The class String includes various Java String methods or functions for examining individual characters in a string, for string comparison, for searching strings, for creating a copy of string, for extracting sub strings, and for converting string to lowercase or uppercase.
Java String Methods
The following table will show you the list of Java String Method available in String Class
| Modifier and Type | Java String Methods | Description of the java string methods |
|---|---|---|
| char | chartAt(int index) | It returns the Character at specified index position |
| int | codePointAt(int index) | It returns the Unicode of the Character at specified index position |
| int | codePointBefore(int index) | It returns the Unicode of the Character before the specified index position |
| int | codePointCount(int start_index, int end_index) | It returns the Unicode of the Character at specified index position |
| int | comapreTo(String str) | This method will compare two string lexicographical |
| int | comapreToIgnoreCase(String str) | This method will compare two string lexicographical. While comparing,this method will ignore the case difference |
| String | concat(String str) | This method will help you to Join the user specified string to the end of the string and return the new string |
| boolean | contains(CharSequence s) | This method will return TRUE if and only if the string contains the user specified sequence of characters |
| boolean | contentEquals(CharSequence s) | This method will compare the string with the user specified sequence of characters |
| boolean | contentEquals(StringBuffer sb) | This method will compare the string with the user specified StringBuffer |
| Static String | copyValueOf(char[] anCharArray) | This method return the string that represents the character sequence in the specified array. |
| Static String | copyValueOf(char[] anCharArray, int offset, int count) | This method return the string that represents the character sequence in the specified array starting at offset until it reaches specified count. |
| boolean | endsWith(String suffix) | It will test whether the string is ending with the suffix that we specified or not |
| boolean | equals(Object anObject) | It will compare this string with the user specified object |
| Boolean | equalsIgnoreCase(String another_String) | It will compare this string with the user specified string (another_String). Note, while comparing it will ignore the case sensitivity. |
| static String | format (String format, Object.. args) | It will return a formatted string using the user specified format and arguments |
| static String | format (locale l, String format, Object.. args) | It will return a formatted string using the user specified locale, format and arguments |
| byte[] | getBytes() | It will convert the string into sequence of bytes using the platform default charset and store it in a byte array |
| byte[] | getBytes(Charset charset) | It will convert the string into sequence of bytes using the user specified charset and store it in a byte array |
| byte[] | getBytes(String charset_Name) | It will convert the string into sequence of bytes using the named charset and store it in a byte array |
| int | hashCode() | It will return the Hash code of the string |
| int | indexOf(int ch) | It returns the index position of the first occurrence of a specified character. It will return -1, if the specified character is not found |
| int | indexOf(int ch, int Starting_Index) | It returns the index position of the first occurrence of a specified character. It will return -1, if the specified character is not found |
| int | indexOf(String str) | It returns the index position of the first occurrence of a specified sub string. It will return -1, if the specified string is not found |
| int | indexOf(String str, int Start_Index) | It returns the index position of the first occurrence of a specified sub string. It will return -1, if the specified string is not found |
| String | intern() | This function will return the canonical representation for the String Object |
| boolean | isEmpty() | This function will return TRUE if the length of this string is Zero |
| int | lastIndexOf(int ch) | It returns the index position of the last occurrence of a specified character. It will return -1, if the specified character is not found |
| int | lastIndexOf(int ch, int End_Index) | It returns the index position of the last occurrence of a specified character. It will return -1, if the specified character is not found |
| int | lastIndexOf(String str) | It returns the index position of the last occurrence of a specified character. It will return -1, if the specified character is not found |
| int | lastIndexOf(String str, int End_Index) | It returns the index position of the last occurrence of a specified character. It will return -1, if the specified character is not found |
| int | length() | This function will return the length of this string |
| boolean | matches(String regexp) | This function will tell whether this string matches with user specified regular expression or not |
| int | offsetByCodePoints(int index, int codePointOffset) | It will return the index within the string that is offset of a given index by codePointOffset code points |
| boolean | regionMatches(int toffset, String other, int offset, int len) | It will test if two string regions are equal or not |
| boolean | regionMatches(boolean ignorecase, int toffset, String other, int offset, int len) | It will test if two string regions are equal or not |
| String | replace(char Old_Character, char New_Character) | It will search for specified character and then replace all the occurrences of Old_Character with new New_Character |
| String | replace(CharSequence Old_sequence, CharSequence New_sequence) | It will search for specified substring and then replace all the occurrences of Old_sequence substring with new New_sequence substring |
| String | replaceAll(String regexp, String replacement) | It will search for specified regular expression and then replace all the occurrences of regular expression substring with the given replacement substring |
| String | replaceFirst(String regexp, String replacement) | It will search for specified regular expression and then replace first occurrence of regular expression substring with the given replacement substring |
| String[] | split(String regex) | It will Split the string into Array of Substrings based on the separator we specified |
| String[] | split(String regex, int limit) | It will Split the string into Array of Substrings based on the separator we specified |
| boolean | startsWith(String prefix) | It will test whether the string is starting with the prefix that we specified or not |
| boolean | startsWith(String prefix, int limit) | It will test whether the substring of this string is starting with the prefix that we specified or not |
| CharSequence | subsequent(int Starting_Index, int End_Index) | It will return new sequence that is subsequent of the given sequence |
| String | substring(int Starting_Index) | It will extract the characters from a string based on the specified indices |
| String | substring(int Starting_Index, int End_Index) | It will extract the characters from a string based on specified Starting position and end position |
| char[] | toCharArray() | It will convert the given string into Array of Characters or Character Array |
| int | toLowerCase() | It will convert the given string into Lowercase letters using default locale |
| String | toLowerCase(Locale locale) | It will convert the given string into Lowercase letters, by considering user specified locale |
| String | toString() | It will convert the given value into String Object |
| String | toUpperCase() | It will convert the given string into Uppercase letters |
| String | toUpperCase(Locale locale) | It will convert the given string into Uppercase letters, by considering host environment’s current locale |
| string | trim() | It will remove the white spaces from both ends |
| static String | ValueOf(boolean number) | Returns the string representation of Boolean value |
| static String | ValueOf(char character) | Returns the string representation of char |
| static String | ValueOf(char[] myArray) | Returns the string representation of a character array |
| static String | ValueOf(char[] myArray, int Offset, int count) | Returns the string representation of a subset character array |
| static String | ValueOf(double number) | Returns the string representation of Double value |
| static String | ValueOf(float number) | Returns the string representation of Float value |
| static String | ValueOf(int number) | Returns the string representation of Integer value |
| static String | ValueOf(long number) | Returns the string representation of Long value |
| static String | ValueOf(Object obj) | Returns the string representation of an Object |
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