{"id":111,"date":"2019-01-20T20:56:37","date_gmt":"2019-01-20T20:56:37","guid":{"rendered":"https:\/\/www.kindsonthegenius.com\/java\/?p=111"},"modified":"2019-03-02T04:38:23","modified_gmt":"2019-03-02T04:38:23","slug":"23-java-string-methods","status":"publish","type":"post","link":"https:\/\/www.kindsonthegenius.com\/java\/23-java-string-methods\/","title":{"rendered":"Java – String Methods"},"content":{"rendered":"

In this lesson, we are going to learn about various String methods. If you would need to manipulate strings, then these methods are handy.<\/p>\n

 <\/p>\n

Now, we are going to learn about six categories of methods<\/p>\n

    \n
  1. Indexing Methods<\/a><\/li>\n
  2. Comparison Methods<\/a><\/li>\n
  3. Modifier Methods<\/a><\/li>\n
  4. Case Modifiers Methods<\/a><\/li>\n
  5. Substring Methods<\/a><\/li>\n
  6. Byte and Character Methods<\/a><\/li>\n
  7. Matching Methods<\/a><\/li>\n
  8. Misc Methods<\/a><\/li>\n<\/ol>\n

     <\/p>\n

     <\/p>\n

    1. Indexing Methods<\/strong><\/h4>\n

    You you the indexing methods to find positions inside the string.<\/p>\n\n\n\n\n\n\n\n\n\n\n
    1<\/td>\nint indexOf(int ch)<\/strong><\/p>\n

    Returns the index within this string of the first occurrence of the given character.<\/td>\n<\/tr>\n

    2<\/td>\nint indexOf(int ch, int fromIndex)<\/strong><\/p>\n

    Returns the index within this string of the first occurrence of the given character, starting the search at the specified index.<\/td>\n<\/tr>\n

    3<\/td>\nint indexOf(String str)<\/strong><\/p>\n

    Returns the index within this string of the first occurrence of the given substring.<\/td>\n<\/tr>\n

    4<\/td>\nint indexOf(String str, int fromIndex)<\/strong><\/p>\n

    Returns the index within this string of the first occurrence of the given\u00a0 substring, starting at the specified index.<\/td>\n<\/tr>\n

    5<\/td>\nint lastIndexOf(int ch)<\/strong><\/p>\n

    Returns the index within this string of the last occurrence of the given\u00a0 character.<\/td>\n<\/tr>\n

    6<\/td>\nint lastIndexOf(int ch, int fromIndex)<\/strong><\/p>\n

    Returns the index within this string of the last occurrence of the given character, searching backward starting at the specified index.<\/td>\n<\/tr>\n

    7<\/td>\nint lastIndexOf(String str)<\/strong><\/p>\n

    Returns the index within this string of the rightmost occurrence of the given substring.<\/td>\n<\/tr>\n

    8.<\/td>\nint lastIndexOf(String str, int fromIndex)<\/strong><\/p>\n

    Returns the index within this string of the last occurrence of the given substring, searching backward starting at the specified index.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

     <\/p>\n

     <\/p>\n

    2. Comparison Methods<\/strong><\/h4>\n

    We use the comparison to compare a string to another string or object.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
    SN<\/th>\nMethod and brief description<\/th>\n<\/tr>\n
    2<\/td>\nint compareTo(Object o)<\/strong><\/p>\n

    Compares this String to the object given as parameter<\/td>\n<\/tr>\n

    3<\/td>\nint compareTo(String anotherString)<\/strong><\/p>\n

    Compares one string with another string lexicographically.<\/td>\n<\/tr>\n

    4<\/td>\nint compareToIgnoreCase(String str)<\/strong><\/p>\n

    Compares one string with another string lexicographically, and ignores case differences.<\/td>\n<\/tr>\n

    5<\/td>\nboolean equals(Object anObject)<\/strong><\/p>\n

    Compares a string to the specified object and returns true if they are equal. Otherwise returns false.<\/td>\n<\/tr>\n

    6<\/td>\nboolean equalsIgnoreCase(String anotherString)<\/strong><\/p>\n

    Compares a String with\u00a0 another String, ignoring case considerations. Returns true if the two strings are equal.<\/td>\n<\/tr>\n

    7<\/td>\nboolean contentEquals(StringBuffer sb)<\/strong><\/p>\n

    Returns true if and only if this String represents the same sequence of characters as the given StringBuffer. Returns false if otherwise<\/td>\n<\/tr>\n

    8<\/td>\nboolean startsWith(String prefix)<\/strong><\/p>\n

    Checks if this string starts with the given prefix. Returns true if yes, otherwise false.<\/td>\n<\/tr>\n

    9<\/td>\nboolean startsWith(String prefix, int toffset)<\/strong><\/p>\n

    Checks if a string starts with the given prefix beginning a specified index. It returns true is it does. Else, it returns false.<\/td>\n<\/tr>\n

    10<\/td>\nboolean endsWith(String suffix)<\/strong><\/p>\n

    Checks if this string ends with the given suffix.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

     <\/p>\n

     <\/p>\n

    3. Modifier Methods<\/strong><\/h4>\n

    You use these set of methods to modify the value of a string. However, keep in mind that the changes are not persisted. This is because, as you know, Strings are immutable.<\/p>\n\n\n\n\n\n\n\n\n
    1.<\/td>\nString replace(char c1, char c2)<\/strong><\/p>\n

    It returns a new string that results from replacing all occurrences of c1 in this string with c2<\/td>\n<\/tr>\n

    2<\/td>\nString replaceAll(String regex, String replacement)<\/strong><\/p>\n

    It replaces each substring of the string that matches the specified regular expression with the given replacement.<\/td>\n<\/tr>\n

    3<\/td>\nString replaceFirst(String regex, String replacement)<\/strong><\/p>\n

    It replaces the first substring of this string that matches the specified regular expression with the given replacement.<\/td>\n<\/tr>\n

    4<\/td>\nString[] split(String regex)<\/strong><\/p>\n

    Splits the string around matches of the specified regular expression. returns a string array<\/td>\n<\/tr>\n

    5.<\/td>\nString[] split(String regex, int limit)<\/strong><\/p>\n

    Splits a string around matches of the specified regular expression. Returns a string array.<\/td>\n<\/tr>\n

    6<\/td>\nString trim()<\/strong><\/p>\n

    It returns a copy of the string, with leading and trailing whitespace removed.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

     <\/p>\n

    4. Case Modifier Methods<\/strong><\/h4>\n

    Similar to the Modifier methods, the Case Modifier methods also modifies the value of a string. Unlike the modifiers however, case modifier specifically modifies the case of the string.<\/p>\n\n\n\n\n\n\n
    1<\/td>\nString toLowerCase()<\/strong><\/p>\n

    Converts all of the characters in a String to lower case applying the rules of the default locale.<\/td>\n<\/tr>\n

    2<\/td>\nString toLowerCase(Locale locale)<\/strong><\/p>\n

    Converts all of the characters in this String to lower case applying the rules of the specified Locale.<\/td>\n<\/tr>\n

    3<\/td>\nString toUpperCase()<\/strong><\/p>\n

    Converts all of the characters in this String to upper case applying the rules of the default locale.<\/td>\n<\/tr>\n

    4.<\/td>\nString toUpperCase(Locale locale)<\/strong><\/p>\n

    Converts all of the characters in this String to upper case applying the rules of the specified Locale.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

     <\/p>\n

     <\/p>\n

    5. Substring Methods<\/strong><\/h4>\n

    You use\u00a0 these methods to find either find substrings within given string<\/p>\n\n\n\n\n
    1<\/td>\nString substring(int beginIndex)<\/strong><\/p>\n

    It finds a substring from a string starting from the given index to the end of the string. Then returns this string<\/td>\n<\/tr>\n

    2<\/td>\nString substring(int beginIndex, int endIndex)<\/strong><\/p>\n

    It finds a substring from a string starting from the given index, beginIndex to the specified endIndex. Then returns this string<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n


    \n6. Bytes and Char Methods<\/strong><\/h4>\n

    These methods are use to retrieve char and byte related information.<\/p>\n\n\n\n\n\n\n\n
    1<\/td>\nbyte getBytes()<\/strong><\/p>\n

    It creates a sequence of bytes from a string by\u00a0 using the platform’s default charset, and stores the result into a new byte array. Then returns the new byte array.<\/td>\n<\/tr>\n

    2<\/td>\nbyte[] getBytes(String charsetName)<\/strong><\/p>\n

    It creates a sequence of bytes from a string using the named charset, storing the result into a new byte array. Then returns it.<\/td>\n<\/tr>\n

    3<\/td>\nvoid getChars(int srcBegin, int srcEnd, char[] dst, int dstBegin)<\/strong><\/p>\n

    Copies characters from this string into the destination character array.<\/td>\n<\/tr>\n

    4.<\/td>\nchar[] toCharArray()<\/strong><\/p>\n

    It converts the string to a character array.<\/td>\n<\/tr>\n

    5<\/td>\nchar charAt(int index)<\/strong><\/p>\n

    It returns the character at the given index.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

     <\/p>\n

     <\/p>\n

    7. Matching Methods<\/strong><\/h4>\n

    These methods are used to match the string against regular expressions or other texts.<\/p>\n\n\n\n\n\n
    1<\/td>\nboolean matches(String regex)<\/strong><\/p>\n

    Tells if\u00a0 a string matches the given regular expression. Returns true if it matches.Otherwise, returns false.<\/td>\n<\/tr>\n

    2<\/td>\nboolean regionMatches(ignoreCase, toffset, String other, int ooffset, int len)<\/strong><\/p>\n

    Checks whether two string regions are equal.\u00a0 Watch the video for the demo<\/td>\n<\/tr>\n

    3<\/td>\nboolean regionMatches(int toffset, String other, int ooffset, int len)<\/strong><\/p>\n

    Tests whether two string regions are equal. Watch the video for the demo<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

     <\/p>\n

     <\/p>\n

    8. Misc Methods<\/strong><\/h4>\n

    We also have other methods that does not fall into any of the categories. Hence they are miscellaneous methods. Find list of them below.<\/p>\n\n\n\n\n\n\n\n\n\n\n
    1<\/td>\nstatic String valueOf(primitive data type x)<\/strong><\/p>\n

    This method returns the string representation of the specified data type argument.<\/td>\n<\/tr>\n

    2<\/td>\nint hashCode()<\/strong><\/p>\n

    Returns a hash code for the string as integer<\/td>\n<\/tr>\n

    3.<\/td>\nString intern()<\/strong><\/p>\n

    Returns a canonical representation for the string a particular string.<\/td>\n<\/tr>\n

    4<\/td>\nint length()<\/strong><\/p>\n

    Returns the length of this string. That is number of characters in the string<\/td>\n<\/tr>\n

    7<\/td>\nString toString()<\/strong><\/p>\n

    Converts a string to a string. So basically returns the same string!<\/td>\n<\/tr>\n

    7<\/td>\nstatic String copyValueOf(char[] data)<\/strong><\/p>\n

    It returns a String that represents the character sequence in the given character array.<\/td>\n<\/tr>\n

    8<\/td>\nstatic String copyValueOf(char[] data, int offset, int count)<\/strong><\/p>\n

    It returns a String that represents the character sequence in the given character array starting from offset to the speficied count.<\/td>\n<\/tr>\n

    5<\/td>\nString concat(String str)<\/strong><\/p>\n

    Concatenates the specified string to the end of a string. Combines the two strings together<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

     <\/p>\n","protected":false},"excerpt":{"rendered":"

    In this lesson, we are going to learn about various String methods. If you would need to manipulate strings, then these methods are handy.   … <\/p>\n","protected":false},"author":395,"featured_media":140,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[2],"tags":[],"class_list":["post-111","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java-tutorial"],"yoast_head":"\nJava - String Methods - Java Tutorials<\/title>\n<meta name=\"description\" content=\"In this tutorial you will learn how to manipulate strings in Java using various string methods available in the String class.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.kindsonthegenius.com\/java\/23-java-string-methods\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java - 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