Java Clone sample Codes

Cloning in Java

import java.util.*;

/**

* This program demonstrates cloning.

*/

public class CloneTest

{

public static void main(String[] args)

{

try

{

Employee original = new Employee("John Q. Public", 50000);

original.setHireDay(2000, 1, 1);

Employee copy = original.clone();

copy.raiseSalary(10);

copy.setHireDay(2002, 12, 31);

System.out.println("original=" + original);

System.out.println("copy=" + copy);

}

catch (CloneNotSupportedException e)

{

e.printStackTrace();

}

}

}

class Employee implements Cloneable

{

public Employee(String n, double s)

{

name = n;

salary = s;

hireDay = new Date();

}

public Employee clone() throws CloneNotSupportedException

{

// call Object.clone()

Employee cloned = (Employee) super.clone();

// clone mutable fields

cloned.hireDay = (Date) hireDay.clone();

return cloned;

}

/**

* Set the hire day to a given date.

* @param year the year of the hire day

* @param month the month of the hire day

* @param day the day of the hire day

*/

public void setHireDay(int year, int month, int day)

{

Date newHireDay = new GregorianCalendar(year, month - 1, day).getTime();

// Example of instance field mutation

hireDay.setTime(newHireDay.getTime());

}

public void raiseSalary(double byPercent)

{

double raise = salary * byPercent / 100;

salary += raise;

}

public String toString()

{

return "Employee[name=" + name + ",salary=" + salary + ",hireDay=" + hireDay + "]";

}

private String name;

private double salary;

private Date hireDay;

}

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