java命令行编译 运行JAVA类

例子 1

 

• 示例代码

• package com.Javasoft;
  public class Hello{
  	public static void main(String[] args){
  		System.out.println("Hi ？");
  	}
  }
  

• 目录结构

          mytestproject

                                |--  SRC

                                            |-- com

                                                        |--Javasoft

                                                                         |-- Hello.java

• 编译开始

            进入命令窗口

             D:\mytestproject>javac -d classes src/com/Javasoft/Hello.java

             D:\mytestproject>

• 运行

        D:\mytestproject>cd classes

        D:\mytestproject\classes>java com.Javasoft.Hello

        Hi ?

        D:\mytestproject>

 

 

 例子 2

• 示例代码

   

package com.Javasoft;
import java.io.PrintStream;
import com.kettas.common.*;
public class HelloInput{
	public static void main(String[]args){
		System.out.println("Hi ,what will you say? ：");
		String str = com.kettas.common.SystemIn.readString();
		System.out.println("You just told me that：");
		System.out.println(str);
	}
}

  备注： HelloInput类,编译运行都依赖额外JAR文档(见附件)。

 

•   下面是编译以及 运行都通过的方法

           将所依赖的JAR文档（kettas_common.jar）添加至环境变量 CLASSPATH之下

 

           变量名：CLASSPATH

           变量值：.;%JAVA_HOME%\lib;D:\mytestproject\lib\kettas_common.jar

            

           然后运行

           D:\mytestproject>cd classes

           D:\mytestproject>classes>java com.Javasoft.HelloInput

          

 

•  下面是一次简单的尝试 编译成功 运行失败

          

      将依赖的JAR包 copy至lib目录 D：\mytestproject\lib\kettas_common.jar

      编译：

     

D:\>cd mytestproject

D:\mytestproject>cd classes

D:\mytestproject\classes>java com/Javasoft/HelloInput.java
Exception in thread "main" java.lang.NoClassDefFoundError: com/Javasoft/HelloInp
ut/java
Caused by: java.lang.ClassNotFoundException: com.Javasoft.HelloInput.java
        at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
Could not find the main class: com/Javasoft/HelloInput.java.  Program will exit.
   

• 下面是另一种尝试 成功运行

 

      将运行需用的SystemIn.class 文件拷贝至classes目录下

      新结构如下

       D:program\mytestproject

 

                            |--- classes

                                      |---Javasoft

                                               |-- com

                                                    |---.....

                                      |--kettas

                                               |--com

                                                                                                        |----.........

 

      D:\mytestproject\classes\java com.Javasoft.HelloInput

      技能成功运行