Convert the given string into an array of characters for each character of the array verify whether it is upper case, lower case, digit or, any other character using isUpperCase(), isLowerCase(), isDigit() method of the Character class.ExampleLive Demopublic class Sample2 {    public static void main(String args[]) {       String data = "Hello HOW are you MR 51";       char [] charArray = data.toCharArray();       int upper = 0;       int lower = 0;       int digit = 0;       int others = 0;       int totalChars = data.length();       for(int i=0; i

Following are the various constructors provided by the StringBuilder class.S.N.Constructor & Description1StringBuilder()This constructs a string builder with no characters in it and an initial capacity of 16 characters.2StringBuilder(CharSequence seq)This constructs a string builder that contains the same characters as the specified CharSequence.3StringBuilder(int capacity)This constructs a string builder with no characters in it and an initial capacity specified by the capacity argument.4StringBuilder(String str)This constructs a string builder initialized to the contents of the specified string.

The isEmpty() method of the String class returns true if the length of the current string is 0.Example Live Demoimport java.lang.*; public class StringDemo {    public static void main(String[] args) {       String str = "tutorialspoint";       //prints length of string       System.out.println("length of string = " + str.length());             //checks if the string is empty or not       System.out.println("is this string empty? = " + str.isEmpty());    } }Outputlength of string = 14 is this string empty? = false

The StringBuilder class of the java.lang package is a mutable sequence of characters. This provides an API compatible with StringBuffer, but with no guarantee of synchronization. Following are the list of constructors provided by the StringBuilder class.S.N.Constructor & Description1StringBuilder()This constructs a string builder with no characters in it and an initial capacity of 16 characters.2StringBuilder(CharSequence seq)This constructs a string builder that contains the same characters as the specified CharSequence.3StringBuilder(int capacity)This constructs a string builder with no characters in it and an initial capacity specified by the capacity argument.4StringBuilder(String str)This constructs a string builder initialized to the contents of the specified string. ... Read More

The intern() method of the String class returns a canonical representation for the string object. It follows that for any two strings s and t, s.intern() == t.intern() is true if and only if s.equals(t) is true.ExampleLive Demoimport java.io.*; public class Test {    public static void main(String args[]) {       String Str1 = new String("Welcome to Tutorialspoint.com");       String Str2 = new String("WELCOME TO SUTORIALSPOINT.COM");       System.out.print("Canonical representation:" );       System.out.println(Str1.intern());       System.out.print("Canonical representation:" );       System.out.println(Str2.intern());    } }OutputCanonical representation: Welcome to Tutorialspoint.com Canonical representation: WELCOME TO ... Read More

You can convert a String value to an integer either using the valueOf() method of the String class or using the toString() method of the Integer class.

The intern() method of the String method returns a canonical representation for the string object. A pool of strings, initially empty, is maintained privately by the class String.For any two strings s and t, s.intern() == t.intern() is true if and only if s.equals(t) is true.All literal strings and string-valued constant expressions are interned.Example Live Demoimport java.lang.*; public class StringDemo {    public static void main(String[] args) {       String str1 = "This is TutorialsPoint";       // returns canonical representation for the string object       String str2 = str1.intern();             // prints ... Read More

Following are the various constructors provided by the StringBuffer class.S.N.Constructor & Description1StringBuffer()This constructs a string buffer with no characters in it and an initial capacity of 16 characters.2StringBuffer(CharSequence seq)This constructs a string buffer that contains the same characters as the specified CharSequence.3StringBuffer(int capacity)This constructs a string buffer with no characters in it and the specified initial capacity.4StringBuffer(String str)This constructs a string buffer initialized to the contents of the specified string.

The StringBuffer and StringBuilder classes are used when there is a necessity to make a lot of modifications to Strings of characters.Unlike Strings, objects of type StringBuffer and String builder can be modified over and over again without leaving behind a lot of new unused objects.The StringBuilder class was introduced as of Java 5 and the main difference between the StringBuffer and StringBuilder is that StringBuilder’s methods do not thread safe (not synchronized).It is recommended to use StringBuilder whenever possible because it is faster than StringBuffer. However, if the thread safety is necessary, the best option is StringBuffer objects. Read More

To perform a reverse toggle split the words of a string, reverse each word using the split() method, change the first letter of each word to lower case and remaining letters to upper case.Example Live Demoimport java.lang.StringBuffer; public class ToggleReverse {    public static void main(String args[]){       String sample = "Hello How are you";       String[] words = sample.split(" ");       String result = "";       for(String word:words){          StringBuffer s = new StringBuffer(word);          word = s.reverse().toString();          String firstSub = word.substring(0, 1);          String secondSub = word.substring(1);          result = result+firstSub.toLowerCase()+secondSub.toUpperCase()+" ";       }       System.out.println(result);    } }OutputoLLEH wOH eRA uOY