AP CS A REFERENCE SHEET

What does the method 'int length()' in the String class return?

• The number of characters in a String object

• The number of words in a String object

• The number of vowels in a String object

• The number of spaces in a String object

Which method in the Math class returns the nonnegative square root of a double value?

• static double sqrt(double x)

• static double pow(double base, double exponent)

• static double abs(double x)

• static double random()

What is the purpose of the 'boolean equals(Object other)' method in the String class?

• To check if two strings have the same sequence of characters

• To compare the length of two strings

• To convert a string to a boolean value

• To find the index of a character in a string

Which method in the ArrayList class is used to append an object to the end of the list?

• boolean add(E obj)

• void add(int index, E obj)

• E set(int index, E obj)

• E remove(int index)

What does the 'static int parseInt(String s)' method in the Integer class do?

• Returns the String argument as an int

• Converts an int to a String

• Parses a String to a double

• Checks if a String can be converted to an int

Which method in the Scanner class returns the next line of text as a String?

• String nextLine()

• String next()

• int nextInt()

• double nextDouble()

What does the 'E get(int index)' method in the ArrayList class return?

• The element at position index in the list

• The size of the list

• The index of the element in the list

• The last element in the list