浅谈Java设计模式之原型模式知识总结
如何使用?
1.首先定义一个User类,它必须实现了Cloneable接口,重写了clone()方法。
public class User implements Cloneable { private String name; private int age; private Brother brother; @Override protected Object clone() throws CloneNotSupportedException { return super.clone(); } }
2.Brother类
public class Brother{ private String name; }
3.应用演示类
public class PrototypeDemo { public static void main(String[] args) throws CloneNotSupportedException { User user1 = new User(); user1.setName("秋红叶"); user1.setAge(20); Brother brother1 = new Brother(); brother1.setName("七夜圣君"); user1.setBrother(brother1); // 我们从克隆对象user2中修改brother,看看是否会影响user1的brother User user2 = (User) user1.clone(); user2.setName("燕赤霞"); Brother brother2 = user2.getBrother(); brother2.setName("唐钰小宝"); System.out.println(user1); System.out.println(user2); System.out.println(user1.getBrother() == user2.getBrother()); } }
4.深拷贝写法
这是User类
public class User implements Cloneable { private String name; private int age; private Brother brother; /** * 主要就是看这个重写的方法,需要将brother也进行clone */ @Override protected Object clone() throws CloneNotSupportedException { User user = (User) super.clone(); user.brother = (Brother) this.brother.clone(); return user; } }
这是Brother类
public class Brother implements Cloneable{ private String name; @Override protected Object clone() throws CloneNotSupportedException { return super.clone(); } }
这里是结果演示
public class PrototypeDemo { public static void main(String[] args) throws CloneNotSupportedException { User user1 = new User(); user1.setName("秋红叶"); user1.setAge(20); Brother brother1 = new Brother(); brother1.setName("七夜圣君"); user1.setBrother(brother1); // 我们从克隆对象user2中修改brother,看看是否会影响user1的brother User user2 = (User) user1.clone(); user2.setName("燕赤霞"); Brother brother2 = user2.getBrother(); brother2.setName("唐钰小宝"); System.out.println(user1); System.out.println(user2); System.out.println(user1.getBrother() == user2.getBrother()); } }
可以看到,user1的brother没有受到user2的影响,深拷贝成功!
5.图解深拷贝与浅拷贝
总结与思考
java中object类的clone()方法为浅拷贝必须实现Cloneable接口如果想要实现深拷贝,则需要重写clone()方法
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