Page 247 - Computer science 868 Class 12
P. 247

16              douvar = do1;
                  17              //Printing

                  18              System.out.println("The value of intvar : " + intvar);
                  19              System.out.println("The value of douvar: " + douvar);

                  20          }
                  21      }

                 The output of the preceding program is as follows:
                 The value of in : 768
                 The value of do: 23.45
                 The value of intvar : 768
                 The value of douvar: 23.45

                 8.10.2 Methods of String Class
                 These methods work on a group of letters enclosed within double quotations(“ ”). There are many in-built String
                 methods that are defined in the String class. These methods are used to perform different types of operations on the
                 String object.
                   1.  int length(): This method is used to return the number of characters present in the string. It returns an integer type
                    of value. Length() is the only function where the counting starts from 1.

                        String st = "We study in class 12";
                        int len = st.length();
                        System.out.println("The length is :" +len);
                   Output:

                    The length is: 20                               // All characters within " " including space
                   2. char charAt(int index): This method returns the character at the given index. It returns “char” type data.
                        String st = "We study in class 12";
                        char ch = st.charAt(4);
                        System.out.println("The character is :" +ch);
                   Output:
                    The character is: t
                   3.  int indexOf(char ch): This method returns the index value of the first existence of the character ch present in the
                    String object. It returns an integer type of value.
                        String st = "We study in class 12";
                        int v = st.indexOf('t');
                        System.out.println("The index value is :" +v);
                   Output:
                    The index value is:  4
                   4.  int indexOf(char ch, int index): This method returns the index value character ch present in the string of the
                    current String object starting from the index provided in the parameter. It returns an integer type of value.
                        String st = "We study in class 12";
                        int v = st.indexOf('s',16);
                        System.out.println("The index value is :" +v);
                   Output:
                    The index value is: 16




                                                                                                                       245
                                                                                                            Methods    245
   242   243   244   245   246   247   248   249   250   251   252