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16.3.6 The toUpperCase() Method
              The toUpperCase() method  converts the String  to capital letters. It returns a String  value.  The syntax to use the
              toUpperCase() method is:
                  String <variable> = <String_Object>.toUpperCase();
              For example:
                  String str= "KOLkatA – 700114";
                  String changestr= str.toUpperCase();
                  System.out.println("The converted string is: " +changestr);
              You will get the following output:

              The converted string is: KOLKATA – 700114

                     Note: If the string contains any capital letters or digits or special characters, then there will be no
                     change.


              16.3.7 The concat() Method
              The concat() method combines two strings together. The String object through which the concat() method is called
              and the String passed in the parameter are the two strings that are combined. The process of combining two strings is
              known as concatenation. The concate() method returns a String value after concatenating both the strings. The syntax
              to use the concat() method is:
                  String <variable> = <String_Object>.concat(String str);
              For example:
                  String str1= "Kolkata-";
                  String str2="700114";
                  String joinstr= str1.concat(str2);
                  System.out.println("The joined string is: " +joinstr);
              You will get the following output:
              The joined string is: Kolkata–700114

              We can also use the “+” operator to concatenate two strings. For example:
                  String str1= "Kolkata-";
                  String str2="700114";
                  String joinstr= str1 + str2;
                  System.out.println("The joined string is: " +joinstr);
              You will get the following output:

              The joined string is: Kolkata–700114

              16.3.8 The substring() Method
              A substring is a part of a string. The substring() method is used for extracting all the characters from the index position
              till the end of the string. It returns a String value. The syntax to use the substring() method is:
                  String <variable> = <String_Object>.substring(int index);
              For example:

                  String str= "Kolkata-700114";
                  String extractstr= str.substring(8);
                  System.out.println("The extracted string is: " +extractstr);
              You will get the following output:
              The extracted string is: 700114
              The substring() method also has an overloaded method which takes starting index from where the substring started
              and the ending index upto which the substring should be taken as parameters. The substring(beginIndex, endIndex)



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