Flash cards
Review the key moves
1/3
Core idea
What is the main idea behind Java String Methods?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
1Quick choice
Which statement best captures the main point of this lesson?
All String Methods
The String class has a set of built-in methods that you can use on strings.
| Method | Description | Return Type |
|---|---|---|
| charAt() | Returns the character at the specified index (position) | char |
| codePointAt() | Returns the Unicode of the character at the specified index | int |
| codePointBefore() | Returns the Unicode of the character before the specified index | int |
| codePointCount() | Returns the number of Unicode values found in a string. | int |
| compareTo() | Compares two strings lexicographically | int |
| compareToIgnoreCase() | Compares two strings lexicographically, ignoring case differences | int |
| concat() | Appends a string to the end of another string | String |
| contains() | Checks whether a string contains a sequence of characters | boolean |
| contentEquals() | Checks whether a string contains the exact same sequence of characters of the specified CharSequence or StringBuffer | boolean |
| copyValueOf() | Returns a String that represents the characters of the character array | String |
| endsWith() | Checks whether a string ends with the specified character(s) | boolean |
| equals() | Compares two strings. Returns true if the strings are equal, and false if not | boolean |
| equalsIgnoreCase() | Compares two strings, ignoring case considerations | boolean |
| format() | Returns a formatted string using the specified locale, format string, and arguments | String |
| getBytes() | Converts a string into an array of bytes | byte[] |
| getChars() | Copies characters from a string to an array of chars | void |
| hashCode() | Returns the hash code of a string | int |
| indexOf() | Returns the position of the first found occurrence of specified characters in a string | int |
| intern() | Returns the canonical representation for the string object | String |
| isEmpty() | Checks whether a string is empty or not | boolean |
| join() | Joins one or more strings with a specified separator | String |
| lastIndexOf() | Returns the position of the last found occurrence of specified characters in a string | int |
| length() | Returns the length of a specified string | int |
| matches() | Searches a string for a match against a regular expression, and returns the matches | boolean |
| offsetByCodePoints() | Returns the index within this String that is offset from the given index by codePointOffset code points | int |
| regionMatches() | Tests if two string regions are equal | boolean |
| replace() | Searches a string for a specified value, and returns a new string where the specified values are replaced | String |
| replaceAll() | Replaces each substring of this string that matches the given regular expression with the given replacement | String |
| replaceFirst() | Replaces the first occurrence of a substring that matches the given regular expression with the given replacement | String |
| split() | Splits a string into an array of substrings | String[] |
| startsWith() | Checks whether a string starts with specified characters | boolean |
| subSequence() | Returns a new character sequence that is a subsequence of this sequence | CharSequence |
| substring() | Returns a new string which is the substring of a specified string | String |
| toCharArray() | Converts this string to a new character array | char[] |
| toLowerCase() | Converts a string to lower case letters | String |
| toString() | Returns the value of a String object | String |
| toUpperCase() | Converts a string to upper case letters | String |
| trim() | Removes whitespace from both ends of a string | String |
| valueOf() | Returns the string representation of the specified value | String |