Practice Test GeeksAP CSA - Advanced Placement Computer Science A Practice Test
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String Manipulation and 2D Arrays Flashcards

6 cards from real AP CSA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Which method returns the number of characters in a String in Java?

    Answer: length()

    The String.length() method returns the number of characters (including spaces) in the string.

  2. What does `str.substring(2, 5)` return for `str = "ABCDEFG"`?

    Answer: "CDE"

    substring(2,5) returns characters from index 2 up to but not including index 5, giving 'C','D','E' → "CDE".

  3. What does `str.charAt(0)` return for `str = "Hello"`?

    Answer: 'H'

    charAt(0) returns the char at index 0, which is 'H' — a primitive char, not a String.

  4. How do you compare two Strings for equal content in Java?

    Answer: str1.equals(str2)

    The equals() method compares String content; using == compares object references, which may give unexpected results for Strings.

  5. What does `str.indexOf("lo")` return for `str = "Hello"`?

    Answer: 3

    indexOf returns the starting index of the first occurrence of the substring; "lo" starts at index 3 in "Hello".

  6. What is the result of `"Hello" + " " + "World"`?

    Answer: "Hello World"

    The + operator concatenates Strings in Java, combining "Hello", " ", and "World" into "Hello World".