crehwinkel@frhsd.com ap-exam-review-set3

Description:AP Exam Review Set 3

How to use a for loop with a String

If the input is named str (and it will be, most of the time), here's a simple for loop that goes through all characters and checks an individual character using str.substring(i, i+1).
for (int i = 0; i < str.length(); i++)
{
  if (str.substring(i, i+1).equals("A"))
  {
    // do something when we find the character 'A' inside str
    // note, substring returns String and thus compares using .equals
  }
}
Alternately, you could also do this inside the loop (using charAt instead of substring)
for (int i = 0; i < str.length(); i++)
{
  if (str.charAt(i) == 'A')
  {
    // do something when we find the character 'A' inside str
    // note, charAt returns char and thus compares using ==
  }
}

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