'this' keyword used implicitly and explicitly to refer to members of an object. - Java Object Oriented Design

Java examples for Object Oriented Design:this

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Description

'this' keyword used implicitly and explicitly to refer to members of an object.

Demo Code

public class Main 
{
   public static void main(String[] args)
   {//from w  w  w  .ja  v  a 2  s  . c o m
      SimpleTime time = new SimpleTime(15, 30, 19);
      System.out.println(time.buildString());
   } 
} 

// class SimpleTime demonstrates the "this" reference
class SimpleTime 
{
   private int hour; // 0-23
   private int minute; // 0-59
   private int second; // 0-59 

   // if the constructor uses parameter names identical to 
   // instance variable names, the "this" reference is 
   // required to distinguish between the names
   public SimpleTime(int hour, int minute, int second)
   {
      this.hour = hour; // set "this" object's hour
      this.minute = minute; // set "this" object's minute
      this.second = second; // set "this" object's second
   } 

   // use explicit and implicit "this" to call toUniversalString
   public String buildString()
   {
      return String.format("%24s: %s%n%24s: %s", 
         "this.toUniversalString()", this.toUniversalString(),
         "toUniversalString()", toUniversalString());
   } 

   // convert to String in universal-time format (HH:MM:SS)
   public String toUniversalString()
   {
      return String.format("%02d:%02d:%02d", this.hour, this.minute, this.second);
   } 
}

Result


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