java设计模式——原型模式

《大话设计模式》第九章

package ch09;

public class WorkExperience implements Cloneable {
	private String workDate = null;
	private String company = null;

	public String getWorkDate() {
		return workDate;
	}

	public void setWorkDate(String workDate) {
		this.workDate = workDate;
	}

	public String getCompany() {
		return company;
	}

	public void setCompany(String company) {
		this.company = company;
	}

	@Override
	protected Object clone() throws CloneNotSupportedException {
		WorkExperience workExperience = (WorkExperience)super.clone();
		workExperience.company = new String(this.company);
		workExperience.workDate = new String(this.workDate);
		return workExperience;
	}

}

package ch09;

public class Resume implements Cloneable {
	private String name = null;
	private String sex = null;
	private int age = 0;
	private WorkExperience workExperience = null;

	public Resume(String name) {
		this.name = name;
		this.workExperience = new WorkExperience();
	}

	public Resume(WorkExperience workExperience) throws CloneNotSupportedException {
		this.workExperience = (WorkExperience)workExperience.clone();
	}
	
	public void setPersonalInfo(String sex, int age) {
		this.age = age;
		this.sex = sex;
	}
	
	public void setWorkExperience(String workDate, String company) {
		this.workExperience.setWorkDate(workDate);
		this.workExperience.setCompany(company);
	}
	
	public void display() {
		System.out.println(name + ", " + sex + ", " + age);
		System.out.println(workExperience.getWorkDate() + ", " + workExperience.getCompany());
	}

	@Override
	protected Object clone() throws CloneNotSupportedException {
		Resume resume = new Resume(this.workExperience);
		resume.age = this.age;
		resume.name = this.name;
		resume.sex = this.sex;
		return resume;
	}
}

package ch09;

import java.text.SimpleDateFormat;

public class Client {
	SimpleDateFormat sdf = new SimpleDateFormat();

	/**
	 * @param args
	 * @throws CloneNotSupportedException 
	 */
	public static void main(String[] args) throws CloneNotSupportedException {
		Resume a = new Resume("大鸟");
		a.setPersonalInfo("男", 29);
		a.setWorkExperience("1998-2000", "X公司");
		
		Resume b = (Resume)a.clone();
		b.setWorkExperience("1998-2006", "Y公司");
		
		Resume c = (Resume)a.clone();
		c.setWorkExperience("1998-2003", "Z公司");
		
		a.display();
		b.display();
		c.display();
	}

}

原型模式，从字面意思来理解，不是很好理解，反正对我来说是这样的。原型模式其实就是克隆，必须实现Cloneable接口，然后要重写protected Object clone() throws CloneNotSupportedException这个方法。clone还分为浅复制和深复制。我的代码里的是深复制。