英文:
Java Single File for External Classes
问题
我认为Java的做法是将外部类放在单独的文件中。因此，我最终的目录结构如下所示：
/main/main.java
/main/libs/class01.java
/main/libs/class02.java
/main/libs/class03.java
虽然这样做也可以，但其中一些类真的非常简单，例如，如果所有的类都只是：
package libs;
import java.util.*;
public class class01 {
public Integer idno;
public String name;
public class01() {
idno = 1;
name = "First";
}
}
那么单独的文件似乎有点过多。我想知道是否有一种方法将它们合并到单个文件中，类似于在.NET C#中使用命名空间的方式，如下所示：
using System;
using System.Data;
namespace allClasses {
public class class01 {
public Integer idno;
public String name;
public class01() {
idno = 1;
name = "First";
}
}
public class class02 {
public Integer idno;
public String name;
public class02() {
idno = 2;
name = "Second";
}
}
public class class03 {
public Integer idno;
public String name;
public class03() {
idno = 2;
name = "Third";
}
}
}
我可以在主程序中使用它们，就好像它们是分开的一样：
using System;
using allClasses;
namespace main_module {
class main {
static void Main(string[] args) {
class01 newClass01 = new class01();
class02 newClass02 = new class02();
class03 newClass03 = new class03();
}
}
}
对于比较两者，我感到抱歉，只是因为.NET C#是我能够展示我想要实现的内容的最佳示例。我还不知道如何在Java中做到这一点，非常感谢您提供指导。
英文:
I believe the Java way is to keep external classes in separate files. So I've ended up with a directory structure like the following
/main/main.java
/main/libs/class01.java
/main/libs/class02.java
/main/libs/class03.java
Which would be fine but some of the classes are really puny little things, for example if all the classes were just
package libs;
import java.util.*;
public class class01 {
public Integer idno;
public String name;
public class01() {}
idno = 1;
name = "First";
}
}
Then separate files seem like they could get a bit excessive. I'm wondering if there is a way to combine them into a single file similar to the way that you can do in .Net C# with namespaces like the following
using System;
using System.Data;
namespace allClasses {
public class class01 {
public Integer idno;
public String name;
public class01() {}
idno = 1;
name = "First";
}
}
public class class02 {
public Integer idno;
public String name;
public class02() {}
idno = 2;
name = "Second";
}
}
public class class03 {
public Integer idno;
public String name;
public class03() {}
idno = 2;
name = "Third";
}
}
}
Which I can use in my main as if they were all separate
using System;
using allClasses;
namespace main_module {
class main {
static void Main(string[] args) {
class01 newClass01 = new class01();
class02 newClass02 = new class02();
class03 newClass03 = new class03();
}
}
}
I'm sorry for comparing the two it's just that .Net C# is the best example I can show of what I am trying to achieve. I don't know a way of doing this yet in Java, some guidance would be very much appreciated
答案1
得分: 1
你可以将它们声明为另一个公共类内部的 public static class。
例如：
public class Util {
public static class A {}
public static class B {}
}
然后在主类中可以这样引用它们：
new Util.A();
这样可以将源代码合并到一个单独的类中，但正如 @oleg-cherednik 提到的，编译后将会生成几个独立的类文件。
英文:
You can declare them as public static class within another public class.
E.g.
public class Util {
public static class A {}
public static class B {}
}
Then in your main class you can reference them as:
new Util.A();
This will help you combine source code into a single class, but as @oleg-cherednik mentioned, when compiled there will be several separate class files.
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