Java design mode-proxy mode-static proxy

Proxy mode:
Using an environment that cannot directly use object A (a delegate object), you can use object B (the proxy object) to call object A that has reached the effect of calling object a directly, and becomes the proxy mode.

Where a is the delegate object and B is the proxy object.

Advantages and disadvantages of static proxies:

Advantages :

1, the code, you can clearly understand the entrusted Thunder and proxy class.

2, in the compilation period to join, in advance to appoint a good delegate class, proxy class, high efficiency.

Disadvantages :

1, static agent is troublesome, need a lot of proxy class, not easy code maintenance, etc.

When we have more than one target object need to proxy, I need to set up a number of proxy classes, change the original code, changed more is likely to be a problem, it must be re-tested.

2, duplicate code will appear in every corner, the code is too redundant .

3, in the compilation period, the system flexibility is poor, not easy to modify the flexibility

The pseudo code is as follows:

/** Delegate class */

Class a{

public void Method1 () {

System.out.println ("from A method");

};

}

/** proxy class */

Class b{

A;

Public B (a a) {

THIS.A = A;

}

void Method1 () {

if (null! = a) {

A.method1 ();

}

};

}

/**********/

Call procedure

Main () {

b b = new B (new A ());

B.method1 ();

}

/**************************************************** If have mistake, forget elegance, thanks! *************************************************************/

Java design mode-proxy mode-static proxy