原型模式

• 用原型实例指定创建对象的种类，并且通过拷贝这些原型创建新的对象。
• 就是从一个对象再创建另外一个可定制的对象，而且不需知道任何创造的细节。
• 
• 浅复制

  • public class WorkExperience{
    
        private String timeArea, compary;
    
    
        public String getTimeArea() {
            return timeArea;
        }
    
        public void setTimeArea(String timeArea) {
            this.timeArea = timeArea;
        }
    
        public String getCompary() {
            return compary;
        }
    
        public void setCompary(String compary) {
            this.compary = compary;
        }
    
       
    }
    
    
    
    /**
     * super.clone()，
     * 如果字段是值类型，则对该字段执行逐位复制
     * 如果字段是引用类型，则复制引用但不复制引用对象
     * 因此，原始对象及其复本引用同一对象
     * 浅复制指向的还是同一对象。所有的对其他对象的引用都仍然指向原来的对象。
     */
    public class Resume implements Cloneable {
    
        private String name, sex, age;
    
        private WorkExperience experience;
    
        /**
         * 无参构造方法
         */
        public Resume() {
    
        }
    
        /**
         * 有参构造方法
         *
         * @param name
         */
        public Resume(String name) {
            this.name = name;
            experience = new WorkExperience();
        }
    
        public String getSex() {
            return sex;
        }
    
        /**
         * 设置个人信息
         *
         * @param sex
         * @param age
         */
        public void SetPersonalInfo(String sex, String age) {
            this.sex = sex;
            this.age = age;
        }
    
        public WorkExperience getExperience() {
            return experience;
        }
    
        /**
         * 设置工作经历
         *
         * @param timeArea
         * @param compary
         */
        public void SetWorkExperience(String timeArea, String compary) {
            experience.setCompary(compary);
            experience.setTimeArea(timeArea);
        }
    
        public void Display() {
            System.out.println(name + " " + sex + " " + age);
            System.out.println("工作经历 " + experience.getTimeArea() + " " + experience.getCompary());
        }
    
        @Override
        public Object clone() throws CloneNotSupportedException {
           
            return super.clone();
        }
    }
    
    /**
     *  通过R1和R2的getExperience()、R1和R3的getExperience()对象比较可以看出，R1、R2、R3尽管显示了不同的数据，但是还是只想同一个对象
     *  通过R1和R2的getSex()、R1和R3的getSex()对象比较可以看出，R2在设置新值后显示与R1指向不同的对象，R3没有设置新的值则还是显示同一个对象。
     */
    public class TestUtil {
    
        public static void main(String[] args) throws CloneNotSupportedException {
            
            Resume r1 = new Resume("rabbit1");
            r1.SetPersonalInfo("女", "18");
            r1.SetWorkExperience("2001", "柠檬客");
            r1.Display();
    
            Resume r2 = (Resume) r1.clone();
            r2.SetPersonalInfo("男", "19");
            r2.SetWorkExperience("2003", "柠檬客1");
            r2.Display();
    
            System.out.println("R1和R2比较：" + (r1.getExperience() == r2.getExperience()));
            System.out.println("R1和R2的name比较：" + (r1.getSex() == r2.getSex()));
    
            Resume r3 = (Resume) r1.clone();
            r2.SetPersonalInfo("女", "18");
            r2.SetWorkExperience("2004", "柠檬客2");
            r2.Display();
            System.out.println("R1和R2比较：" + (r1.getExperience() == r3.getExperience()));
            System.out.println("R1和R2的name比较：" + (r1.getSex() == r2.getSex()));
    
    
    
        }
    }

     

  • 
• 深复制

  • public class WorkExperience implements Cloneable {
    
        private String timeArea, compary;
    
    
        public String getTimeArea() {
            return timeArea;
        }
    
        public void setTimeArea(String timeArea) {
            this.timeArea = timeArea;
        }
    
        public String getCompary() {
            return compary;
        }
    
        public void setCompary(String compary) {
            this.compary = compary;
        }
    
        @Override
        public Object clone() throws CloneNotSupportedException {
            return super.clone();
        }
    }
    
    
    /**
     * 实现原型模式的深复制
     */
    public class Resume implements Cloneable {
    
        private String name, sex, age;
    
        private WorkExperience experience;
    
        /**
         * 无参构造方法
         */
        public Resume() {
    
        }
    
        /**
         * 有参构造方法
         *
         * @param name
         */
        public Resume(String name) {
            this.name = name;
            experience = new WorkExperience();
        }
    
    
        private Resume(WorkExperience experience) throws CloneNotSupportedException {
            this.experience = (WorkExperience) experience.clone();
        }
    
    
        public String getSex() {
            return sex;
        }
    
        /**
         * 设置个人信息
         *
         * @param sex
         * @param age
         */
        public void SetPersonalInfo(String sex, String age) {
            this.sex = sex;
            this.age = age;
        }
    
        public WorkExperience getExperience() {
            return experience;
        }
    
        /**
         * 设置工作经历
         *
         * @param timeArea
         * @param compary
         */
        public void SetWorkExperience(String timeArea, String compary) {
            experience.setCompary(compary);
            experience.setTimeArea(timeArea);
        }
    
        public void Display() {
            System.out.println(name + " " + sex + " " + age);
            System.out.println("工作经历 " + experience.getTimeArea() + " " + experience.getCompary());
        }
    
        @Override
        public Object clone() throws CloneNotSupportedException {
            Resume r = new Resume(this.experience);
            r.name = this.name;
            r.sex = this.sex;
            r.age = this.age;
            return r;
        }
    }
    
    
    
    /**
     *
     */
    public class TestUtil {
    
        public static void main(String[] args) throws CloneNotSupportedException {
          
            Resume r1 = new Resume("rabbit1");
            r1.SetPersonalInfo("女", "18");
            r1.SetWorkExperience("2001", "柠檬客");
            r1.Display();
    
            Resume r2 = (Resume) r1.clone();
            r2.SetPersonalInfo("男", "19");
            r2.SetWorkExperience("2003", "柠檬客1");
            r2.Display();
    
            System.out.println("R1和R2比较：" + (r1.getExperience() == r2.getExperience()));
            System.out.println("R1和R2的name比较：" + (r1.getSex() == r2.getSex()));
    
            Resume r3 = (Resume) r1.clone();
            r2.SetPersonalInfo("女", "18");
            r2.SetWorkExperience("2004", "柠檬客2");
            r2.Display();
            System.out.println("R1和R2比较：" + (r1.getExperience() == r3.getExperience()));
            System.out.println("R1和R2的name比较：" + (r1.getSex() == r2.getSex()));
    
    
    
        }
    }

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