Question

JAVA 1 PROGRAMMING QUESTION

In this program you will be writing a class that will contain some methods. These will be regular methods (not static methods), so the class will have to be instantiated in order to use them.
The class containing the main method will be provided and you will write the required methods and run the supplied class in order to test those methods.

? Specifications

• There are two separate files in this program. The class containing the main method is supplied, and you will write a new class containing the methods you will write.

? The code for the testing class is given below. In order to test the code you write, you will need to rename this file as you have all of your program files, as outlined above. You will need to change the calls to the methods to reflect the class where your methods are located. Do not modify the logic in this file to make it fit your methods. Part of this problem is to meet the specifications of the test program.

• Name the file (and class) you will create to hold the methods, MethodPractice (with the addition of your name data as above). This is the file that will have all of the methods other than the main method.

The Methods to Write

• In the file called MethodPractice you will write the following methods:

  • displayLine()

    • This method will not accept arguments nor will it return any values.
    • You may use the illustrated “Basic void Method” up above.
    • This method simply displays a line by using: System.out.println("--------------------");
    • Make sure your method displays 20 dashes.

  • displayMessage()

    • This method will accept a String as an argument, but will not return a value.
    • This method will accept a String message and simply display that exact message on the screen.

  • sumNumbers()

    • This method will accept two integers as arguments.
    • This method will add those two integers together and return the sum.

  • isGreater()

    • This method will accept two integers as arguments.
    • This method will use if and else to test the two numbers to see if the first one is greater than or equal to the second.
    • If the first number is greater than or equal to the second, the method will return a boolean true. If the first number is not greater than or equal to the second number, then the method will return a boolean false.
    • This method could use two return statements. However, use only one return statement at the end of the method. You can accomplish this by setting a variable to one boolean state of true or false, and then returning that variable.

  • setBulb()

    • This method will accept a boolean argument, but will not return a value.
    • Based on a received boolean value, this method will use if and else to display a message of either “The bulb is now on.,” or “The bulb is now off.”

The Instance Variables

? Make all instance variables in the MethodPractice class private.

• There are instance variables at the beginning of the MethodsPractice class. You may change those, but you will need to be consistent with the method calling from the main method in the MethodTest class.

The MethodTest.java Class

? Be sure to rename this file as you do all of your files, as outlined above, and upload this file along with the MethodPractice file. You will also need to modify the method calls to match your class name for the MethodPractice class.

• Below is the class by which your methods will be tested. It contains the main method with calls to each of the methods you are will write in the MethodPractice class. Use this class to test your methods.
• Remember to make the necessary modifications mentioned above.

Answer 1

MethodPractice.java

public class MethodPractice {
  
public void displayLine()
{
System.out.println("--------------------");
}
  
public void displayMessage(String message)
{
System.out.println(message);
}
  
public int sumNumbers(int first, int second)
{
return (first + second);
}
  
public boolean isGreater(int first, int second)
{
boolean result;
if(first >= second)
result = true;
else
result = false;
return result;
}
  
public void setBulb(boolean val)
{
if(val)
displayMessage("The bulb is now on.");
else
displayMessage("The bulb is now off.");
}
}

MethodTest.java (Main class)

public class MethodTest {
  
public static void main(String[] args)
{
MethodPractice practice = new MethodPractice();
practice.displayLine();
practice.displayMessage("WELCOME TO METHOD PRACTICE TEST\n");
int sum = practice.sumNumbers(67, 99);
practice.displayMessage("The sum of 67 and 99 is = " + sum);
boolean greater = practice.isGreater(67, 99);
practice.setBulb(greater);
}
}

Note: As there are no instance variables mentioned in the question, it couldn't be answered. In case there are any, please add "private" before the variable declarations. For eg.: private String name; OR private int number;

************************************************************** SCREENSHOT *************************************************************