Java Learning notes-callback functions

Reprint: http://wangyang0311.iteye.com/blog/368031

In general, it is divided into the following steps:

1. The unified interface for declaring a callback function is interface A, which contains the method callback ();
2. The interface is set to private members within the calling class caller.
3. The public method for implementing the A interface is provided within the caller (the implementation class of the external interface is passed through the formal parameter to the caller XXX);
4. The Xxx.callback () method is used in a caller method Dosth ();
5. In the example of caller, a interface is implemented first, then the Dosth () method is called.

Popular Online Code:

//callback function interface and method Public InterfaceIcallback { Public voidfunc (); }//callback function interface implementation class Public classClasswithcallbackfunctionImplementsicallback{ Publicclasswithcallbackfunction () {} Public voidfunc () {System.out.println ("CCCCCCCCCCCCCCCCCC"); }}     Public classCaller {PrivateIcallback callback;//Private Interface Members   Public voidSetcallback (Icallback callback) { This. callback = callback;//implementation of interface members: incoming from outside  }    Public voidDoCallback () {//methods for callback interface membersCallback.func (); } }} Public classMainClass { PublicMainClass () {} Public Static voidMain (string[] args) {Caller Caller=NewCaller (); Caller.setcallback (Newclasswithcallbackfunction () { Public voidfunc () {System.out.println ("Aaaaaaaaaa");    }    });      Caller.docallback (); //Implementing Callbacks  }}  //In Reality, the DoCallback () method is placed in the Setcallback call, the above is to illustrate the callback principle Public classCaller {Icallback callback;  Public voidDoCallback () {callback.func (); }   Public voidSetcallback (Icallback callback) { This. Callback =callback;  DoCallback (); }}

Java Sort Interface

InterfaceCompare {BooleanLessThan (Object LHS, object RHS); Booleanlessthanorequal (Object LHS, object RHS); }ImportJava.util.*;  Public classSortvectorextendsVector {PrivateCompare Compare;//Private Interface Members 　　　  PublicSortvector (Compare comp) {Compare=comp; } Public voidsort () {QuickSort (0, size ()-1); }Private voidQuickSort (intLeftintRight ) {if(Right >Left ) {Object O1=ElementAt (right); inti = left-1; intj =Right ;  while(true) { while(Compare.lessthan (ElementAt (++i), O1));  while(J > 0)if(Compare.lessthanorequal (ElementAt (--j), O1)) Break; if(I >= J) Break;　　　    Swap (I, j);　　　   } swap (I, right); QuickSort (left, I-1); QuickSort (i+1, right); }}Private voidSwapintLoc1,intloc2) {Object tmp=ElementAt (LOC1);　　     Setelementat (ElementAt (LOC2), Loc1);　　　Setelementat (TMP, LOC2); }}

Java Learning notes-callback functions