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Mastering Java String Class Methods

Learn about Java String class, its constructors and methods for manipulating strings. Understand constructing immutable and interned strings, comparisons using methods like equals and compareTo, string length & operations. Examples on substrings, conversions, replacements, and splitting strings. Explore character matching, conversion between strings & arrays, and formatting strings.

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Mastering Java String Class Methods

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Presentation Transcript

  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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