什么算是垃圾：</span><br style="font-size:14px" /><span style="font-size:14px; white-space:pre"></span><span style="font-size:14px">            不在被引用的对象(局部变量，没有指针指向的)</span></span></span></span></p><p><span style="font-size:14px; color:rgb(51,0,51)"><span style="line-height:25.265625px"><span style="font-size:14px"><span style="font-family:FangSong_GB2312"></span></span></span></span></p><p><span style="font-size:14px; color:rgb(51,0,51)"><span style="line-height:25.265625px"><span style="font-size:14px"><span style="font-family:FangSong_GB2312">八.  Java 源文件的命名规则：</span></span></span></span></p><p><span style="font-size:14px; color:rgb(51,0,51)"><span style="line-height:25.265625px"><span style="font-size:14px"><span style="font-family:FangSong_GB2312">      1： java源文件的后缀必须是.java，不能是其他文件后缀名。</span></span></span></span></p><p><span style="font-size:14px; color:rgb(51,0,51)"><span style="line-height:25.265625px"><span style="font-size:14px"><span style="font-family:FangSong_GB2312">      2： 在通常情况下，java源文件名可以是任意的，但有一种情况例外：如果java 程序源代码中有一个public 类</span></span></span></span></p><p><span style="font-size:14px; color:rgb(51,0,51)"><span style="line-height:25.265625px"><span style="font-size:14px"><span style="font-family:FangSong_GB2312">          则该源文件的主文件名必须与该public类的类名相同。</span></span></span></span></p><p><span style="font-size:14px; color:rgb(51,0,51)"><span style="line-height:25.265625px"><span style="font-size:14px"><span style="font-family:FangSong_GB2312">          由于：java程序源文件的文件名必须与public类的类名相同，因此，一个java源文件最多只能定义一个public类。</span></span></span></span></p><p><span style="word-break:break-all"><span style="line-height:25.265625px"><span style="line-height:25.265625px"><span style="line-height:25.265625px; background-color:rgb(255,255,255)"><span style="font-size:14px; color:rgb(51,0,51)"><span style="font-family:FangSong_GB2312">     </span></span></span></span></span></span></p><p><span style="word-break:break-all"><span style="line-height:25.265625px"><span style="line-height:25.265625px"><span style="line-height:25.265625px; background-color:rgb(255,255,255)"><span style="font-size:14px; color:rgb(51,0,51)"><span style="font-family:FangSong_GB2312">       建议： </span></span></span></span></span></span></p><p><span style="word-break:break-all"><span style="line-height:25.265625px"><span style="line-height:25.265625px"><span style="line-height:25.265625px; background-color:rgb(255,255,255)"><span style="font-size:14px; color:rgb(51,0,51)"><span style="font-family:FangSong_GB2312">       1： 一个java源文件只定义一个类，不同的类使用不同的源文件定义。</span></span></span></span></span></span></p><p><span style="word-break:break-all"><span style="line-height:25.265625px"><span style="line-height:25.265625px"><span style="line-height:25.265625px; background-color:rgb(255,255,255)"><span style="font-size:14px; color:rgb(51,0,51)"><span style="font-family:FangSong_GB2312">       2： 让java源文件的主文件名与该源文件中定义的public类同名。</span></span></span></span></span></span></p><p><span style="word-break:break-all"><span style="line-height:25.265625px"><span style="line-height:25.265625px"><span style="line-height:25.265625px; background-color:rgb(255,255,255)"><span style="font-size:14px; color:rgb(51,0,51)"><span style="font-family:FangSong_GB2312"></span></span></span></span></span></span></p><p><span style="font-size:14px; color:rgb(51,0,51)"><span style="line-height:25.265625px"><span style="font-family:FangSong_GB2312">九、大小写问题</span></span></span></p><p><span style="font-size:14px; color:rgb(51,0,51)"><span style="line-height:25.265625px"><span style="font-family:FangSong_GB2312">     java语言是严格区分大小写的，Linux平台也是区分大小写的。</span></span></span></p><p><span style="font-size:14px; color:rgb(51,0,51)"><span style="line-height:25.265625px"><span style="font-family:FangSong_GB2312">     java中class 和 Class 是不同的两个词</span></span></span></p><p><span style="font-size:14px; color:rgb(51,0,51)"><span style="line-height:25.265625px"><span style="font-family:FangSong_GB2312">     java程序的关键字全部是小写的，无须大写任何字母。</span></span></span></p><p><span style="font-size:14px; color:rgb(51,0,51)"><span style="line-height:25.265625px"><span style="font-family:FangSong_GB2312"></span></span></span></p><p><span style="font-size:14px; color:rgb(51,0,51)"><span style="line-height:25.265625px"><span style="font-family:FangSong_GB2312">十、<span style="font-size:14px">包(package)：  </span></span></span></span></p><p><span style="font-size:14px; color:rgb(51,0,51)"><span style="line-height:25.265625px"><span style="font-family:FangSong_GB2312"><span style="font-size:14px">        把源文件放在目录下</span><br style="font-size:14px" /><span style="font-size:14px; white-space:pre"></span><span style="font-size:14px">        由于工程的需要，将不同的源文件放在不同的目录下，从而引入了包。</span><br style="font-size:14px" /><span style="font-size:14px; white-space:pre"></span><span style="font-size:14px">        包可以看作就是一个存放java源文件的目录。</span><br style="font-size:14px" /><span style="font-size:14px; white-space:pre"></span><span style="font-size:14px">        在源码中声明一个包名：package p;(只能放在第一行，且最多只能是一行)</span><br style="font-size:14px" /><span style="font-size:14px; white-space:pre"></span><span style="font-size:14px">        如果指定多层包，那么在包名之间我们可以用.作为分隔符：package p1.p2.p3.p4;</span><br style="font-size:14px" /><span style="font-size:14px; white-space:pre"></span><span style="font-size:14px">        用“javac HelloWorld.java –d 绝对路径”，编译后生成的字节码文件就会放在指定的包结构下</span><br style="font-size:14px" /><span style="font-size:14px; white-space:pre"></span><span style="font-size:14px">        执行该程序需要用" java 包名.类名 "</span><br style="font-size:14px" /><span style="font-size:14px; white-space:pre"></span><span style="font-size:14px">        引进包中的某个类：import 包名.类名;</span><br style="font-size:14px" /><span style="font-size:14px; white-space:pre"></span><span style="font-size:14px">        引进包中的所有类：import 包名.*;</span></span></span></span></p><p><span style="color:#330033"><span style="font-family:FangSong_GB2312"></span></span></p><p><span style="color:#330033"><span style="font-family:FangSong_GB2312"><span style="font-size:14px"><span style="line-height:25.265625px">十一、</span></span><span style="font-size:14px; line-height:25.265625px">注释：</span></span></span></p><p><span style="font-size:14px; color:rgb(51,0,51)"><span style="line-height:25.265625px"><span style="font-family:FangSong_GB2312"><span style="font-size:14px; white-space:pre"></span>        //<span style="font-size:14px; white-space:pre"></span><span style="font-size:14px">单行注释， 到本行结束的所有字符会被编译器忽略</span><br style="font-size:14px" /><span style="font-size:14px; white-space:pre"></span><span style="font-size:14px">        /* */</span><span style="font-size:14px; white-space:pre"></span><span style="font-size:14px">多行注释，  在/*  */之间的所有字符会被编译器忽略</span></span></span></span></p><p><span style="color:#330033"><span style="font-family:FangSong_GB2312"><span style="font-size:14px"><span style="line-height:25.265625px"><br style="font-size:14px" /><span style="font-size:14px; white-space:pre"></span><span style="font-size:14px">        /**  */  </span><span style="font-size:14px; white-space:pre"></span><span style="font-size:14px">文档注释， java特有的，在/**  */之间的所有字符会被编译器忽略</span><br style="font-size:14px" /><span style="font-size:14px; white-space:pre"></span><span style="font-size:14px">        可以用javadoc把java源程序中这种注释抽取出来形成html页面(只有写在包，类，属性，方法，构造器，引入之前的注释才可以进行抽取)</span></span></span><span style="font-size:14px; line-height:25.265625px"> </span></span></span></p><p><span style="font-size:14px; color:rgb(51,0,51)"><span style="line-height:25.265625px"><span style="font-family:FangSong_GB2312">        重点看这种文档注释：</span></span></span></p><p><span style="font-size:16px; line-height:28px; white-space:pre"><span style="color:#330033"><span style="font-family:FangSong_GB2312">常用标记有：</span></span></span></p><p><span style="font-family:FangSong_GB2312; font-size:16px; line-height:28px">                   @author</span></p><div style="line-height:28px; font-size:16px"><div style="line-height:28px; font-size:16px"><span style="font-family:FangSong_GB2312">                   @version</span></div><div style="line-height:28px; font-size:16px"><span style="font-family:FangSong_GB2312">                   @deprecated   不推荐使用的标记</span></div><div style="line-height:28px; font-size:16px"><span style="font-family:FangSong_GB2312">                   @param 方法的参数说明</span></div><div style="line-height:28px; font-size:16px"><span style="font-family:FangSong_GB2312">                   @return </span></div><div style="line-height:28px; font-size:16px"><span style="font-family:FangSong_GB2312">                   @see 参见</span></div><div style="line-height:28px; font-size:16px"><span style="font-family:FangSong_GB2312">                   @exception   抛出异常的类型</span></div><div style="line-height:28px; font-size:16px"><span style="font-family:FangSong_GB2312">                   @throws  抛出的异常</span><pre name="code" class="java"><span style="font-family:FangSong_GB2312">package lee;/** * Description: * <br/>网站: <a href="http://www.itcast.com">传智播客</a>  * <br/>Copyright (C), 2001-2012，ylc * <br/>This program is protected by copyright laws. * <br/>Program Name: * <br/>Date: * @author [e-mail] * @version 1.0 */</span>

<div style="line-height:28px; font-size:16px"><pre name="code" class="java"><span style="font-family:FangSong_GB2312">public class JavadocTest{/** * 简单测试Field */protected String name;/** * 主方法，程序的入口 */public static void main(String[] args) {System.out.println("Hello World!");}}</span>

            javadoc 常用的选项有：

                   -d  指定一个路径

                   -windowtitle  指定API文档的浏览器窗口标题

                   -doctitle  指定概述页面的标题。

                   -header   每个页面的页眉

      所以 ：

      执行   javadoc   -d   .   -author  -version    包名.java

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