1. ./Chicken.java
2. ./CoinFlip.java
3. ./CoinFlipUsingBoolean.java
4. ./NotSoRandom.java
5. ./NotTheChickenClass.java

/**
 * A Java class that represents a Chicken. The state of the chicken is its
 * name, height and weight.
 * 
 * @author Sara Sprenkle
 */
public class Chicken {

    // ------------ INSTANCE VARIABLES -------------------
    private String name;
    
    /** the height of the chicken in centimeters */
    private int height;
    
    /** the weight of the chicken in pounds */
    private double weight;

    /**
     * Create a new Chicken object with the charactistics as specified by the
     * parameters.
     * @param height the height of the chicken in centimeters
     * @param weight the weight of the chicken in pounds
     */
    public Chicken(String name, int height, double weight) {
        this.name = name;
        this.height = height;
        this.weight = weight;
    }

    /**
     * Default name: "Bubba"; height and weight specified by parameters
     * @param height the height of the chicken in centimeters
     * @param weight the weight of the chicken in pounds
     */
    public Chicken(int height, double weight) {
        // if the user doesn't specify a name, let's make it Bubba
        this("Bubba", height, weight);
    }
    
	//
	// ----------- GETTER METHODS ------------
	// (also Accessor methods)

    /**
     * @return the height of the chicken, in centimeters
     */
    public int getHeight() {
        return height;
    }
    
    /**
     * @return the weight of the chicken, in pounds
     */
    public double getWeight() {
        return weight;
    }

    /**
     * @return the name of the chicken
     */
    public String getName() {
        return name;
    }

	//
	// ------------- MUTATORS -----------
	//

    /**
     * Feeds the chicken
     */
    public void feed() {
        // Better: create constants for these increment values
        weight += .3;
        height += 1;
    }
	
	//
	// ------------- SETTERS ----------
	//

    /**
     * @param n
     *            the name of the chicken
     */
    public void setName(String n) {
        name = n;
    }
    
    /**
     * @param h
     *            the height of the chicken, in cm
     */
    public void setHeight(int h) {
        height = h;
    }
    
    /**
     * @param w
     *            the weight of the chicken, in pounds
     */
    public void setWeight(double w) {
        weight = w;
    }
    
    /**
     * This method is private.  It is accessible by the Chicken class
     * but NOT by other classes.
     */
    private void privateMethod() {
        System.out.println("I am private!");
    }
    

    /**
     * @param args
     *            the command-line arguments
     */
    public static void main(String[] args) {        
        // "Fred", weight: 2.0, height: 38
        // "Sallie Mae", weight: 3.0, height: 45
        // "Momma", weight: 6.0, height: 83
        int fredHeight = 38;
        Chicken chicken = new Chicken("Fred", fredHeight, 2.0);
        
        chicken.feed();
        
        int newFredHeight = chicken.getHeight();
        System.out.println(chicken.getName() + " is now " + newFredHeight + " cm tall.");
        
        chicken.feed();
        
        System.out.println("He's a growing boy at " + chicken.getHeight() + " cm tall.");
        
        // Make chicken Bubba, weight: 4.0, height: 50
        
    }
}

import java.util.Random;

/**
 * This class generates heads or tails at random.
 *
 * @author CSCI209 Class
 */ 
public class CoinFlip {  
  
   /**
    * Called when user runs 
    *  java CoinFlip
    */
    public static void main(String[] args) {
        Random coin = new Random();
        
        int side = coin.nextInt(2);
        
        if( side == 0 ) {
            System.out.println("TAILS!");
        } else {
            System.out.println("HEADS!");
        }
        
    }
}

import java.util.Random;

/**
 * This class generates heads or tails at random.
 *
 * @author CSCI209 Class
 */
public class CoinFlipUsingBoolean {  
  
   /**
    * Called when user runs 
    *  java CoinFlipUsingBoolean
    */
    public static void main(String[] args) {
        Random random = new Random();
        
        if ( random.nextBoolean() ) {
            System.out.println("HEADS!");   
        } else {
            System.out.println("TAILS!");   
        }
        
    }
}

import java.util.*;

/**
 * Random number generation is not-so-random.
 * A starting point for learning more: https://en.wikipedia.org/wiki/Pseudorandom_number_generator
 * @author Sara Sprenkle
 */
public class NotSoRandom {
    public static void main(String args[]) {
        System.out.println("This program prints out random integers using");
        System.out.println("two different random number generators");
        
        System.out.println("\nNo hard-coded seed (Time-based seed):");
        
        Random notSeededNumGen = new Random();

        for( int i=0; i < 5; i++) {
            System.out.println(notSeededNumGen.nextInt());   
        }
        
        System.out.println("\nUses a seed.  So, the same 5 numbers");
        System.out.println("will print out each time you run the program.");
        
        Random seededNumGen = new Random(100);
        
        for( int i=0; i < 5; i++) {
            System.out.println(seededNumGen.nextInt());   
        }
        
        System.out.println("\nPlease rerun the program to see what I mean.");
    }
}

/**
 * Demonstrates how we can create Chicken objects 
 * and call its public methods, but
 * we can't call the Chicken's private methods.
 * @author Sara Sprenkle
 */ 
public class NotTheChickenClass {
    
    public static void main(String[] args) {
    
        Chicken myChicken = new Chicken("Fred", 10, 2);
        
        myChicken.feed();
        
        // this will result in a compiler error:
        myChicken.privateMethod();
    
    }

}