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Unit-2 Objects and Classes

Unit-2 Objects and Classes. String Class. 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.

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Unit-2 Objects and Classes

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  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.

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