java 对象深度克隆

package com.test.clone;

import java.util.*;

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 {
	private String name;
	private double salary;
	private Date hireDay;

	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;
	}

	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 + "]";
	}

}

 

评论

1 楼 junJZ_2008 2010-05-06  

可以使用反射来实现，可参考：http://www.iteye.com/topic/659877#1484197