程序编译但无法在命令箱中运行

Question

every time while i try to run java program in command prompt, it shows "could not find or load the main class.

class A 
{
    public static void main(String[] args) 
    {
        System.out.println("Hello World!");
    }
}

javac -d ../classes A.java compiles successfully

then try to run in classes folder

java A

i got the message "couldn't find or load main class A"

Answer 1

将classes文件夹添加到classpath

java -cp ../classes A

Answer 2

您正在使用-d选项进行编译。因此将创建包结构。如果您的类已打包，则必须使用完全准化的类名，即outerpackage.innerpackge.A