java ninth job - Interface and Interface recall

Title: using the interface and the interface to the callback, simple factory mode, when inputting different characters indicate corresponding pattern obtained by using the graphical object factory class, then the figure is calculated in the column bottom volume.

A source code

1、Shape.java

Package cn.edu.ccut.jia; 

public  interface the Shape {       // define the shape of the interface 
abstract  Double the getArea (); 
}

2、Rectangle.java

Package cn.edu.ccut.jia;
 // define a rectangle class, creating a long, wide two member variables defined mensuration method 
public  class the Rectangle the implements the Shape {
      Double length;
      Double width;
     public the Rectangle ( Double length, Double width) {
         the this .length = length;
         the this .width = width; 
    } 
public  Double the getArea () { 
    
    return      length * width; 
    } 
}

3, Zheng.java

Package cn.edu.ccut.jia;
 // define a class square, rectangular and inherited class 
public  class Zheng the extends the Rectangle { 
    Zheng ( Double Side) {
         Super (Side, Side); // Super call the parent class method 
    }
     public  Double the getArea () { // area method override 
        
    return     length * length; 
    } 

}

4, Yuan.java

Package cn.edu.ccut.jia;
 // define a circle class, create a member variable r, defined mensuration method 
public  class Yuan the implements the Shape {
     Double R & lt;
    Double the PI = 3.14 ;
     public Yuan ( Double R & lt) {
         the this .r = R & lt; 
    } 
    public  Double the getArea () { 
        
        return      R & lt * R & lt * the PI; 
        } 
}

5, Tringle.java

Package cn.edu.ccut.jia;
 // define a triangle class, create three member variables w, x, y, defined mensuration method 
public  class Tringle   the implements the Shape {
      Double W;
      Double X;
      Double Y;
     public Tringle ( Double W, Double X, Double Y) {
         the this .W = W;
         the this .x = X;
         the this .y = Y; 
} 
public  Double the getArea () {
     Double Q = (W + X + Y) / 2 ; 

    return   the Math. sqrt (q * (qw) * (qx) * (q-Y)); 
} 
}

6, Tixing.java

Package cn.edu.ccut.jia;
 // define a trapezoidal class, create three member variables a, b, h, define mensuration method 
public  class Tixing the implements the Shape {
      Double A;
      Double B;
      Double H;
     public Tixing ( Double A, Double B, Double H) {
         the this II.A = A;
         the this .B = B;
         the this .h = H; 
    } 
    public  Double the getArea () {
         return (A + B) * H / 2 ; 
    } 
}

7、Cone.java

Package cn.edu.ccut.jia;
 // define a cartridge class, and create a high interface object member variable, to calculate the volume defined method 
public  class Cone {
     Double   high; 
    the Shape Shape; 
    public Cone (the Shape Shape, Double high) {
         the this .shape = Shape;
         the this .high = High; 
    } 
      Double getv () {
         return   High * shape.getArea (); 
     } 
        
}

8、Foctory.java

Package cn.edu.ccut.jia;
 // create a factory class 
Import Classes in java.util *. ;
 public  class Foctory { 
    Scanner Reader = new new Scanner (the System.in); 
    the Shape getShape ( char D) { 
        the Shape Shape = null ;
         Switch ( D) {
         Case 'R & lt' : 
            System.out.println ( "enter a high squareness length, width and pillar" ); 
            Shape = new new the rectangle (reader.nextDouble (), reader.nextDouble ());
         BREAK ;
         Case 'Z' :
            System.out.println ( "Please enter the side of the square pillar and high" ); 
            Shape = new new Zheng (reader.nextDouble ());
         BREAK ;
         Case 'Y' : 
            System.out.println ( "Please enter the circle and high cylinder radius " ); 
            Shape = new new Yuan (reader.nextDouble ());
         BREAK ;
         Case 'S' : 
            System.out.println ( " enter a high and long sides of the triangle pillar " ); 
            Shape = new new Tringle (reader.nextDouble (), reader.nextDouble (), reader.nextDouble ());
         BREAK ;
        Case 'T' : 
            System.out.println ( "Please enter the trapezoid on the bottom, a lower base, and the post high high" ); 
            Shape = new new Tixing (reader.nextDouble (), reader.nextDouble (), reader.nextDouble ( ));
         BREAK ; 
        } 
        return Shape; 
     } 
}

9、Test.java

Package cn.edu.ccut.jia;
 Import cn.edu.ccut.jia *. ;
 Import Classes in java.util *. ;
 public  class the Test {
     public  static  void main (String [] args) {
         the while ( to true ) { 
            Scanner Reader = new new Scanner (the System.in); 
        System.out.println ( "Please enter your choice shape: rectangular r, square z, triangular s, round y, trapezoidal T" );
         char D = reader.next () the charAt. (0 ); 
        Foctory F = new new Foctory (); 
        Cone C = new new Cone(f.getShape(d),reader.nextDouble());
        System.out.println(c.getV());
        
    }

}
}

Second, run shot