Java callback function

callback function

My understanding of the callback function

Assume:

My car is at home, now it's broken, I call the almighty mechanic, I told him, hey! Brother, help me fix my car! However, the maintenance workers told me that there is no free time, and so I can come home service! I told the repairman that if you were free, you would come straight to my house and fix it for me.

In the case of a program:

If I want a class that calls my own method of declaring, then I need a callback interface to get my own class to implement it. By doing so, the callback function is implemented. The callback function is like a delegate in C #. There is no similar mechanism in Java. The interface can be used to implement callbacks.

Here is a small demo:

The following is a simple class that contains a callback method that I want to implement, which implements the callback interface for iworkable.

1  Public classCaller implements iworkable{2     /*3 * This is the way I want to be recalled *4      * */5 @Override6      Public voidWork () {7         8System. out. println ("I am the call class method, I succeeded to make calls, I succeeded to let the worker invoke!");9     }Ten  One}

Here is the callback interface:

1  Public Interface iworkable {2     // It 's simply a simple way of defining 3     void Work (); 4 }

Here is the class for the callback operation:

1  Public classWorker {2     3     //The callback interface object, which is assigned to the variable by caller by the Richter conversion law, is passed through this variable to complete the callback operation4 iworkable workable;5     6     /*7 * Assign a value to the corresponding callback function8      * */9      Public  voidsetworkable (iworkable IWA) {Ten          This. workable=IWA; One     } A      -      Public voidWork () { - workable.work (); the     } -}

Summarize:

　　The implementation of the callback function actually uses a simple dynamic proxy pattern that executes when it wants to execute.

Java callback function