Page 239 - computer science (868) class 11
P. 239
The indexOf(char ch, int index) Function
For a string variable, this function returns the index value of the given character present in the string of the current
String object starting from the index provided in the parameter. It returns an integer type value. The syntax is:
int <variable> = String_datatype_Variable.indexOf(char ch, int index);
Let us see the below example:
String str= "Computer Science";
int position= str.indexOf('c',11);
System.out.println("The index value is: " + position);
Output:
The index value is: 14
The lastIndexOf(char ch) Function
For a string variable, this function returns the index value of the last existence of the given character present in the
string of the current String object. It returns an integer type value. The syntax is:
int <variable> = String_datatype_Variable.lastIndexOf(char ch);
Let us see the below example:
String str= "Computer Science";
int position= str.lastIndexOf('e');
System.out.println("The index value is: " +position);
Output:
The index value is: 15
The toLowerCase() Function
As the name itself suggests, this function converts the given string to the corresponding string in lowercase letters.
However, for any letters written in lowercase, there will be no change in the output. The syntax is:
String <variable> = String_datatype_Variable.toLowerCase();
Let us see the below example:
String str= "KOLkatA - 700114";
String changestr= str.toLowerCase();
System.out.println("The converted string is: " +changestr);
Output:
The converted string is: kolkata - 700114
The toUpperCase() Function
This method converts the given string to the corresponding string in upper case letters. However, for the letters already
in upper case, there will be no change in the output. The syntax is:
String <variable> = String_datatype_Variable.toUpperCase();
Let us see the below example:
String str= "KOLkatA - 700114";
String changestr= str.toUpperCase();
System.out.println("The converted string is: " +changestr);
Output:
The converted string is: KOLKATA – 700114
237
Strings 237

