Running the java class file from the command line prompts that the main class cannot be found or cannot be loaded.

问题如下

TestOne.java

package moon.star;
public class TestOne {
	public void fTestOne() {
  		System.out.println("I an a method In TestOne class");	
	}
}

相关学习视频推荐：java视频教程

TestTwo.java

package moon.star;
public class TestTwo {
	public void fTestTwo() {
  		System.out.println("I an a method In TestTwo class");
 	}
}

运行的代码：

import moon.star.*;
public class Use {	
	public static void main(String args[]) {
  		TestOne a = new TestOne();
  		a.fTestOne();
  		TestTwo b = new TestTwo();
  		b.fTestTwo();
 	}
}

输入 javac Use.java编译没有问题，输入java Use运行时却出错！

问题解决

命令行输入set classpath=C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\Jerry.jar;.;E:\1000

来指明我的moon.star包的位置，位置是E:\1000，即包名为moon.star的类的字节码存放在E:\1000\moon\star目录中。用户可以更新classpath的设置。

C:\Users\前世药师\Desktop>set classpath=C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\Jerry.jar;.;E:\1000

问题解决，成功运行结果图如下：

想了解更多相关问题，可以访问：java语言入门

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