/**
* Java pass by value!
* Based on https://w...content-available-to-author-only...v.com/3884/java-is-pass-by-value-and-not-pass-by-reference
*/
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		System.out.println("Creating an object called red with an internal property color 'red'");  
		Balloon red = new Balloon("red");
		System.out.println("Object reference of red: "+red.toString());  
		System.out.println("Creating an object called blue with an internal property color 'blue'");  
		Balloon blue = new Balloon("blue");
		System.out.println("Object reference of blue: "+blue.toString());  
 
		System.out.println("\nChanging red color field to uppercase...");  
		System.out.println("Original red color: "+red.getColor());  
		upperCaseColor(red);
		System.out.println("Outside of the upperCaseColor method the color is : "+red.getColor());  
		System.out.println("One may think, it is working on the reference!");  
		System.out.println("But actually it is working on a copy of the reference...");  
 
		System.out.println("\nSwapping objects red by blue...");  
		swap(red, blue);
		System.out.println("But outside swap method, red still reffers to red: "+red.toString());  
		System.out.println("And outside swap method, blue still reffers to blue: "+blue.toString());  
		System.out.println("If b1 and b2 would dealing with references of red and blue, swap method would change the original references.");  
		System.out.println("Conclusion: swap received a copy of the reference of red and a copy of the reference of blue and modified only those copies not the original objects references.");  
	}
 
	public static void swap(Balloon b1, Balloon b2) {  
		System.out.println("Swap received b1 referring to red: "+b1.toString());  
		System.out.println("Swap received b2 referring to blue: "+b2.toString());  
		Object temp = b1;  
		b1=b2;  
		b2=(Balloon)temp; 
		System.out.println("Inside swap method b1 now refers to blue: "+b1.toString());  
		System.out.println("Inside swap method b2 now refers to red: "+b2.toString());  
	}
 
	public static void upperCaseColor(Balloon b) {  
		System.out.println("The method upperCaseColor has a reference of the ballon object, its color is: "+b.getColor());
		b.setColor(b.getColor().toUpperCase());
		System.out.println("After uppercase the color of the object it has reference: "+b.getColor());  
	}
}
 
class Balloon {  
	private String color;  
 
	public Balloon(){}   
 
	public Balloon(String c){  
		this.color=c; 
	}   
 
	public String getColor(){  
		return color; 
	}  
 
	public void setColor(String color) {  
		this.color = color; 
	}
}

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