Question

Step 1: Declare a base class called Coin that contains a Boolean data element called face, and a random generator to fill the face element with a Boolean value (true or false). True = heads, false = tails. The class needs a default constructor, a method to flip the coin, a method to return the face element, and a toString to display “Heads” if the face is true and “Tails” if not.

Step 2: Declare a subclass of Coin that describes what kind of coin it is and what value it represents. It needs a constructor that receives its value, a method that returns its value, and a toString method that returns a string with the face description (“Heads” or “Tails”) and its monetary value.

Step 3: Design and code a driver program that creates an array of 7 coins, assigns each a random coin value (use the following values: 1,5,10,25,50,100), flips them all, then sums the values of only the coins that are “Heads”, and finally displays all the coins and the sum.

Step 4: Using the JAVADOC format, document the program and every method (main is a method, not a constructor) as displayed in the sample programs found in the downloaded files for classroom activity. Completeness, accuracy, and spelling count.

Answer 1

import java.util.Random;

/**
* Coin class
*/
class Coin{
//face variable
private boolean face;
//Constructor that takes face
Coin(boolean face){
this.face = face;
}
//Populate face with random value, heads/tails
Coin(){
Random r = new Random();
face = r.nextInt(2)==1;
}

/**
* Returns face of the coin
* @return
*/
public boolean getFace(){
return this.face;
}

/**
* Flips the coin
*/
public void flip(){
this.face = !this.face;
}

/**
* Returns Heads or Tails of the coin
* @return
*/
public String toString(){
if(face){
return "Heads";
}
else{
return "Tails";
}
}
}

/**
* This class extends Coin class
*/
class MyCoin extends Coin{
//Value of the coin
private int value;
  
//Constructor that takes value of the coin
MyCoin(int value){
this.value =value;
}

/**
* Returns the value of the coin
* @return
*/
public int getValue(){
return value;
}

public String toString(){
return value+" "+super.toString();
}
}

class Main{
public static void main(String[] args) {
//Initiailze random variable
Random r = new Random();
//Initialize array of 7 MyCoins
MyCoin coins[] = new MyCoin[7];
//Populate them with random value
for(int i=0;i<7;i++){
coins[i] = new MyCoin(r.nextInt(10)+1);
}
//Flipping all the coins
for(int i=0;i<7;i++){
coins[i].flip();
}
int ans = 0;
System.out.println("Coins are : ");
//Print the coins and find total value of all Head coins
for(int i=0;i<7;i++){
System.out.println(coins[i]);
if(coins[i].getFace()){
ans+=coins[i].getValue();
}
}
System.out.println(ans);
}
}
OUTPUT :

THANK YOU!!!!