import java.lang.constant.Constable;
import java.util.*;
//本程序演示了克隆 功能 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
{
//调用Object.clone()
Employee cloned=(Employee) super.clone();
//克隆可以更改的字段
cloned.hireDay=(Date) hireDay.clone();
return cloned;
}
public String getName()
{
return name;
}
public double getSalary() {
return salary;
}
public void setHireDay(int year,int month,int day)
{
Date newHireDay=new GregorianCalendar(year,month-1,day).getTime();
hireDay.setTime(newHireDay.getTime());
}
public Date getHireDay()
{
return hireDay;
}
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;
}
运行结果：
Original=Employee[name=John Q.Public,salary=50000.0hireDay=Sat Jan 01 00:00:00 CST 2000] Copy=Employee[name=John Q.Public,salary=55000.0hireDay=Tue Dec 31 00:00:00 CST 2002]
