In Java Create a testing class that does the following to the given codes below:
To demonstrate polymorphism do the following:
Create an arraylist to hold 4 base class objects
Populate the arraylist with one object of each data type
Code a loop that will process each element of the arraylist
Call the first ‘common functionality’ method
Call the second ‘common functionality’ method
Call the third ‘common functionality’ method
Verify that each of these method calls produces unique results
Call the ‘getWidth’ method – does it work?
Create a derived class object and call the base class ‘get’ method-how does it work?
Given Codes:
public class Shape {
protected int length;
/**
* @param length
*/
Shape(int length) {
this.setLength(length);
}
/**
* @return the length
*/
public int getLength() {
return length;
}
/**
* @param length the length to set
*/
public void setLength(int length) {
this.length = length;
}
/**
* draws the shape
*/
public void draw() {
System.out.println("Can't draw - no specifics");
}
/**
* calculates the area
*/
public void area() {
System.out.println("Can't calc area - no specifics");
}
/* (non-Javadoc)
* @see java.lang.Object#toString()
*/
public String toString() {
return "Length is " + length;
}
public class Line extends Shape {
Line (int length) {
super(length);
}
/**
* draws the line shape
*/
public void draw() {
System.out.println("****");
}
/* (non-Javadoc)
* @see Shape#toString()
*/
public String toString() {
return super.toString() + "(Line)";
}
/**
* calculates the area
*/
public void area() {
System.out.println("The area of a line is " + 1);
}
}
public class Rectangles extends Shape {
private int width;
Rectangles (int length, int width) {
super(length);
this.setWidth(width);
}
/**
* @return the width
*/
public int getWidth() {
return width;
}
/**
* @param width the width to set
*/
public void setWidth(int width) {
this.width = width;
}
/**
* draws the line shape
*/
public void draw() {
System.out.println("*******");
System.out.println("*******");
System.out.println("*******");
System.out.println("*******");
}
/* (non-Javadoc)
* @see Shape#toString()
*/
public String toString() {
return super.toString() + "(Rectangles)";
}
/**
* calculates the area
*/
public void area() {
System.out.println("The area of a square is " + (length * width));
}
}
public class Square extends Shape {
Square (int length) {
super(length);
}
/**
* draws the line shape
*/
public void draw() {
System.out.println("****");
System.out.println("****");
System.out.println("****");
System.out.println("****");
}
/* (non-Javadoc)
* @see Shape#toString()
*/
public String toString() {
return super.toString() + "(Square)";
}
/**
* calculates the area
*/
public void area() {
System.out.println("The area of a square is " + (length * length));
}
}
Shape.java
public class Shape {
protected int length;
/**
* @param length
*/
Shape(int length) {
this.setLength(length);
}
/**
* @return the length
*/
public int getLength() {
return length;
}
/**
* @param length
* the length to set
*/
public void setLength(int length) {
this.length = length;
}
/**
* draws the shape
*/
public void draw() {
System.out.println("Can't draw - no specifics");
}
/**
* calculates the area
*/
public void area() {
System.out.println("Can't calc area - no specifics");
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#toString()
*/
public String toString() {
return "Length is " + length;
}
}
_______________
Line.java
public class Line extends Shape {
Line(int length) {
super(length);
}
/**
* draws the line shape
*/
public void draw() {
System.out.println("****");
}
/*
* (non-Javadoc)
*
* @see Shape#toString()
*/
public String toString() {
return super.toString() + "(Line)";
}
/**
* calculates the area
*/
public void area() {
System.out.println("The area of a line is " + 1);
}
}
___________________
Rectangles.java
public class Rectangles extends Shape {
private int width;
Rectangles(int length, int width) {
super(length);
this.setWidth(width);
}
/**
* @return the width
*/
public int getWidth() {
return width;
}
/**
* @param width
* the width to set
*/
public void setWidth(int width) {
this.width = width;
}
/**
* draws the line shape
*/
public void draw() {
System.out.println("*******");
System.out.println("*******");
System.out.println("*******");
System.out.println("*******");
}
/*
* (non-Javadoc)
*
* @see Shape#toString()
*/
public String toString() {
return super.toString() + "(Rectangles)";
}
/**
* calculates the area
*/
public void area() {
System.out.println("The area of a square is " + (length * width));
}
}
__________________
Square.java
public class Square extends Shape {
Square(int length) {
super(length);
}
/**
* draws the line shape
*/
public void draw() {
System.out.println("****");
System.out.println("****");
System.out.println("****");
System.out.println("****");
}
/*
* (non-Javadoc)
*
* @see Shape#toString()
*/
public String toString() {
return super.toString() + "(Square)";
}
/**
* calculates the area
*/
public void area() {
System.out.println("The area of a square is " + (length * length));
}
}
__________________
Test.java
import java.util.ArrayList;
public class Test {
public static void main(String[] args) {
//Creating an ArrayList which stores each class object
ArrayList<Shape> arl=new ArrayList<Shape>();
//Adding each object to the ArrayList
arl.add(new Shape(2));
arl.add(new Line(3));
arl.add(new Rectangles(2,3));
arl.add(new Square(4));
//Calling the methods on each class
for(int i=0;i<arl.size();i++)
{
arl.get(i).draw();
arl.get(i).area();
System.out.println(arl.get(i).toString());
System.out.println("______________");
}
}
}
___________________
Output:
Can't draw - no specifics
Can't calc area - no specifics
Length is 2
______________
****
The area of a line is 1
Length is 3(Line)
______________
*******
*******
*******
*******
The area of a square is 6
Length is 2(Rectangles)
______________
****
****
****
****
The area of a square is 16
Length is 4(Square)
______________
_________________Thank You
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