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Commit 65fd2fc

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author
deeper
committed
complete prototype
1 parent e354649 commit 65fd2fc

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6 files changed

+270
-3
lines changed

6 files changed

+270
-3
lines changed
Lines changed: 58 additions & 0 deletions
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package com.ruoxu.pattern.prototype.deep;
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public class Address implements Cloneable{
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// 城市
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private String city;
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// 区
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private String district;
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// 街道
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private String street;
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public Address(String city, String district, String street) {
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this.city = city;
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this.district = district;
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this.street = street;
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}
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public String getCity() {
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return city;
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}
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public void setCity(String city) {
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this.city = city;
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}
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public String getDistrict() {
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return district;
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}
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public void setDistrict(String district) {
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this.district = district;
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}
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public String getStreet() {
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return street;
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}
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public void setStreet(String street) {
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this.street = street;
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}
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@Override
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public String toString() {
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return "Address [city=" + city + ", district=" + district + ", street=" + street + "]";
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}
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@Override
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protected Address clone(){
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try {
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Address address = (Address) super.clone();
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return address;
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} catch (CloneNotSupportedException e) {
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e.printStackTrace();
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return null;
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}
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}
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}
Lines changed: 33 additions & 0 deletions
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package com.ruoxu.pattern.prototype.deep;
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/**
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* 从浅拷贝->深拷贝的变化就可以看出,只需把User中是【引用类型的成员变量】也实现Cloneable接口,
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* 重写clone方法,User的clone方法增加user.address = this.address.clone();即可。
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* 无论是User还是Address,实现clone方法都不需要管基本类型的数据和String类型,它们会自动拷贝。
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*
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* @author Limitless
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*
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*/
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public class Demo {
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public static void main(String[] args) {
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User origin = new User("李明",20,new Address("北京", "崇阳市", "柳州路"));
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System.out.println(origin);
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User clone = origin.clone();
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System.out.println(clone);
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clone.setName("东东");
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clone.setAge(80);
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clone.getAddress().setCity("上海");
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clone.getAddress().setDistrict("闵行区");
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clone.getAddress().setStreet("莘庄");
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// clone.setAddress(new Address("上海", "闵行区", "莘庄")); // 注意这种方式设置是错的,setAddress是一个新的对象,所以不影响origin
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System.out.println(clone);
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System.out.println(origin);
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// 从运行结果可以看出,clone的Address改变后,origin的Address 并不会跟着改变(深拷贝)。
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}
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}
Lines changed: 55 additions & 0 deletions
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package com.ruoxu.pattern.prototype.deep;
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public class User implements Cloneable{
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private String name;
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private int age;
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private Address address;
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public User(String name, int age, Address address) {
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super();
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this.name = name;
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this.age = age;
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this.address = address;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public int getAge() {
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return age;
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}
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public void setAge(int age) {
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this.age = age;
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}
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public Address getAddress() {
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return address;
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}
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public void setAddress(Address address) {
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this.address = address;
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}
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@Override
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public String toString() {
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return "User [name=" + name + ", age=" + age + ", address=" + address + "]";
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}
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@Override
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protected User clone() {
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try {
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User user = (User) super.clone();
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user.address = this.address.clone();
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return user;
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} catch (CloneNotSupportedException e) {
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e.printStackTrace();
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return null;
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}
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}
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}
Lines changed: 47 additions & 0 deletions
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package com.ruoxu.pattern.prototype.shallow;
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public class Address {
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// 城市
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private String city;
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// 区
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private String district;
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// 街道
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private String street;
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public Address(String city, String district, String street) {
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this.city = city;
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this.district = district;
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this.street = street;
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}
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public String getCity() {
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return city;
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}
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public void setCity(String city) {
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this.city = city;
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}
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public String getDistrict() {
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return district;
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}
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public void setDistrict(String district) {
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this.district = district;
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}
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public String getStreet() {
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return street;
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}
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public void setStreet(String street) {
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this.street = street;
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}
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@Override
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public String toString() {
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return "Address [city=" + city + ", district=" + district + ", street=" + street + "]";
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}
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}
Lines changed: 23 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
package com.ruoxu.pattern.prototype;
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package com.ruoxu.pattern.prototype.shallow;
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/**
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* 原型模式
@@ -8,11 +8,31 @@
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* 使用场景:如果类的初始化(构造函数)需要消耗很大的资源,如数据,硬件资源等,通过原型模式减少消耗,如果创建类的成本很小,那么就没必要使用此模式,直接new。
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* 使用方法:要让实例调用clone方法就需要让此类实现Cloneable接口(同Serializable类似,Cloneable接口只是个标签接口,不含任何方法),一般如果你的子类没有特殊需要而重写clone()方法就直接用super.clone() 就行了(原因略)。
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* 注意事项:原型模式是在内存中二进制流的拷贝,要比直接new性能要好得多,但是正因如此,构造函数是不会执行的。
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* @author Administrator
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*
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* 当然不一定非要实现Closeable接口,还可以将对象串行化,implements Serializable,但是串行化却很耗时,这里仅仅实现第一种。
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*
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* @author limitless
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*/
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public class Demo {
1516
public static void main(String[] args) {
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User origin = new User("小明",20,new Address("北京", "崇阳市", "柳州路"));
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System.out.println(origin);
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User clone = origin.clone();
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System.out.println(clone);
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clone.setName("东东");
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clone.setAge(80);
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clone.getAddress().setCity("上海");
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clone.getAddress().setDistrict("闵行区");
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clone.getAddress().setStreet("莘庄");
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// clone.setAddress(new Address("上海", "闵行区", "莘庄")); // 注意这种方式设置是错的,setAddress是一个新的对象,所以不影响origin
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System.out.println(clone);
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System.out.println(origin);
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// 从运行结果可以看出,clone的Address改变后,origin的Address也跟着改变(浅拷贝)。
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}
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}
Lines changed: 54 additions & 0 deletions
Original file line numberDiff line numberDiff line change
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package com.ruoxu.pattern.prototype.shallow;
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public class User implements Cloneable{
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private String name;
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private int age;
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private Address address;
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public User(String name, int age, Address address) {
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super();
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this.name = name;
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this.age = age;
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this.address = address;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public int getAge() {
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return age;
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}
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public void setAge(int age) {
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this.age = age;
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}
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public Address getAddress() {
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return address;
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}
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public void setAddress(Address address) {
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this.address = address;
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}
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@Override
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public String toString() {
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return "User [name=" + name + ", age=" + age + ", address=" + address + "]";
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}
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@Override
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protected User clone() {
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try {
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User user = (User) super.clone();
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return user;
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} catch (CloneNotSupportedException e) {
50+
e.printStackTrace();
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return null;
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}
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}
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}

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