Declaring Member Variables (The Java™ Tutorials > Learning the Java Language >... - The Diigo Meta page

• 24 Aug 09
  

  Lance Pedersen
  • Member variables in a class—these are called fields
  • Variables in a method or block of code—these are called local variables
  • method declarations
  • parameters
  • • Zero or more modifiers, such as public or private.   
    • The field's type.  
    • The field's name.
  • • public modifier—the field is accessible from all classes.  
    • private modifier—the field is accessible only within its own  class.
  • We still need access to these values, however. This can be done  indirectly by adding public methods that obtain the field values for us
  • private int cadence;  private int gear;  private int speed;
  • public int getCadence() {  return cadence;  }    public void setCadence(int newValue) {  cadence = newValue;  }

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• 10 Feb 09
  

  Roy Jensen
  • There are several kinds of variables: 
     
    • Member variables in a class—these are called fields. 
     
    • Variables in a method or block of code—these are called local variables. 
     
    • Variables in method declarations—these are called parameters. 
  • Field declarations are composed of three components, in order: 
     
    1. Zero or more modifiers, such as public or private. 
     
    2. The field's type. 
     
    3. The field's name. 

  • Access Modifiers

     The first (left-most) modifier used lets you control what other classes have access to a member field. For the moment,  consider only public and private. Other access modifiers will be discussed later.  
     
    •  public modifier—the field is accessible from all classes. 
     
    •  private modifier—the field is accessible only within its own class. 
      
     

     In the spirit of encapsulation, it is common to make fields private.

  • Types

     All variables must have a type. You can use primitive types such as int, float, boolean, etc. Or you can use reference types, such as strings, arrays, or objects.

  • In this  lesson,  be aware that the same naming rules and conventions are used for method and class names, except that  

     
    •  the first letter of a class name should be capitalized, and 
     
    •  the first (or only) word in a method name should be a verb. 

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• 27 Mar 07
  

  Mukesh Soni
  • modifier used lets you control what other classes have access to a member field.
  • • public modifier—the field is accessible from all classes. 
     
    •  private modifier—the field is accessible only within its own class.
  • •  the first letter of a class name should be capitalized, and 
     
    •  the first (or only) word in a method name should be a verb.

  1 more annotation...

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