Eighth job - inherited

topic:

Writing an application, create a rectangle class, a class with a long, wide two member variables and methods find the circumference. Then create a subclass of the class of rectangular - square classes, methods defined in the class seeking area, find the circumference rewriting method. In the main class, the input side length of a square, a square object is created, the square area and perimeter requirements. (Note: all classes are in a package)

 

Code:

TestA.java：

factorial Package Penalty for;
 / * * 
 * 
 * @ClassName: TestA   
 * @author Dandelion 
 * @date: 2019 Nian 9 24 afternoon 7:15:32 
 * TODO: Create a parent and child classes, parent class is rectangular, subclass square, subclass inherits 
 * TODO: find the circumference methods. 
 * / 
Public  class TestA {
     public  int length;
     public  int width;
     public  int Perimeter;
     public  int the getPerimeter () { 
        Perimeter = (length + width) * 2 ;
         return Perimeter; 
    } 
} 

class TestB, the extends TestA {
     public int getArea() {
        return length * length;
    }
    public int getPerimeter() {
        return length * 4;
    }
    
}

 

Testc.java：

factorial Package Penalty for; 
Import Classes in java.util. * ;
 / * * 
 * 
 * @ClassName: TESTC   
 * @author Dandelion 
 * @date: 2019 Nian 9 24 afternoon 7:18:27 
 * TODO test perimeter and area 
 * / 
public  class {TestC 

    public  static  void main (String [] args) { 
        the System. OUT .println ( " Please enter the length and width of the rectangle: " ); 
        Scanner iNPUT = new new Scanner (. the System in ); 
        TestA Testa = new new TestA (); 
        testa.length =input.nextInt (); 
        testa.width = input.nextInt ();
         int Perimeter = testa.getPerimeter (); 
        the System. OUT .println ( " circumference: " + Perimeter); 
        
        . the System OUT .println ( " Enter square length: " ); 
        TestB, TestB = new new TestB, (); 
        testb.length = input.nextInt ();
         int Area = testb.getArea ();
         int squarePerimeter = testb.getPerimeter (); 
        the System. OUT.println ( " square perimeter and area: " + Area + " \ T " + squarePerimeter); 

    } 

}

operation result: