从另一个项目中的另一个类获取变量

Question

I have 3 project. (and Ignore all Connection to database and Registry to Computer). Project A = API (java library), Project B = Java Class (Server) , Project C = Java Class (Client) .

in Project AI have 1 java class for entity , lets say (entity.java)

private Boolean data;
private String name;    
public void Data_set(Boolean data){
this.data = data;
}
public void Name_set(String name){
this.name = name
}        
public Boolean Data_get() {
return data;
}
public String Name_get() {
return name;
}

in Project A, I have 1 Interface , lets say (interface.java)

public void method();

in Project B 1 java class which implements interface.java, lets give it a name (server.java) which import all java & interface class on project A.

public void method() {
entity Entity = new entity();
Entity.Data_set(true);
Entity.Name_set("Someone");
}

in Project C 1 java main class, lets give it a name (main.java) which import all java & interface class on project A.

server Server = new server();
Server.method();
entity Entity = new entity();
System.out.print("Boolean = "Entity.Data_is();
System.out.print("Name = "Entity.Name_get();

WHAT I WANT. After I run "main.java" It should be below

Boolean = true
Name = someone

but it show difference value it show below.

Boolean = false
Name = null

but if i set entity on "main.java" not in server.java the result there are no problem.

NOTE for connection database and connection between client-server there are no problem.

Is there any solution for this.

Thanks.

Answer 1

It sounds as if you create an Entity in the Server class:

class Server implements Interface {
    private Entity entity;

    public void method() {
        entity = new Entity();
        entity.setName(...);
        entity.setData(...);
    }
}

But rather than print the details of that entity, you create a new one and print the details to that one (which you never assign it any details):

class Main {
    public static void main(String[] args) {
        Server server = new Server();
        server.method();

        Entity entity = new Entity();
        //print entity
    }
}

What you should be doing is grabbing the entity from the server:

  class Main {
    public static void main(String[] args) {
        Server server = new Server();
        server.method();

        Entity entity = server.getEntity();
        //print entity
    }
}

class Server {
    private Entity entity;

    public void method() {
        entity = new Entity();
        entity.setName(...);
        entity.setData(...);
    }

    public Entity getEntity() {
        return entity;
    }
}

As you may have noticed, I used a different style of capitalization than you used. The capitalization style I used is the coding convention people typically use when writing Java. Language have their own styles, it's best to stay consistent with the language's choice of style .