Appendix | Java Fundamentals

Lesson 3: Control Flow

Activity 6: Controlling the Flow of Execution Using Conditionals

Solution:

Create a class named Salary and add main() method:

public class Salary {
   public static void main(String args[]) {

Initialize two variables workerhours and salary.
```
int workerhours = 10; 
double salary = 0;
```
In the if condition, check whether the working hours of the worker is below the required hours. If the condition holds true, then the salary should be (working hours * 10).
```
if (workerhours <= 8 ) 
salary = workerhours*10;
```
Use the else if statement to check if the working hours lies between 8 hours and 12 hours. If that is true, then the salary should be calculated at $10 per hour for the first eight hours and the remaining hours should be calculated at $12 per hour.
```
else if((workerhours > 8) && (workerhours < 12)) 
salary = 8*10 + (workerhours - 8) * 12;
```

Use the else block for the default of $160 (additional day's salary) per day.

else
    salary = 160;
System.out.println("The worker's salary is " + salary);
}
}

Activity 7: Developing a Temperature System

Solution:

Declare two strings, temp and weatherWarning, and then initialize temp with either High, Low, or Humid.

public class TempSystem
{
    public static void main(String[] args) {
        String temp = "Low";
        String weatherWarning;

Create a switch statement that checks the different cases of temp, and then initialize the variable weatherWarning to appropriate messages for each case of temp (High, Low, Humid).

switch (temp) { 
        case "High": 
            weatherWarning = "It's hot outside, do not forget sunblock."; 
            break; 
        case "Low": 
            weatherWarning = "It's cold outside, do not forget your coat."; 
            break; 
        case "Humid": 
            weatherWarning = "The weather is humid, open your windows."; 
            break;

In the default case, initialize weatherWarning to "The weather looks good. Take a walk outside".
```
default: 
  weatherWarning = "The weather looks good. Take a walk outside"; 
  break;
```
After you complete the switch construct, print the value of weatherWarning.
```
} 
        System.out.println(weatherWarning); 
    }
}
```

Run the program to see the output, it should be similar to:

It's cold outside, do not forget your coat.

Full code is as follows:

public class TempSystem
{
    public static void main(String[] args) {
        String temp = "Low";
        String weatherWarning;
            switch (temp) { 
        case "High": 
            weatherWarning = "It's hot outside, do not forget sunblock."; 
            break; 
        case "Low": 
            weatherWarning = "It's cold outside, do not forget your coat."; 
            break; 
        case "Humid": 
            weatherWarning = "The weather is humid, open your windows."; 
            break; 
        
        default: 
            weatherWarning = "The weather looks good. Take a walk outside"; 
            break; 
        } 
        System.out.println(weatherWarning); 
    }
}

Activity 8: Implementing the for Loop

Solution:

Right-click the src folder and select New | Class.
Enter PeachBoxCounter as the class name, and then click OK.
Import the java.util.Scanner package:
```
import java.util.Scanner;
```

In the main() enter the following:

public class PeachBoxCounter
{
static Scanner sc = new Scanner(System.in);
public static void main(String[] args) {
System.out.print("Enter the number of peaches picked: ");
int numberOfPeaches = sc.nextInt();
for (int numShipped = 0; numShipped < numberOfPeaches; numShipped += 20)      {
System.out.printf("shipped %d peaches so far\n", numShipped);
}
}
}

Activity 9: Implementing the while Loop

Solution:

Right-click the src folder and select New | Class.
Enter PeachBoxCounters as the class name, and then click OK.
Import the java.util.Scanner package:
```
import java.util.Scanner;
```

In the main() enter the following:

public class PeachBoxCounters{
static Scanner sc = new Scanner(System.in);
public static void main(String[] args) {
    System.out.print("Enter the number of peaches picked: ");
    int numberOfPeaches = sc.nextInt();
    int numberOfBoxesShipped = 0;

    while (numberOfPeaches >= 20) {
        numberOfPeaches -= 20;
        numberOfBoxesShipped += 1;
        System.out.printf("%d boxes shipped, %d peaches remaining\n", 
                numberOfBoxesShipped, numberOfPeaches);
    }
}
}

Activity 10: Implementing Looping Constructs

Solution:

Import the packages that are required to read data from the user.

import java.util.Scanner;
public class Theater {
public static void main(String[] args)

Declare the variables to store the total number of seats available, remaining seats, and tickets requested.
```
{
int total = 10, request = 0, remaining = 10;
```
Within a while loop, implement the if else loop that checks whether the request is valid, which implies that the number of tickets requested is less than the number of seats remaining.
```
while (remaining>=0)
{
System.out.println("Enter the number of tickets");
Scanner in = new Scanner(System.in);
request = in.nextInt();
```
If the logic in the previous step is true, then print a message to denote that the ticket is processed, set the remaining seats to the appropriate value, and ask for the next set of tickets.
```
if(request <= remaining)
{
System.out.println("Your " + request +" tickets have been procced. Please pay and enjoy the show.");
remaining = remaining - request;
request = 0;
}
```
If the logic in step 3 is false, then print an appropriate message and break out of the loop:
```
else
{
System.out.println("Sorry your request could not be processed");
break;
}
}
}
}
```

Activity 11: Continuous Peach Shipment with Nested Loops

Solution:

Right-click the src folder and select New | Class.
Enter PeachBoxCounter as the class name, and then click OK.
Import the java.util.Scanner package:
```
import java.util.Scanner;
```

In the main() enter the following:

public class PeachBoxCount{    
static Scanner sc = new Scanner(System.in);
public static void main(String[] args) {
    int numberOfBoxesShipped = 0;
    int numberOfPeaches = 0;
    while (true) {
        System.out.print("Enter the number of peaches picked: ");
        int incomingNumberOfPeaches = sc.nextInt();
        if (incomingNumberOfPeaches == 0) {
            break;
        }
        numberOfPeaches += incomingNumberOfPeaches;
        while (numberOfPeaches >= 20) {
            numberOfPeaches -= 20;
            numberOfBoxesShipped += 1;
            System.out.printf("%d boxes shipped, %d peaches remaining\n",
                    numberOfBoxesShipped, numberOfPeaches);
        }
    }
}
}

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Java Fundamentals

By : Gazihan Alankus , Rogério Theodoro de Brito , Basheer Ahamed Fazal , Isola, Miles Obare

Java Fundamentals

By: Gazihan Alankus , Rogério Theodoro de Brito , Basheer Ahamed Fazal , Isola, Miles Obare

Overview of this book

Lesson 3: Control Flow

Activity 6: Controlling the Flow of Execution Using Conditionals

Activity 7: Developing a Temperature System

Activity 8: Implementing the for Loop

Activity 9: Implementing the while Loop

Activity 10: Implementing Looping Constructs

Activity 11: Continuous Peach Shipment with Nested Loops

Java Fundamentals

By : Gazihan Alankus , Rogério Theodoro de Brito , Basheer Ahamed Fazal , Isola, Miles Obare

Java Fundamentals

By: Gazihan Alankus , Rogério Theodoro de Brito , Basheer Ahamed Fazal , Isola, Miles Obare

Overview of this book

Lesson 3: Control Flow

Activity 6: Controlling the Flow of Execution Using Conditionals

Activity 7: Developing a Temperature System

Activity 8: Implementing the for Loop

Activity 9: Implementing the while Loop

Activity 10: Implementing Looping Constructs

Activity 11: Continuous Peach Shipment with Nested Loops

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