String handling functions using Java
A string is a collection of characters. In Java, a string is an object that represents a collection of objects. A string is a predefined class used to create string objects. It is an immutable object, which means it can’t be updated once created.
The string class has a set of built-in-methods, defined below.
charAt(): It returns a character at a specified position.equals(): It compares the two given strings and returns aBoolean, that is,TrueorFalse.concat(): Appends one string to the end of another.length(): Returns the length of a specified string.toLowerCase(): Converts the string to lowercase letters.toUpperCase(): Converts the string to uppercase letters.indexOf(): Returns the first found position of a character.substring(): Extracts the substring based on index values, passed as an argument.
Code
class Main{public static void main(String []args){String s1="Adithya";String s2="Adithya";String s3="Adi";boolean x=s1.equals(s2);System.out.println("Compare s1 and s2:"+x);System.out.println("Character at given position is:"+s1.charAt(5));System.out.println(s1.concat(" the author"));System.out.println(s1.length());System.out.println(s1.toLowerCase());System.out.println(s1.toUpperCase());System.out.println(s1.indexOf('a'));System.out.println(s1.substring(0,4));System.out.println(s1.substring(4));}}
Code explanation
-
Lines 4-6: We create three strings
s1,s2, ands3. -
Line 7: We compare two strings
s1ands2usingequals()function. -
Line 9: We find the character at position 5 in string
s1usingcharAt()function and print it. -
Line 10: We concatenate two strings using the
concat()function. -
Line 11: We find the length of string
s1usinglength()function. -
Line 12: We convert the string
s1to lowercase letters usingtoLowerCase()function. -
Line 13: We convert the string
s1to uppercase letters usingtoUpperCase()function. -
Line 14: We find the index of
ain strings1usingindexOf()function. -
Lines 15-16: We find the substring by passing indexes as parameters to the
substring()function.
