Strings

append is a method in the StringBuffer class

• True

• False

append is a method in the String class

• true

• false

You cannot call a literal string's methods, as in "Hello".equals(str).

• True

• False

Given

String word1 = "at";

String word2 = "Cat";

what is returned by word2.compareTo(word1)?

• A negative integer

• false

• true

• A positive integer

The Character class contains the static method boolean isUpperCase(char ch).

• True

• False

What happens if str.length() is 8 and you call str.charAt(8)?

• charAt returns the random character that happens to be stored after the string.

• You get a StringIndexOutOfBoundsException.

• charAt returns the last character of str.

• charAt returns -1.

The length method returns 0 for an empty string.

• True

• False

The length method returns null for an empty string.

• True

• False

If String str = "ABCDE", what string is returned by str.substring(1,3)?

• "C"

• 
  "CDE"

• "BC"

• 
  "BCD"

What happens if str.length() is 23 and you call str.charAt(23)?

•  

  charAt returns the last character of str.

• charAt returns the random character that happens to be stored after the string.

• You get a StringIndexOutOfBoundsException.

• charAt returns -1.