寻找一种工具:
无法完成此任务的工具包括:
有任何想法吗?
我有以下代码:
public abstract class A ...
public class B : A ...
public class C : A ...
void my_fct(A x) {
if (x is B) { block_1 }
else if (x is C) { block_2 }
else { block_3 }
}
Run Code Online (Sandbox Code Playgroud)
我想知道它是否是来自F#的良好翻译
type a = B | C
let my_fct x =
match x with
| B -> ( block_1 )
| C -> ( block_2 )
| _ -> ( block_3 )
Run Code Online (Sandbox Code Playgroud)
??
目前它是主要活动,但我想将其更改为Categories活动.这是问题所在吗?
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
// This ID represents the Home or Up button. In the case of this
// activity, the Up button is shown. Use NavUtils to allow users
// to navigate up one level in the application structure. For
// more details, see the Navigation pattern on Android Design:
//
// http://developer.android.com/design/patterns/navigation.html#up-vs-back
//
NavUtils.navigateUpFromSameTask(this);
return true;
}
return super.onOptionsItemSelected(item);
Run Code Online (Sandbox Code Playgroud) 我正在寻找一个图表,显示内置类型的JavaScript Function,String但在谷歌我一直在寻找与浏览器相关的东西,如图Window.
我只是在寻找纯粹的js对象图.我知道ECMA规范,但我正在寻找一个图表,因为我是一个视觉类型.
我正在寻找一种方法来创建相同类的两个或多个实例之间的子父关系形式的层次结构.
如何在嵌套字典中创建这样的对象,例如?这甚至可能吗?是否还有其他方法可以推荐这样的任务?
# -*- coding: utf-8 -*-
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import create_engine, exists
from sqlalchemy.orm import relationship, sessionmaker
from sqlalchemy.schema import Column, ForeignKey
from sqlalchemy.types import Integer, String
Base = declarative_base()
class Person(Base):
__tablename__ = 'person';
id = Column(Integer, primary_key=True)
name = Column(String, nullable=False)
parent_id = Column(Integer, ForeignKey('person.id'))
def __init__(self, **kwargs):
self.parent_id = kwargs.get('parent_id', None)
self.name = kwargs.get('name')
self.team = kwargs.get('team', [])
# Is it possible to create more object of this type
# and establish that …Run Code Online (Sandbox Code Playgroud) 你如何改变NHibernate中行的子类型?例如,如果我有一个Customer实体和TierOneCustomer的子类,我有一个案例需要将Customer更改为TierOneCustomer,但TierOneCustomer应该具有与原始Customer实体相同的Id(PK).
映射看起来像这样:
<class name="Customer" table="SiteCustomer" discriminator-value="C">
<id name="Id" column="Id" type="Int64">
<generator class="identity" />
</id>
<discriminator column="CustomerType" />
... properties snipped ...
<subclass name="TierOneCustomer" discriminator-value="P">
... more properties ...
</subclass>
</class>
Run Code Online (Sandbox Code Playgroud)
我正在使用每个类的单表层次结构模型,因此使用plain-sql,只需要对鉴别器(CustomerType)进行sql更新,并设置与该类型相关的相应列.我无法在NHibernate中找到解决方案,所以会感激任何指针.
考虑到这个用例,我也在考虑模型是否正确,但在我沿着这条路走下去之前,我想确保首先按照上述方式进行操作.如果没有,我几乎肯定会考虑改变模型.
问题
我试图避免代码如下所示:
If(object Is Man)
Return Image("Man")
ElseIf(object Is Woman)
Return Image("Woman")
Else
Return Image("Unknown Object")
Run Code Online (Sandbox Code Playgroud)
我认为我可以通过方法重载来实现这一点,但它总是选择最少的派生类型,我认为这是因为重载是在编译时确定的(与重写不同),因此只能在以下代码中假设基类:
代码结构:
NS:Real
RealWorld (Contains a collection of all the RealObjects)
RealObject
Person
Man
Woman
NS:Virtual
VirtualWorld (Holds a reference to the RealWorld, and is responsible for rendering)
Image (The actual representation of the RealWorldObject, could also be a mesh..)
ArtManager (Decides how an object is to be represented)
Run Code Online (Sandbox Code Playgroud)
代码实现(关键类):
class VirtualWorld
{
private RealWorld _world;
public VirtualWorld(RealWorld world)
{
_world = world;
} …Run Code Online (Sandbox Code Playgroud) 是否有任何工具可以使用Django应用程序的目录,扫描模板并绘制/打印/列出模板之间的继承层次结构?
在这样的工具中,查看在每个级别覆盖哪些块将是一个特别有用的功能.
我在eclipse中打开了Java的类层次结构视图,它显示了一些任意类,与我的编辑器或其他显然无关的类.
Link with editor 选项已启用且无效.
怎么修?
UPDATE
Link with editor在Hierarchy view:

对于库(.NET Standard 2.0),我设计了一些大致如下所示的类:
public class MyContext
{
// wraps something important.
// It can be a native resource, a connection to an external system, you name it.
}
public abstract class Base
{
public Base(MyContext context)
{
Context = context;
}
protected MyContext Context { get; private set; }
// methods
}
public class C1 : Base
{
public C1(MyContext context, string x)
: base(context)
{
// do something with x
}
// methods
}
public class C2 : Base …Run Code Online (Sandbox Code Playgroud) c# design-patterns class-design class-hierarchy .net-standard
class-hierarchy ×10
c# ×3
java ×3
python ×2
android ×1
c#-to-f# ×1
call-graph ×1
class-design ×1
django ×1
eclipse ×1
f# ×1
javascript ×1
nhibernate ×1
overloading ×1
parent-child ×1
recursion ×1
sqlalchemy ×1
templates ×1
uml ×1