简单的main如何运行
package com.js;

public class testindex {
public void main(String[] args)
{
System.out.println("aa");

}
}

报java.lang.NoClassDefFoundError: testindex
[解决办法]
package com.js;

public class testindex {
public static void main(String[] args)
{
System.out.println("aa");

}
}