原型模式

使用场景：
（1）类初始化需要消耗非常多的资源时，通过拷贝可以避免一些消耗；
（2）通过new对象需要非常繁琐的数据准备或者访问权限时；
（3）一个对象需要提供给其他对象访问，而且各个对象可能需要修改其值时，可保护性拷贝（浅拷贝和深拷贝）

Class Diagram.png

private void test(){
    address = new Address("gz","th","sp");
    user = new User(10,"jack","18138780689",address);
    Log.e(TAG,user.toString());
    try {
        userClone = user.clone();
        Log.e(TAG,userClone.toString());
    } catch (CloneNotSupportedException e) {
        e.printStackTrace();
    }
    userClone.address.city = "sz";
    userClone.phoneNum = "18028512904";
    Log.e(TAG,userClone.toString());
    Log.e(TAG,user.toString());
}

'''
public class Address implements Cloneable{
public String city;
public String district;
public String street;

public Address(String city, String district, String street) {
    this.city = city;
    this.district = district;
    this.street = street;
}

@Override
public String toString() {
    return "Address{" +
            "city='" + city + '\'' +
            ", district='" + district + '\'' +
            ", street='" + street + '\'' +
            '}';
}

@Override
protected Address clone() throws CloneNotSupportedException {
    return (Address) super.clone();
}

}
'''