/**
 * Confuse.java
 *      Illustrates variable scope.
 * 
 * Program output is:
 *    Inside constructor, x and y are: 0 0
 *    Inside startUp, x and y are: 1 2
 *       Inside first, x and y are: 3 5
 *    After call to first, x and y are: 1 2
 *       Inside second, a and b are: 4 6
 *       Inside second, x and y are: 0 0
 *    After call to second, x and y are: 1 2
 *       Inside third, x and y are: 3 5
 *    After call to third, x and y are: 1 2
 */

public class Confuse
{
    private int x;      // instance variables (a.k.a. fields)
    private int y;

    public static void main(String[] argv)
    {
      Confuse myConfuseObject;          
      myConfuseObject = new Confuse();
      myConfuseObject.startUp();
    }
    
    public Confuse()
    {
         x = 0; y = 0;  // initialize fields
         System.out.println("Inside constructor, x and y are: " + x + " " + y);
    }

    public void first(int x, int y)
    {
        x = 3; y = 5;
        System.out.println("   Inside first, x and y are: " + x + " " + y);       
    }
    
    public void second(int a, int b)
    {
        a = 4; b = 6;
        System.out.println("   Inside second, a and b are: " + a + " " + b);       
        System.out.println("   Inside second, x and y are: " + x + " " + y);       
    }
    
     public void third(int s, int t)
    {
        s = 3; t = 5;
        setXY( s, t);
        System.out.println("   Inside third, x and y are: " + x + " " + y);       
    }
    
    public void startUp()
    {
        int x = 1, y = 2;
        System.out.println("Inside startUp, x and y are: " + x + " " + y);
        first( x, y);
        System.out.println("After call to first, x and y are: " + x + " " + y);
        second( x, y);
        System.out.println("After call to second, x and y are: " + x + " " + y);
        third( x, y);
        System.out.println("After call to third, x and y are: " + x + " " + y);
    }
    
    public void setXY( int x, int y)
    {
        this.x = x;
        this.y = y;
    }
}