CODEWITHSUNDEEP
javaaccess-modifiers
John Eipe
John Eipe

Reputation: 11236

Is it possible to achieve the following access levels

Please let me know if these access levels are possible in java, if not what are the alternatives.

Question 1:

From same class:                yes
From subclass same package:     yes
From any class same package:    no
From subclass outside package:  no
From any class outside package: no

and Question 2:

From same class:                yes
From subclass same package:     yes
From any class same package:    no
From subclass outside package:  yes
From any class outside package: no

None of the access modifiers(public/private/default/protected) provide the above set of control.

For eg: I have a private member which is only accessible within the same class. How to give it an access control as stated in my first question?

Upvotes: 2

Views: 143

Answers (7)

yaitloutou
yaitloutou

Reputation: 1791

Yes, It's possible. but as mentioned above, it's not achieved by simply using the default available access modifiers. you need to add a getter to control the access to your attribute or method.

package house;

public class Father {
    private String secret = "I am your father";

    // for Q1 use default, for Q2 use protected
    protected String getSecret() {
        if(this.getClass().getName() != "house.Father") return secret;
        else return "some talk about the weather...";
    }
}

This getter allow the access by inheritance exclusively, and a direct access to the private attribute is always available. but the access by reference is denied.

Upvotes: 0

Joseph
Joseph

Reputation: 947

The subclass in different package cannot be given separate access levels.

Only possible work around is to re-structure the packages :-(

Upvotes: 0

Bharat Sinha
Bharat Sinha

Reputation: 14373

The access specifiers available in java doesn't match your requirements.

There is no distinction for 

From subclass same package:      
From subclass outside package:

Upvotes: 1

Adrian Shum
Adrian Shum

Reputation: 40066

No, it is not possible to achieve the 2 access level requirement you want.

There are only 4 access levels in Java, public, default, protected and private. None of them matches what you are looking for.

Upvotes: 0

atamanroman
atamanroman

Reputation: 11818

None of the java scopes do fit your requirements.

Upvotes: 2

PermGenError
PermGenError

Reputation: 46438

This breakdown should help you decide the answer.

From same class:                 //private, default, protected, public
From subclass same package:      //default, protected, public
From any class same package:     //default, protected public
From subclass outside package:   //protected, public
From any class outside package:  //public

Upvotes: 0

Jon Lin
Jon Lin

Reputation: 143946

You should be able to find them all here: http://docs.oracle.com/javase/tutorial/java/javaOO/accesscontrol.html

Upvotes: 0

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