1. Unit-2 Objects and Classes
String Class

2. String Class A string is a sequence of characters.
In many languages, strings are treated as an array of characters,
but in Java a string is an object.
The String class has 11 constructors and more than 40 methods for manipulating strings.

3. Constructing a String

4. Immutable Strings and Interned Strings

5. String Comparisons

6. String Comparisons(Cont.)
Using equals Function:

7. String Comparisons(Cont.)
Using compare To Function:

8. Program(Equal to & Compare TO)

9. Program(regionMatches() )

10. Program (endWith)

11. Program (startWith)

12. String Length, Characters, and Combining Strings
The String class provides the methods for obtaining length, retrieving individual characters, and concatenating strings.

13. Program

14. Obtaining Substrings
You can also obtain a substring from a string using the substring method in the String class.

15. Example

16. Converting, Replacing, and Splitting Strings
The String class provides the methods for converting, replacing, and splitting strings, as shown in Figure.

17. Program

18. Example(Split () )

19. String Matching

20. Finding a Character or a Substring in a String
The String class provides several overloaded indexOf and lastIndexOf methods to find a character or a substring in a string.

21. Program

22. Conversion between Strings and Arrays

23. Formatting Strings

24. Converting Characters and Numeric Values to Strings
There are several overloaded versions of the valueOf method that can be used to convert a character and numeric values to strings with different parameter types, char, double, long, int, and float.