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Use of Replace

                                                                                  Replace
                                                                     
1.    replace(): This method is used to replace all the occurrences of a single character with some another character, within the string.
The general form is.
String replace(char ch1,char ch2)
Where:
                                    ch1 is used to specify the character which we want to replace .
                                    ch2 is used to specify the character  by which we want to replace the ch1
      E.g.
                String s="hello";
                       String s2;
                            s2=s.replace('l','t');
                                   System.out.println(s2);
    Output:
                    hetto

2.    toString(): This method is call when we convert any value to type String . If we want to
System.out.println(ob);

Where                          ob is an object of the Sample class, it will generate an error, as we have not defined the toString() method for the class Sample

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