小编use*_*872的帖子

最近开始学习Java考试.

学习包时,试过这个并收到错误信息.我做的是,

    //Creating class A (Within package the package: com.test.helpers)

    package com.test.helpers;
    public class A {
        public void sayHello(){
            System.out.println("Hello World");
        }
    }

    //And then the class App utilizing the class A

    import com.test.helpers.*;

    public class App{
        public static void main(String args[]){
            A a = new A();
            a.sayHello();
        }
    }

我将这两个文件放在名为"JavaTest"的目录中(在Windows 7上),并首先使用命令"javac -d.A.java"编译A.java.

然后,在尝试编译App.java时,我收到以下错误消息:

    App.java:5: error: cannot access A
                    A a = new A();
                    ^
      bad source file: .\A.java
        file does not contain class A
        Please remove or make sure …