test2

Class Utility2C

java.lang.Object

test2.Utility2C

public class Utility2C
extends Object

Method Summary

Modifier and Type	Method and Description
static boolean	areReversed(String s, String t) Returns true if the string t is equal to the string s in reverse, and false otherwise.
static char	last(String s) Returns the last character in the argument string.
static List<Character>	repeatedChars(String s) Returns a list of the characters that appear more than once in the string s.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

last

public static char last(String s)

Returns the last character in the argument string.

Parameters:

s - a string

Returns:

the last character in s

Preconditions:

s is not empty

areReversed

public static boolean areReversed(String s,
                                  String t)

Returns true if the string t is equal to the string s in reverse, and false otherwise. For example,

 Utility2C.areReversed("abcd", "dcba")
 

returns true.

Parameters:

s - a non-null string

t - a non-null string

Returns:

true if t is equal to the string s in reverse, and false otherwise

Throws:

IllegalArgumentException - if the length of s is not equal to the length of t

repeatedChars

public static List<Character> repeatedChars(String s)

Returns a list of the characters that appear more than once in the string s. The returned list contains no duplicate characters. For example:

 Utility2C.repeatedChars("hi")        returns the empty list
 Utility2C.repeatedChars("EECS")      returns the list ['E']
 Utility2C.repeatedChars("EECS2030")  returns the list ['E', '0']
 

Parameters:

s - a non-null string

Returns:

a list of the characters that appear more than once in the string s