//Create an abstract class, which has not objects, but specifies the

//attributes and methods for the members of the class.

public abstract class Assets {

//Define the private variables to “hide” the real values.

private String sAccountNumber;

private String sAccountName;

private double dOriginalValue;

private double dDepreciatedValue;

public Assets( String sNumber, String sName, double dValue )

//Define the public variables to share values.

{

sAccountNumber = sNumber;

sAccountName = sName;

dOriginalValue = dValue;

dDepreciatedValue = dValue;

}

//Define the methods that all assets will inherit.

public abstract double computeDepreciation();

public String getAccountNumber() { return sAccountNumber; }

public String getAccountName() { return sAccountName; }

public double getOriginalValue() { return dOriginalValue; }

public double getDepreciatedValue() { return dDepreciatedValue; }

public void setDepreciatedValue() { dDepreciatedValue = computeDepreciation();

}

}

//Define how depreciation is to be computed for computers

public class Computer extends Assets {

private double dNewValue;

public Computer(String sAccount, String sName, double dOriginalVal )

{ super(sAccount, sName, dOriginalVal); }

//Over-ride the computeDepreciation method in the abstract class.

public double computeDepreciation()

{

dNewValue = super.getDepreciatedValue() * 0.667;

return dNewValue;

}

}

//Define how depreciation is to be computed for buildings

public class Building extends Assets {

private double newDeprValue;

public Building (String sAccount, String sName, double dBalance )

{ super(sAccount, sName, dBalance); }

public double computeDepreciation()

{

newDeprValue = 0.95 * super.getDepreciatedValue();

return newDeprValue;

}

}

import java.awt.*;

import java.awt.event.*;

import java.applet.*;

//Define the class to create some accounts (i.e., account objects)

public class CreateAccounts extends Applet {

public void paint (Graphics g)

{

//Reference the assets class.

//The Assets.class file must be in the same directory.

Assets ref;

// Create two new computers, a1 and a2

Assets a1 = new Computer ( "1", "Computer a1", 1500.00 );

Assets a2 = new Computer ( "2", "Computer a2", 2500.00 );

// Create a new building, b

Assets b = new Building ( "456", "Building 1", 100000.00 );

//Refer to asset a1.

//Since a1 is a computer the depreciation method for comuters will be used.

ref = a1;

g.drawString("Depreciated value of computer a1 is " + a1.computeDepreciation(), 25, 25 );

//Refer to asset a2.

//Since a2 is a computer the depreciation method for comuters will be used.

ref = a2;

g.drawString("Depreciated value of computer a2 is " + a2.computeDepreciation(), 25, 50 );

//Refer to asset b.

//Since b is a computer the depreciation method for comuters will be used.

ref = b;

g.drawString("Depreciated value of building 1 is " + b.computeDepreciation(), 25, 75 );

}

}