Java: An Introduction to Problem Solving and Programming (8th Edition)
8th Edition
ISBN: 9780134462035
Author: Walter Savitch
Publisher: PEARSON
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Question
Chapter 8, Problem 2PP
Program Plan Intro
Displaying right arrow and left arrow
Program Plan:
Filename: Test.java
- • Include the required header files.
- • Define the class “Test”.
- • Define main function.
- ○ Create an object for scanner.
- ○ Declare the character variable.
- ○ The “do-while” condition is used to get the user response to do the operation once again.
- ■ Create the objects “a1” and “b1” for “LeftArrow” and “RightArrow” classes.
- ■ Call the method “writeOutput” using both the objects.
- ■ Create the objects “a2” and “b2” for “LeftArrow” and “RightArrow” classes.
- ■ Call the method “writeOutput” using both the objects.
- ■ Create the objects “a3” and “b3” for “LeftArrow” and “RightArrow” classes.
- ■ Call the method “writeOutput” using both the objects.
- ■ Change the value of offset from 0 to 1 and call the method “writeOutput” using both the objects.
- ■ Call the method “setOffset” using both the objects.
- ■ Change the value of offset from 0 to 2 and call the method “writeOutput” using both the objects.
- ■ Call the method “setTail” using both the objects.
- ■ Change the value of offset from 3 to 10 and call the method “writeOutput” using both the objects.
- ■ Call the method “setBase” using both the objects.
- ■ Test the write offset values for both arrows by calling “writeOffset” method.
- ■ Test the return offset for both arrows by calling “getOffset” method.
- ■ Test the write tail for both arrows by calling “writeTail” method.
- ■ Test the return tail for both arrows by calling “getTail” method.
- ■ Test the write base for both arrows by calling “writeBase” method.
- ■ Test the return tail for both arrows by calling “getBase” method.
- ■ Reset the values and call “set” method.
- ■ Call the method “writeOutput” using both the objects.
- ■ Call the “drawHere” method using both the objects.
- ■ Reset the values and call “set” method.
- ■ Call the method “writeOutput” using both the objects.
- ■ Call the “drawHere” method using both the objects.
- ■ Reset the values and call “set” method.
- ■ Call the method “writeOutput” using both the objects.
- ■ Call the “drawHere” method using both the objects.
- ■ Finally display the two arrows on the output screen.
Filename: LeftArrow.java
- • Define the class “LeftArrow” extends from the “ShapeBase” class.
- ○ Declare the required variables.
- ○ Define the default constructor.
- ■ Call the “super” method.
- ■ Set the values.
- ○ Define the constructor with the arguments “theTail”, “theBase”.
- ■ Call the method “super” with an offset value.
- ■ Set the value.
- ■ Check the “theBase” value is less than 3.
- • Assign “base” is equal to 3.
- ■ Check the “theBase% 2” is equal to 0.
- • Assign “base” value is equal to “theBase + 1”.
- ■ Otherwise, assign the “base” is equal to “theBase”.
- • Assign “base” is equal to 3.
- ○ Define another constructor with the arguments “theTail”, “theBase”.
- ■ Call the method “super”.
- ■ Set the value.
- ■ Check the “theBase” value is less than 3.
- • Assign “base” is equal to 3.
- ■ Check the “theBase% 2” is equal to 0.
- • Assign “base” value is equal to “theBase + 1”.
- ■ Otherwise, assign the “base” is equal to “theBase”.
- ■ Define another constructor with the parameters “theTail”, “theBase”.
- • Assign “base” is equal to 3.
- ○ Define the “set” method with the arguments “newOffset”, newTail”, and “newBase”.
- ■ Call the method “super” with an offset value.
- ■ Set the value.
- ■ Check the “newBase” value is less than 3.
- • Assign “base” is equal to 3.
- ■ Check the “newBase% 2” is equal to 0.
- • Assign “base” value is equal to “theBase + 1”.
- ■ Otherwise, assign the “base” is equal to “newBase”.
- • Assign “base” is equal to 3.
- ○ Define the “setTail” method with an argument “newTail”.
- ■ Set the value.
- ○ Define the method “setBase” with an argument “newBase”.
- ■ Check the “newBase” value is less than 3.
- • Assign “base” is equal to 3.
- ■ Check the “newBase% 2” is equal to 0.
- • Assign “base” value is equal to “theBase + 1”.
- ■ Otherwise, assign the “base” is equal to “newBase”.
- • Assign “base” is equal to 3.
- ■ Check the “newBase” value is less than 3.
- ○ Define the “writeOutput()” method.
- ■ Call the “writeOffset()”, “writeTail ()”, and “writeBase()” methods.
- ○ Define the “writeOffset()” method.
- ■ Display the offset by calling the “getOffset()” method.
- ○ Define the “writeTail()” method.
- ■ Display the offset by calling the “getTail()” method.
- ○ Define the “writeBase()” method.
- ■ Display the offset by calling the “getBase()” method.
- ○ The method “getTail()” returns the “tail” value.
- ○ The method “getBase()” returns the “base” value.
- ○ Define the method “drawHere ()”.
- ■ Call the “drawTop()”, “drawTail()”, and “drawBottom()” methods.
- ○ Define the “drawTop ()” method.
- ■ Declare the variable “linecount” and assign the value of “getBase()” value divided by 2.
- ■ Declare the variable “numberOfSpaces” and calculate it.
- ■ Call the “skipSpaces()” method with a parameter “numberOfSpaces” value.
- ■ Display the “*” character.
- ■ Declare the “count” variable.
- ■ Declare the “insideWidth” with value 1.
- ■ The “for” condition is used to display the “*” character in left arrow shape.
- • Decrement the “numberOfSpaces” value by 2.
- • Call the “skipSpaces()” method with “numberOfSpaces” value.
- • Display the “*” character.
- • Call the “skipSpaces()” method with “insideWidth” value.
- • Display the “*” character.
- • Increment the “insideWidth” value by 2.
- ○ Define the “drawTial()” method.
- ■ Call the “skipSpaces()” method with “getOffset()” value.
- ■ Display the “*” character.
- ■ Declare and calculate the “insideWidth” value.
- ■ Call the “skipSpaces()” method with “insideWidth” value.
- ■ Declare the “count” variable.
- ■ The “for” condition is used to display the “*” character in left arrow shape.
- • Display the “*” character.
- ○ Define the “drawBottom()” method.
- ■ Declare the required variables and calculate them respectively.
- ■ The “for” condition is used to display the “*” character in left arrow shape.
- • Call the “skipSpaces()” method with “startOfLine” value.
- • Display the “*” character.
- • Call the “skipSpaces()” method with “inideWidth” value.
- • Display the “*” character.
- • Increment the “startOfLine” value by 2.
- • Decrement the “insideWidth” value by 2.
- ○ Define “skipSpaces()” method.
- ■ Display the space.
Filename: RightArrow.java
- • Define the class “RightArrow” extends from the “ShapeBase” class.
- ○ Declare the required variables.
- ○ Define the default constructor.
- ■ Call the “super” method.
- ■ Set the values.
- ○ Define the constructor with the arguments “theTail”, “theBase”.
- ■ Call the method “super” with an offset value.
- ■ Set the value.
- ■ Check the “theBase” value is less than 3.
- • Assign “base” is equal to 3.
- ■ Check the “theBase% 2” is equal to 0.
- • Assign “base” value is equal to “theBase + 1”.
- ■ Otherwise, assign the “base” is equal to “theBase”.
- • Assign “base” is equal to 3.
- ○ Define another constructor with the arguments “theTail”, “theBase”.
- ■ Call the method “super”.
- ■ Set the value.
- ■ Check the “theBase” value is less than 3.
- • Assign “base” is equal to 3.
- ■ Check the “theBase% 2” is equal to 0.
- • Assign “base” value is equal to “theBase + 1”.
- ■ Otherwise, assign the “base” is equal to “theBase”.
- ■ Define another constructor with the parameters “theTail”, “theBase”.
- • Assign “base” is equal to 3.
- ○ Define the “set” method with the arguments “newOffset”, newTail”, and “newBase”.
- ■ Call the method “super” with an offset value.
- ■ Set the value.
- ■ Check the “newBase” value is less than 3.
- • Assign “base” is equal to 3.
- ■ Check the “newBase% 2” is equal to 0.
- • Assign “base” value is equal to “theBase + 1”.
- ■ Otherwise, assign the “base” is equal to “newBase”.
- • Assign “base” is equal to 3.
- ○ Define the “setTail” method with an argument “newTail”.
- ■ Set the value.
- ○ Define the method “setBase” with an argument “newBase”.
- ■ Check the “newBase” value is less than 3.
- • Assign “base” is equal to 3.
- ■ Check the “newBase% 2” is equal to 0.
- • Assign “base” value is equal to “theBase + 1”.
- ■ Otherwise, assign the “base” is equal to “newBase”.
- • Assign “base” is equal to 3.
- ■ Check the “newBase” value is less than 3.
- ○ Define the “writeOutput()” method.
- ■ Call the “writeOffset()”, “writeTail ()”, and “writeBase()” methods.
- ○ Define the “writeOffset()” method.
- ■ Display the offset by calling the “getOffset()” method.
- ○ Define the “writeTail()” method.
- ■ Display the offset by calling the “getTail()” method.
- ○ Define the “writeBase()” method.
- ■ Display the offset by calling the “getBase()” method.
- ○ The method “getTail()” returns the “tail” value.
- ○ The method “getBase()” returns the “base” value.
- ○ Define the method “drawHere ()”.
- ■ Call the “drawTop()”, “drawTail()”, and “drawBottom()” methods.
- ○ Define the “drawTop ()” method.
- ■ Declare the variable “startOfLine” and assign the value of “getOffset()” plus “getTail()”.
- ■ Call the “skipSpaces()” method with a parameter “startOfLine” value.
- ■ Display the “*” character.
- ■ Declare the “linecount” and calculate it.
- ■ Declare the “count” variable.
- ■ Declare the “insideWidth” with value 1.
- ■ The “for” condition is used to display the “*” character in right arrow shape.
- • Call the “skipSpaces()” method with “startOfLine” value.
- • Display the “*” character.
- • Call the “skipSpaces()” method with “insideWidth” value.
- • Display the “*” character.
- • Increment the “insideWidth” value by 2.
- ○ Define the “drawTial()” method.
- ■ Call the “skipSpaces()” method with “getOffset()” value.
- ■ Declare the “count” variable.
- ■ The “for” condition is used to display the “*” character in right arrow shape.
- • Display the “*” character.
- • Calculate the “insideWidth”.
- • Call the “skipSpaces()” method with “insideWidth” value.
- • Display the “*” character.
- ○ Define the “drawBottom()” method.
- ■ Declare the required variables and calculate them respectively.
- ■ The “for” condition is used to display the “*” character in right arrow shape.
- • Call the “skipSpaces()” method with “startOfLine” value.
- • Display the “*” character.
- • Call the “skipSpaces()” method with “inideWidth” value.
- • Display the “*” character.
- • Decrement the “insideWidth” value by 2.
- • Call the “skipSpaces()” method with “startOfLine” value.
- • Display the “*” character.
- ○ Define “skipSpaces()” method.
- ■ Display the space.
Filename: ShapeInterface.java
Define the interface “SpaceInterface”.
- • Declare the “setOffset()” method.
- • Declare the “getOffset()” method.
- • Declare the “drawAt()” method.
- • Declare the “drawHere()” method.
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Chapter 8 Solutions
Java: An Introduction to Problem Solving and Programming (8th Edition)
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