. Java . Java Accessability

Java Accessability

The four types of Accessability for classes, methods, and variables

public - Available to all classes.

protected - Available to the package & subclasses.

package - (aka friendly) implied default, no modifier, Available to package

private - Available only to own class, not inherited.

Note: accessability has the same basic rules for classes, methods, and variables.

Test class "Cat"

package com.fluffycat.feline;


class Cat {
   public    String publicString    = "public";
   protected String protectedString = "protected";
             String packageString   = "package";
   private   String privateString   = "private";             
}

Test class "Siamese"

package com.fluffycat.feline;


class Siamese extends Cat {            
    public void findOutAboutCat(Cat catToTest) {
        String testPublic    = catToTest.publicString;
        String testProtected =
                 catToTest.protectedString;   
        String testPackage   = catToTest.packageString;    
        //String testPrivate   = 
        //        catToTest.privateString; 
        //!can't access this
    }
}

Test class "Cheeta"

package com.fluffycat.feline;


class Cheeta {   
    public void findOutAboutCat(Cat catToTest) {
        String testPublic    = 
          catToTest.publicString;
        String testProtected = 
          catToTest.protectedString;   
        String testPackage   = 
          catToTest.packageString;    
        //String testPrivate   = 
        //  catToTest.privateString; 
        //  !can't access this
    }         
}

Test class "Dog"

package com.fluffycat.canine;


import com.fluffycat.cat.Cat;


class Dog {    
    public void findOutAboutCat(Cat catToTest) {
        String testPublic    = catToTest.publicString;
        //String testProtected = 
        //  catToTest.protectedString; 
        //  !can't access this   
        //String testPackage   = 
        //  catToTest.packageString; 
        //  !can't access this
        //String testPrivate   = 
        //  catToTest.privateString; 
        //  !can't access this
    }          
}

Test class "SmallCatLikeDog"

package com.fluffycat.canine;


import com.fluffycat.cat.Cat;


class SmallCatLikeDog extends Cat{    
    public void findOutAboutCat(Cat catToTest) {
        String testPublic    = 
          catToTest.publicString;
        String testProtected =
          catToTest.protectedString;   
        //String testPackage   = 
        //  catToTest.packageString; 
        //  !can't access this
        //String testPrivate   = 
        //  catToTest.privateString; 
        //  !can't access this
    }          
}

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