从另一个包访问 class

Question

我在名为 asdsad 的文件夹中有两个文件夹

.
├── a
│   └── A.java
├── b
│   └── B.java

这是我的A.java

package asdsad.a;

public class A {
    public A() {

    }

    public int number;
}

这是我的B.java

package asdsad.b;
import asdsad.a.A;

public class B {
    public B() {

    }

    public int n = 5;

    public static void main(String[] args) {
        A a = new A();
        System.out.println(a.number);
    }
}

现在我在 asdsad 文件夹内的终端中。我执行javac a/A.java，我没有任何错误。但是当我尝试 javac b/B.java 时，我得到了这些错误：

b/B.java:2: error: cannot find symbol
import asdsad.a.A;
               ^
  symbol:   class A
  location: package asdsad
b/B.java:12: error: cannot find symbol
        A a = new A();
        ^
  symbol:   class A
  location: class B
b/B.java:12: error: cannot find symbol
        A a = new A();
              ^
  symbol:   class A
  location: class B
3 errors

Answer 1

Now I'm in my terminal inside asdsad folder

已经错了。您应该在包含它的文件夹中。一顶。

I execute javac a/A.java, I don't have any errors.

但你还是错了。你应该执行 javac asdsad/a/A.java.

But when I try to javac b/B.java

又错了。应该是 javac asdsad/b/B.java.

从另一个包访问 class

Access class from another package

java

java-package