Here some important strings methods with description are given bellow:
| methods | Description |
| int compareTo(String anotherString) | Compares two strings lexicographically. |
| int compareToIgnoreCase(String str) | Compares two strings lexicographically, ignoring case differences. |
| String concat(String str) | Concatenates the specified string to the end of this string. |
| char charAt(int index) | Returns the character at the specified index |
| int compareTo(Object o) | Compares this String to another Object. |
| boolean
contentEquals(StringBuffer sb) |
Returns true if and only if this String represents the same sequence of characters as the specified StringBuffer. |
| static String copyValueOf(char[] data, int offset, int count) | Returns a String that represents the character sequence in the array specified. |
| boolean endsWith(String suffix) | Tests if this string ends
with the specified suffix. |
| static String copyValueOf(char[] data) | Returns a String that
represents the character sequence in the array specified. |
| boolean equalsIgnoreCase(String
anotherString) |
Compares this String to another String, ignoring case considerations. |
| int hashCode() | Returns a hash code for this string. |
| int indexOf(int ch) | Returns the index within this string of
the first occurrence of the specified character. |
| int indexOf(int ch, int fromIndex) | Returns the index within this string of
the first occurrence of the specified character, starting the search at the
specified index. |
| int indexOf(String str) |
Returns the index within
this string of the first occurrence of the specified substring. |
| int indexOf(String str, int fromIndex) | Returns the index within
this string of the first occurrence of the specified substring, starting at
the specified index. |
| byte[] getBytes(String charsetName | Encodes this String into a
sequence of bytes using the named charset, storing the result into a new
byte array. |
| void getChars(int srcBegin, int srcEnd, char[] dst, int dstBegin) | Copies characters from this string into the destination character array. |
| boolean equals(Object anObject) | Compares this string to the
specified object. |
| String intern() | Returns a canonical representation for the string object. |
| int lastIndexOf(int ch) | Returns the index within this string of the last occurrence of the specified character. |
| String replace(char oldChar, char newChar) | Returns a new string resulting from replacing all occurrences of oldChar in this string with newChar. |
| String replaceAll(String regex, String replacement | Replaces each substring of this string that matches the given regular expression with the given replacement. |
| String replaceFirst(String regex, String replacement) | Replaces the first substring of this string that matches the given regular expression with the given replacement. |
| String[] split(String regex) | Splits this string around matches of the given regular expression. |
| String[] split(String regex, int limit) | Splits this string around matches of the given regular expression. |
| boolean startsWith(String prefix) | Tests if this string starts with the specified prefix. |
| boolean startsWith(String prefix, int toffset) | Tests if this string starts with the
specified prefix beginning a specified index. |
| int lastIndexOf(int ch, int fromIndex) | Returns the index within this string of the last occurrence of the specified character, searching backward starting at the specified index. |
| int lastIndexOf(String str) |
Returns the index within this string of
the rightmost occurrence of the specified substring. |
| int lastIndexOf(String str, int fromIndex) | Returns the index within this string of the last occurrence of the specified substring, searching backward starting at the specified index. |
| int length() | Returns the length of this string. |
| boolean matches(String regex) | Tells whether or not this string
matches the given regular expression. |
| boolean regionMatches(boolean ignoreCase, int toffset, String other, int ooffset, int len) | Tests if two string regions are equal. |
| boolean regionMatches(int toffset, String other, int ooffset, int len) | Tests if two string regions are equal. |
| CharSequence subSequence(int beginIndex, int endIndex) | Returns a new character sequence that is a subsequence of this sequence. |
| String substring(int beginIndex) |
Returns a new string that is a substring of this string. |
| static String valueOf(primitive data
type x) |
Returns the string representation of the passed data type argument. |
| String trim() | Returns a copy of the string, with
leading and trailing whitespace omitted. |
| String toUpperCase(Locale locale)
|
Converts all of the characters in this
String to upper case using the rules of the given Locale. |
| String toUpperCase() | Converts all of the characters in this
String to upper case using the rules of the default locale. |
| String toString() | This object (which is already a string!) is itself returned. |
| String toLowerCase(Locale locale) | Converts all of the characters in this
String to lower case using the rules of the given Locale. |
| String toLowerCase() | Converts all of the characters in this
String to lower case using the rules of the default locale. |
| char[] toCharArray() |
Converts this string to a new character
array. |
| String substring(int beginIndex, int endIndex) | Returns a new string that is a
substring of this string. |