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💻AP Computer Science A
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💻AP Computer Science A

FRQ 2 – Classes
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Unit 3: Class Creation
AP CS A FRQ Types & Units

Each FRQ type tests specific skills taught in particular units. Here's why certain units appear for each question type:

FRQFocusUnitsWhy
FRQ 1Methods and Control Structures1-2Tests method writing, loops, conditionals - foundational programming from Units 1-2
FRQ 2Classes3Tests class design, constructors, instance variables - all Unit 3 OOP content
FRQ 3Array/ArrayList4Tests 1D array and ArrayList traversal, manipulation - Unit 4 content
FRQ 42D Array4Tests 2D array traversal and manipulation - Unit 4 content

This mapping reflects College Board's exam structure - each FRQ type tests specific skills that are taught in particular units.

Practice FRQ 1 of 201/20

2. This question involves the TextCombiner class, which models a pair of strings that can be combined or wrapped within other strings. You will write the complete TextCombiner class, which contains a constructor and two methods.

TextCombiner objects are created by calls to a constructor with two parameters.

  • The first text segment to be stored (Precondition: The string is not null and has a length greater than 0)

  • The second text segment to be stored (Precondition: The string is not null and has a length greater than 0)

getCombinedText

Returns a string containing the two stored text segments combined according to specific rules.

  • If the last character of the first segment is equal to the first character of the second segment, the method returns the concatenation of the first segment and the substring of the second segment starting at index 1 (removing the duplicate character).

  • Otherwise, the method returns the concatenation of the first segment and the second segment.

  • The comparison of characters is case-sensitive.

A string representing the combined text.

insertInto

Returns a new string created by inserting the combined text into a wrapper string.

  • wrapper - a string into which the combined text will be inserted

  • The method first calls getCombinedText to obtain the combined string.

  • It calculates the insertion index as wrapper.length() / 2.

  • It returns a new string formed by the substring of wrapper from index 0 to the insertion index, followed by the combined string, followed by the rest of the wrapper.

The wrapper string with the combined text inserted in the middle.

Statement

Return Value

Explanation

TextCombiner t1 = new TextCombiner("dog", "gone");

t1 is initialized with "dog" and "gone".

t1.getCombinedText();

"dogone"

The last letter of "dog" ('g') matches the first letter of "gone" ('g'). They are merged.

t1.insertInto("1234");

"12dogone34"

"dogone" is inserted into "1234" at index 2 (4 / 2).

TextCombiner t2 = new TextCombiner("red", "car");

t2 is initialized with "red" and "car".

t2.getCombinedText();

"redcar"

The last letter of "red" ('d') does not match the first letter of "car" ('c'). They are concatenated normally.

t2.insertInto("[]");

"[redcar]"

"redcar" is inserted into "[]" at index 1 (2 / 2).

Write the complete TextCombiner class. Your implementation must meet all specifications and conform to the examples shown in the table.

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Free Response Question Practice

This practice environment simulates the AP AP Computer Science A Free Response Questions section. Here are some guidelines:

  • Read each question carefullybefore responding. Pay attention to command verbs like "identify," "explain," "analyze," or "evaluate."
  • Use the timer to practice time management. You can pause, restart, or hide the timer as needed.
  • Mark for Review if you want to come back to a question later.
  • Your responses are saved automatically as you type. You can also use the drawing tool for questions that require diagrams or graphs.
  • Use the toolbar for formatting options like bold, italic, subscript, and superscript.
  • Navigate between questions using the Previous and Next buttons at the bottom of the screen.

Tip: Answer all parts of each question. Partial credit is often available, so even if you are unsure, provide what you know.