包不存在 - Java
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Package does not exists - Java
提问by TheWebs
This is a very trivial question, but stack doesn't seem to have very many good answers on it. (see below for the tree structure)
这是一个非常微不足道的问题，但堆栈似乎没有很多好的答案。（树结构见下文）
in start.javaI am doing: import web.*, but it cant find the package web. All the classes in web are either package web.exceptions;or package web;or even package web.interfaces;
在start.java我正在做：import web.*，但它无法找到包 web。在网络中的所有类或者是package web.exceptions;或者package web;甚至package web.interfaces;
And I thought for importing packages you do: import path.to.package.name.*;where star imports all classes of that package, or you could do import path.*;which would import all packages and sub packages and their classes.
我想导入包你这样做：import path.to.package.name.*;star 导入该包的所有类，或者你可以这样做import path.*;将导入所有包和子包及其类。
What am I missing?
我错过了什么？
The exact error is:
确切的错误是：
start.java:1: error: package web does not exist
The class in question is:
有问题的类是：
package src; // right package?
import web.*;
public class Start{
public static void main(String[] args){
if(args[0].startsWith("--port")){
String[] argument = args[0].split("=");
WebServer webServer = new WebServer(argument[1]);
}
}
}
Tree Path
树路径
I moved Start.javato web/and changed the import web.*;to import server.*;now it doesn't know where server is, or what it is ...
我感动Start.java到web/，改变了import web.*;到import server.*;现在不知道在哪里服务器，或者它是什么？
.
└── src
├── MainClass.txt
└── web
├── Start.java
└── server
├── WebServer.java
├── exceptions
│?? └── WebServerException.java
└── interfaces
└── WebServerInterface.java
采纳答案by Anirban Nag 'tintinmj'
"or you could do import path.*; which would import all packages and sub packages and their classes"
“或者你可以做导入路径。*；这将导入所有包和子包及其类”
This is totally wrong. If we say
这是完全错误的。如果我们说
import java.util.*;
we mean that import all classes from java/util/path. If what you are saying is true then we can just say
我们的意思是从java/util/路径导入所有类。如果你说的是真的，那么我们只能说
import java.*;
even
甚至
import *.*;
and it will import all classes under JDK. NO IT'S NOT.
它将导入JDK下的所有类。不，不是。
After OP's EDIT
OP 编辑后
Start.javais under src/web/folder. So the package statement of Start.javashould be
Start.java在src/web/文件夹下。所以包的声明Start.java应该是
package web;
Now if you want to use WebServer.javause
现在如果你想使用WebServer.java使用
import web.server.WebServer;
Now if you want to use WebServerException.javause
现在如果你想使用WebServerException.java使用
import web.server.exceptions.WebServerException;
Now if you want to use WebServerInterface.javause
现在如果你想使用WebServerInterface.java使用
import web.server.interfaces.WebServerInterface;
And please read basic tutorial before you write any code.
并且请在编写任何代码之前阅读基本教程。
Read about Packages.
阅读关于包。
