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

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.

To find whether a given string contains a number, convert it to a character array and find whether each character in the array is a digit using the isDigit() method of the Character class.ExampleLive Demopublic class ContainsExample {    public static void main(String args[]){       String sample = "krishna64";       char[] chars = sample.toCharArray();       StringBuilder sb = new StringBuilder();       for(char c : chars){          if(Character.isDigit(c)){             sb.append(c);          }       }       System.out.println(sb);    } }Output64

You can change the cases of the letters of a word using toUpperCase() and toLowerCase() methods.Split each word in the string using the split() method, change the first letter of each word to lower case and remaining letters to upper case.ExampleLive Demopublic class Sample{    public static void main(String args[]){       String sample = "Hello How are you";       String[] words = sample.split(" ");       String result = "";       for(String word:words){          String firstSub = word.substring(0, 1);          String secondSub = word.substring(1);          result = result+firstSub.toLowerCase()+secondSub.toUpperCase()+" ";       }       System.out.println(result);    } }OutputhELLO hOW aRE yOU

The java.lang.String.contains() method returns true if and only if this string contains the specified sequence of char values.ExampleLive Demopublic class Sample {    public static void main(String args[]){       String str = "Hello how are you welcome to tutorialspoint";       String test = "tutorialspoint";       Boolean bool = str.contains(test);       System.out.println(bool);    } }Outputtrue

StringBuffer class of the java.lang package provides reverse() method. This method returns a reverse sequence of the characters in the current String. Using this method you can reverse a string in Java.To reverse each word in a string you need to split the string, store it in an array of strings and reverse each word using the reverse() method of the StringBuffer class.ExampleLive Demoimport java.lang.*; public class StringBufferDemo {    public static void main(String[] args) {       StringBuffer buff = new StringBuffer("tutorials point");       System.out.println("buffer = " + buff);       // reverse characters of the ... Read More