Unit-2 Objects and Classes

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Presentation transcript:

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.

Constructing a String

Immutable Strings and Interned Strings

String Comparisons

String Comparisons(Cont.) Using equals Function:

String Comparisons(Cont.) Using compare To Function:

Program(Equal to & Compare TO)

Program(regionMatches() )

Program (endWith)

Program (startWith)

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

Program

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

Example

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

Program

Example(Split () )

String Matching

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.

Program

Conversion between Strings and Arrays

Formatting Strings

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.