- This pattern is used when it must be decided at run time which one of several compatible classes is to be instantiated.
- For example, the abstract Collator class's getInstance() method returns a collation object that is appropriate for the default locale, as determined by java.util.Locale.getDefault():
- Like other locale-sensitive classes, you can use the static factory method, getInstance, to obtain the appropriate Collator object for a given locale.
- The following example shows how to compare two strings using the Collator for the default locale.
- Compare two strings in the default locale
- Collator myCollator = Collator.getInstance();
- if( myCollator.compare("abc", "ABC") < 0 )
- System.out.println("abc is less than ABC");
- else
- System.out.println("abc is greater than or equal to ABC");
Primitive Obsession is the name of a code smell that occurs when we use primitive data types to represent domain ideas. For example, we use a string to represent a message or an integer to represent an amount of money. For Example: Code with Primitive Obsession // primitiveObsession.java public class primitiveObsession { public static void main ( String args []) { Integer [] cityPopulations = { 13000000 , // London 21903623 , // New York 12570000 , // Tokyo 1932763 , // Stockholm 1605602 , // Barcelona 4119190 // Sydney }; for ( Integer cityPopulation : cityPopulations ) { System . out . println ( cityPopulation ); } } } public class City { private final String name ; private final int population ; private final Continent continent ; public String getName () { return name ; } public int getPopulation () { return population ; } public Continent ge...