/**
 * ThisTest.java
 * this used implicitly and explicitly to refer to members of an object.
 *
 * Ilham Febriyanto
 * 26 February 2017
 */

public class ThisTest
{
    public static void main (String[] args)
    {
     SimpleTime time = new SimpleTime (15, 30, 19);
     System.out.println (time.buildString());
    } // end main
} // end class ThisTest

// 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
    } // end SimpleTime constructor

    // 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());
    } // end method buildString

    // convert to String in universal-time format (HH:MM:SS)
    public String toUniversalString()
    {
        // "this" is not required here to access instance variables,
        // because method does not have local variables with same
        // names as instance variables
        return String.format ("%02d:%02d:%02d",
            this.hour, this.minute, this.second);
    } // end method toUniversalString
} // end class SimpleTime