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Learning Objectives Writing methods Using string methods Using if statements The Widget Class The inchesToFeet Method 1. Create a new BlueJ project...


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Learning Objectives Writing methods Using string methods Using if statements The Widget Class

 

The inchesToFeet Method

 

1. Create a new BlueJ project called Lab 3: (Project > New Project... ). In your

 

new project, create a class called Widget using the New Class button. 2. Clean out the starting scaffolding that BlueJ provides, leaving the class

 

documentation. Update that comment accordingly. Make sure you put your PID in

 

the @author tag. 3. In the Widget class, create a method called inchesToFeet in your class that

 

accepts a single int parameter representing a distance in inches and returns

 

a double. Write code in the method that computes and returns the equivalent

 

distance in feet. For example, if the parameter to the method is 66, the method

 

should return 5.5. 4. Add a JavaDoc comment above the method describing the purpose of the

 

method. Include an @param tag describing the parameter and an @return tag

 

describing the returned value. 5. Compile the Widget class and fix any errors. Then right click on the class in the

 

BlueJ project window and select new Widget() to create a Widget object. A red box

 

representing the object should appear in the bottom of the project window. 6. Now right click the object and select the inchesToFeet method to execute it. In

 

the window that appears, fill in a value for the parameter and press OK. Verify that

 

the correct value is returned in response. 7. Modify the code of the inchesToFeet method, adding an if statement so that if

 

the value passed to the method is negative, the method returns 0. Otherwise, the

 

method should return the computed feet as originally written. Make sure the

 

indentation of each statement is appropriate. 8. Test the method with a various parameter values to raise your confidence that

 

the method works as intended. The computeArea Method

 

1. In the Widget class, write a method called computeArea that accepts

 

two double parameters representing the length and width of a rectangle and

 

returns a double representing the rectangle's area. 2. 3. Create a new Widget object in the BlueJ project window and

 

test the computeArea method. For example, if the parameters are 3.7 and 2.88,

 

the returned value should be 10.656. Test it a few times with various parameter

 

values.

 

Add an appropriate JavaDoc comment above the computeArea method. The warpWord Method

 

1. Write another method called warpWord that accepts a String parameter

 

representing a word and returns a String result. 2. The method should return a string that is composed of the same characters as

 

the parameter, all in uppercase letters, and with all occurrences of the letter 'A'

 

replaced by the letter 'X'. For example, if the parameter passed to the method is

 

"Atlanta", the returned string should be "XTLXNTX". Use

 

the toUpperCase and replace methods of the String class to accomplish this. 3. Test the warpWord method as you did the other methods. When you fill in the

 

parameter value, remember to put double quotes around the word. Add

 

appropriate documentation to the method. The checkWordLength Method

 

1. Add one more method to the Widget class called checkWordLength that

 

accepts a String parameter, but doesn't return anything (use a return type of void).

 

The method should use an if statement to see if the word is more than 8 characters

 

long and print an appropriate message either way. For example, if the parameter is

 

"book", then the method should print

 

book is not a long word and if the parameter is "splendiforous" the method should print

 

splendiforous is a long word 2. Note the difference between returning a value and printing output! The purpose

 

of the checkWordLength method is to print output. The warpWord method

 

returns a string and doesn't print anything. 3. Add an appropriate JavaDoc comment above the checkwordLength method

 

after you've tested it.

 


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