Design Mode-Decoration Design Mode

Decoration Design Mode: When you need to enhance some class functions, you can upload the objects of this class to the custom class, then, use the methods provided by this object to enhance functions on this basis.

Difference from inheritance: Higher scalability

Code example:

Import Java. io. *; Class mybufferedreader {private filereader; Public mybufferedreader (filereader) {This. filereader = filereader;} Public String myreadline () throws ioexception {stringbuilder sb = new stringbuilder (); int readnum = 0; while (readnum = filereader. read ())! =-1) {char readchar = (char) readnum; If (readchar = '\ n' | readchar =' \ R') return sb. tostring (); else sb. append (readchar) ;}return null ;}}

 

Design Mode-Decoration Design Mode