How do getters and setters work

Question

I m from the php world  Could you explain what getters and setters are and could give you some examples

User · Accepted Answer

Tutorial is not really required for this  Read up on encapsulation  private String myField     private  means access to this is restricted  public String getMyField            include validation  logic  logging or whatever you like here     return this myField    public void setMyField String value           include more logic      this myField   value

User · Answer

You may also want to read  quot Why getter and setter methods are evil quot    Though getter setter methods are commonplace in Java  they are not particularly object oriented  OO   In fact  they can damage your code s maintainability  Moreover  the presence of numerous getter and setter methods is a red flag that the program isn t necessarily well designed from an OO perspective  This article explains why you shouldn t use getters and setters  and when you can use them  and suggests a design methodology that will help you break out of the getter setter mentality

User · Answer

Here is an example to explain the most simple way of using getter and setter in java  One can do this in a more straightforward way but getter and setter have something special that is when using private member of parent class in child class in inheritance  You can make it possible through using getter and setter    package stackoverflow       public class StackoverFlow                  private int x           public int getX                         return x                     public int setX int x                      return  this x   x                     public void showX                           System out println  value of x    x                        public static void main String   args                 StackoverFlow sto   new StackoverFlow                sto setX 10               sto getX                sto showX

User · Answer

1  The best getters   setters are smart  Here s a javascript example from mozilla  var o     a 0       o  is now a basic object  Object defineProperty o   quot b quot          get  function               return this a   1               console log o b     Runs the getter  which yields a   1  which is 1   I ve used these A LOT because they are awesome  I would use it when getting fancy with my coding   animation  For example  make a setter that deals with an Number which displays that number on your webpage  When the setter is used it animates the old number to the new number using a tweener  If the initial number is 0 and you set it to 10 then you would see the numbers flip quickly from 0 to 10 over  let s say  half a second  Users love this stuff and it s fun to create  2  Getters   setters in php Example from sof  lt  php class MyClass     private  firstField    private  secondField     public function   get  property        if  property exists  this   property           return  this- gt  property               public function   set  property   value        if  property exists  this   property            this- gt  property    value             return  this          gt   citings   https   developer mozilla org en-US docs Web JavaScript Reference Functions get http   tweener ivank net  Getter and Setter

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class Clock             String time             void setTime  String t                 time   t                         String getTime                  return time                      class ClockTestDrive        public static void main  String    args         Clock c   new Clock        c setTime  12345        String tod   c getTime         System out println time      tod              When you run the program  program starts in mains     object c is created  function setTime   is called by the object c  the variable time is set to the value passed by  function getTime   is called by object c the time is returned  It will passe to tod and tod get printed out

User · Answer

In Java getters and setters are completely ordinary functions  The only thing that makes them getters or setters is convention  A getter for foo is called getFoo and the setter is called setFoo  In the case of a boolean  the getter is called isFoo  They also must have a specific declaration as shown in this example of a getter and setter for  name    class Dummy       private String name       public Dummy           public Dummy String name            this name   name             public String getName             return this name             public void setName String name            this name   name            The reason for using getters and setters instead of making your members public is that it makes it possible to change the implementation without changing the interface  Also  many tools and toolkits that use reflection to examine objects only accept objects that have getters and setters  JavaBeans for example must have getters and setters as well as some other requirements

[java] How do getters and setters work?

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