Visibility and the Concept of Fields - Java Object Oriented Design

Description

Visibility and the Concept of Fields

Demo Code

 
class TestClass {
     private long visibleOnlyInThisClass;
     double visibleFromEntirePackage; 
     /* w  w  w  .j av a 2  s . com*/
     void setLong (long val) {
         visibleOnlyInThisClass = val;
     }
     
     long getLong () {
        return visibleOnlyInThisClass;
     }  
}
 
public class Main {            
     public static void main(String[] args) {
         TestClass tc = new TestClass();  
         tc.setLong(32768);
         tc.visibleFromEntirePackage = 3.1415926535;
         System.out.println(tc.getLong());
         System.out.println(tc.visibleFromEntirePackage);
     }
}

Result

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Related Tutorials

• Using the this Keyword to Refer to an Instance Variable Whose Name Is Hidden by a Local Variable
• Example of Using an Instance Initializer
• Declaring Fields in an Interface
• Basic format of a variable declaration:
• Making Private Fields Accessible to Other Classes