lectures.alex.balgavy.eu

Lecture notes from university.
git clone git://git.alex.balgavy.eu/lectures.alex.balgavy.eu.git
Log | Files | Refs | Submodules

encapsulation.md (822B)

      1 +++
      2 title = 'Encapsulation'
      3 +++
      4 # Encapsulation
      5 Encapsulation makes sure that sensitive stuff is hidden from users.
      6 
      7 Idea: declare class variables/attributes as private, provide public getters and setters to use the variable.
      8 
      9 ```java
     10 public class Safe {
     11     private String superPrivateInfo;
     12 
     13     public String getSuperPrivateInfo() {
     14         return superPrivateInfo;
     15     }
     16 
     17     public void setSuperPrivateInfo(String newInfo) {
     18         this.superPrivateInfo = newInfo;
     19     }
     20 }
     21 ```
     22 
     23 Classes can be:
     24 - `public`: accessible by any other class
     25 - default: only accessible in same package
     26 
     27 Attributes/methods/constructors can be:
     28 - `public`: accessible by any other class
     29 - `private`: only accessible within declared class
     30 - default: only accessible in same package
     31 - `protected`: only accessible in same package and subclasses