JAVA Implementation Interface Class

Requirement: Define an interface with four abstract methods.

Interface functions:

<Br/> Public interface jiekou {<br/> Public double area (); <br/> Public double Len (); <br/> Public void area1 (); <br/> Public void len1 (); <br/>}< br/>

Circle class, implementation interface:

Public class circle implements jiekou {<br/> double r; <br/> double ESP = 3.1415926; <br/> circle (double) <br/>{< br/> r = A; <br/>}< br/> Public double area () {<br/> // todo auto-generated method stub <br/> return ESP * r; <br/>}< br/> Public void area1 () {<br/> // todo auto-generated method stub <br/> system. out. println ("Circle area () = 3.1415926 * r"); <br/>}< br/> Public double Len () {<br/> // todo auto-generated method stub <br/> return 2 * ESP * r; <br/>}< br/> Public void len1 () {<br/> // todo auto-generated method stub <br/> system. out. println ("circle Len () = 2*3.1415926 * r"); <br/>}< br/>

Rectangle class, implementation interface:

Public class rectangle implements jiekou {<br/> double H, W; <br/> rectangle (double A, double B) <br/>{< br/> H =; W = B; <br/>}< br/> Public double area () {<br/> // todo auto-generated method stub <br/> return H * W; <br/>}< br/> Public void area1 () {<br/> // todo auto-generated method stub <br/> system. out. println ("H * w"); <br/>}< br/> Public double Len () {<br/> // todo auto-generated method stub <br/> return 2 * H + 2 * w; <br/>}< br/> Public void len1 () {<br/> // todo auto-generated method stub <br/> system. out. println ("2 * H + 2 * w"); <br/>}</P> <p >}< br/>

Main function:

Public class main {<br/>/** <br/> * @ Param ARGs <br/> */<br/> Public static void main (string [] ARGs) {<br/> // todo auto-generated method stub <br/> jiekou A = new circle (10); </P> <p> system. out. println (. area (); <br/>. area1 (); <br/> jiekou B = new rectangle (10, 20); <br/> system. out. println (INT) B. area (); <br/> B. area1 (); <br/>}< br/>