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  • subclass

    2016-11-04 01:50:03
    subclass 这个词的意思和我想象中不太一样  例子 We want to create a subclass of Person called CollegeKid, which represents someone who is attending college. 写出的代码是这样的 public class ...

    subclass 这个词的意思和我想象中不太一样 

    例子 We want to create a subclass of Person called CollegeKid, which represents someone who is attending college.

    写出的代码是这样的

    public class CollegeKid extends Person
    {
       private double gpa;

      
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    public CollegeKid (String n, int a, double g) {
      super(n, a);
      /* the rest here */
      gpa = g;
    }
     


       public double getGPA ()
       {
          return gpa;
       }

       public void setGPA (double g)
       {
          gpa = g;
       }

    // end class

    展开全文
  • SubClass

    2020-03-16 01:26:12
    // 下面编译时类型和运行时类型完全一样,因此不存在多态 SubClass sc = new SubClass(); // 输出"轻量级Java EE企业应用实战" System.out.println(sc.book); // 下面调用将执行从父类继承到的base()方法...
    
    
    /**
     * Description:
     * 网站: <a href="http://www.crazyit.org">疯狂Java联盟</a><br>
     * Copyright (C), 2001-2018, Yeeku.H.Lee<br>
     * This program is protected by copyright laws.<br>
     * Program Name:<br>
     * Date:<br>
     * @author Yeeku.H.Lee kongyeeku@163.com
     * @version 1.0
     */
    class BaseClass
    {
    	public int book = 6;
    	public void base()
    	{
    		System.out.println("父类的普通方法");
    	}
    	public void test()
    	{
    		System.out.println("父类的被覆盖的方法");
    	}
    }
    public class SubClass extends BaseClass
    {
    	//重新定义一个book实例变量隐藏父类的book实例变量
    	public String book = "轻量级Java EE企业应用实战";
    	public void test()
    	{
    		System.out.println("子类的覆盖父类的方法");
    	}
    	public void sub()
    	{
    		System.out.println("子类的普通方法");
    	}
    	public static void main(String[] args)
    	{
    		// 下面编译时类型和运行时类型完全一样,因此不存在多态
    		BaseClass bc = new BaseClass();
    		// 输出 6
    		System.out.println(bc.book);
    		// 下面两次调用将执行BaseClass的方法
    		bc.base();
    		bc.test();
    		// 下面编译时类型和运行时类型完全一样,因此不存在多态
    		SubClass sc = new SubClass();
    		// 输出"轻量级Java EE企业应用实战"
    		System.out.println(sc.book);
    		// 下面调用将执行从父类继承到的base()方法
    		sc.base();
    		// 下面调用将执行从当前类的test()方法
    		sc.test();
    		// 下面编译时类型和运行时类型不一样,多态发生
    		BaseClass ploymophicBc = new SubClass();
    		// 输出6 —— 表明访问的是父类对象的实例变量
    		System.out.println(ploymophicBc.book);
    		// 下面调用将执行从父类继承到的base()方法
    		ploymophicBc.base();
    		// 下面调用将执行从当前类的test()方法
    		ploymophicBc.test();
    		// 因为ploymophicBc的编译类型是BaseClass,
    		// BaseClass类没有提供sub方法,所以下面代码编译时会出现错误。
    		// ploymophicBc.sub();
    	}
    }
    
    
    展开全文
  • Subclass

    千次阅读 2004-08-05 10:13:00
    The application passes the GWL_WNDPROC flag, the handle to the window to subclass, and the address of the subclass procedure to SetWindowLong . The subclass procedure can reside in either the ...

    Window Procedure Subclassing

    When an application creates a window, the system allocates a block of memory for storing information specific to the window, including the address of the window procedure that processes messages for the window. When the system needs to pass a message to the window, it searches the window-specific information for the address of the window procedure and passes the message to that procedure.

    Subclassing is a technique that allows an application to intercept and process messages sent or posted to a particular window before the window has a chance to process them. By subclassing a window, an application can augment, modify, or monitor the behavior of the window. An application can subclass a window belonging to a system global class, such as an edit control or a list box. For example, an application could subclass an edit control to prevent the control from accepting certain characters. However, you cannot subclass a window or class that belongs to another application. All subclassing must be performed within the same process.

    An application subclasses a window by replacing the address of the window's original window procedure with the address of a new window procedure, called the subclass procedure. Thereafter, the subclass procedure receives any messages sent or posted to the window.

    The subclass procedure can take three actions upon receiving a message: it can pass the message to the original window procedure, modify the message and pass it to the original window procedure, or process the message and not pass it to the original window procedure. If the subclass procedure processes a message, it can do so before, after, or both before and after it passes the message to the original window procedure.

    The system provides two types of subclassing: instance and global. In instance subclassing, an application replaces the window procedure address of a single instance of a window. An application must use instance subclassing to subclass an existing window. In global subclassing, an application replaces the address of the window procedure in the WNDCLASS structure of a window class. All subsequent windows created with the class have the address of the subclass procedure, but existing windows of the class are not affected.

    Instance Subclassing

    An application subclasses an instance of a window by using the SetWindowLong function. The application passes the GWL_WNDPROC flag, the handle to the window to subclass, and the address of the subclass procedure to SetWindowLong. The subclass procedure can reside in either the application's executable or a dynamic-link library (DLL).

    SetWindowLong returns the address of the window's original window procedure. The application must save the address, using it in subsequent calls to the CallWindowProc function, to pass intercepted messages to the original window procedure. The application must also have the original window procedure address to remove the subclass from the window. To remove the subclass, the application calls SetWindowLong again, passing the address of the original window procedure with the GWL_WNDPROC flag and the handle to the window.

    The system owns the system global classes, and aspects of the controls might change from one version of the system to the next. If the application must subclass a window that belongs to a system global class, the developer may need to update the application when a new version of the system is released.

    Because instance subclassing occurs after a window is created, you cannot add any extra bytes to the window. Applications that subclass a window should use the window's property list to store any data needed for an instance of the subclassed window. For more information, see Window Properties.

    When an application subclasses a subclassed window, it must remove the subclasses in the reverse order they were performed. If the removal order is not reversed, an unrecoverable system error may occur.

    Global Subclassing

    To globally subclass a window class, the application must have a handle to a window of the class. The application also needs the handle to remove the subclass. To get the handle, an application typically creates a hidden window of the class to be subclassed. After obtaining the handle, the application calls the SetClassLong function, specifying the handle, the GCL_WNDPROC flag, and the address of the subclass procedure. SetClassLong returns the address of the original window procedure for the class.

    The original window procedure address is used in global subclassing in the same way it is used in instance subclassing. The subclass procedure passes messages to the original window procedure by calling CallWindowProc. The application removes the subclass from the window class by calling SetClassLong again, specifying the address of the original window procedure, the GCL_WNDPROC flag, and the handle to a window of the class being subclassed. An application that globally subclasses a control class must remove the subclass when the application terminates; otherwise, an unrecoverable system error may occur.

    Global subclassing has the same limitations as instance subclassing, plus some additional restrictions. An application should not use the extra bytes for either the class or the window instance without knowing exactly how the original window procedure uses them. If the application must associate data with a window, it should use window properties

    展开全文
  • subclass axiom

    2020-12-09 04:56:07
    (instance subclass BinaryPredicate) (instance subclass PartialOrderingRelation) (domain subclass 1 SetOrClass) (domain subclass 2 SetOrClass) ... (=> (subclass ?X ?Y) (and (instance ?X ...
  • NodeLinter subclass

    2020-11-30 08:19:01
    <div><p>This is the NodeLinter subclass that linter executables installed locally in <code>node_modules/.bin/</code> can subclass from. <p>This is my first time writing python code. Advice and ...
  • Subclass?

    2020-12-28 07:01:06
    ve been trying to subclass <code>AcknowListViewController</code> so I can customize the textLabel appearance in the <code>cellForRowAtIndexPath</code> method. Unfortunately, I can't seem to get ...
  • Instance of Subclass, Subclass, Instance of Superclass, Superclass,及方法直接的关系
  • <div><p>Currently it is not possible to subclass OverlayContainerViewController, afaik. Xcode error message: "Cannot inherit from non-open class 'OverlayContainerViewController' outside of...
  • Extract Subclass

    2018-07-07 21:14:03
    Refactoring Day 20 : Extract Subclass Todays refactoring comes from Martin Fowlers catalog of patterns. You can find this refactoring in his catalog here This refactoring is useful when you have ...
    Refactoring Day 20 : Extract Subclass 
     
    Todays refactoring comes from Martin Fowlers catalog of patterns. You can find this refactoring in his catalog here 
    This refactoring is useful when you have methods on a base class that are not shared amongst all classes and needs to be pushed down into it’s own class. The example I’m using here is pretty straightforward. We start out with a single class called Registration. This class handles all information related to a student registering for a course. 
       1: public class Registration    2: {    3:     public NonRegistrationAction Action { get; set; }    4:     public decimal RegistrationTotal { get; set; }    5:     public string Notes { get; set; }    6:     public string Description { get; set; }    7:     public DateTime RegistrationDate { get; set; }    8: } 
     
    There is something that we’ve realized after working with this class. We are using it in two different contexts. The properties NonRegistrationAction and Notes are only ever used when dealing with a NonRegistration which is used to track a portion of the system that is slightly different than a normal registration. Noticing this, we can extract a subclass and move those properties down into the NonRegistration class where they more appropriately fit. 
       1: public class Registration    2: {    3:     public decimal RegistrationTotal { get; set; }    4:     public string Description { get; set; }    5:     public DateTime RegistrationDate { get; set; }    6: }    7:      8: public class NonRegistration : Registration    9: {   10:     public NonRegistrationAction Action { get; set; }   11:     public string Notes { get; set; }   12: }   
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  • POC Point subclass

    2020-12-02 08:58:33
    <div><p>This makes pygeos.Geometry subclassable and uses tp_base to quickly check if an object is a Geometry subclass.</p><p>该提问来源于开源项目:pygeos/pygeos</p></div>
  • <div><p>Is it possible to serialize a vector of shared_ptr to a templatized subclass as outlined in this question here: http://stackoverflow.com/questions/23035263/serialize-templatized-sub-class</p> ...
  • Cannot subclass Loader

    2020-12-01 22:51:55
    <div><p><code>Loader.prototype.constructor</code> is not correctly set, which means that a <code>super</code> call from a subclass constructor does not call the <code>Loader</code> constructor (see ~...
  • subclass-dance-party-源码

    2021-03-30 13:20:33
    subclass-dance-party
  • # Random stuff here, but no subclass implementations of #new, #description or other stuff. end </code></pre> <p>and the following schema: <pre><code> entity "Player" do string :id ...
  • 继承映射 需求: 父类:动物 子类: 猫 猴子  简单继承映射 (3个表,3个映射文件)(有多少个子类,写多少个映射文件) ...使用subclass的继承映射 (1个表...使用union-subclass的继承映射(2个表,1个映
  • <div><p>For my needs I am really needing to subclass your control directly from UICollectionViewFlowLayout rather than having it be UICollectionViewLayout. I have gotten it to work by just commenting ...
  • Add subclass hierarchy test

    2020-12-09 01:18:59
    <div><p>This test can help us find cycles in the subclass hierarchy.</p><p>该提问来源于开源项目:BrickSchema/Brick</p></div>
  • <div><p>I am perhaps being dense, but how exactly can one subclass BaseDestination in order to override the requisite methods when those methods are not <code>public</code>?</p><p>该提问来源于开源项目...
  • <div><p>Subclass Methods from collections.MutableMapping rather than dict. <p>Gives the ability to validate any additions to the methods.</p><p>该提问来源于开源项目:bcb/jsonrpcserver</p></div>
  • <div><p>This branch moves a lot of code around and will be cleaned up a lot more when we have the service inspector subclass as well. <p><strong>To QA Do extensive exploratory QA on anything that ...
  • <p>I would switch to I’m trying to implement argo on an NSManagedObject subclass however when I implement JSONDecodable Xcode is unable to finish building. <p>Is this an issue with how I am trying to...
  • <p>Is there an alternative to creating my own namespace object and assigning all of the classes into it so that it can be passed into <code>maria.subclass</code> short of recreating all of the ...
  • Bind subclass to superclass

    2020-11-30 01:12:11
    <p>This would allow a parameter typed to an Abstract superclass to be satisfied by a Concrete subclass. <p>The method signature would look like this: - (void)bindClass:(id)aClass toClass:(Class)bClass...
  • def __init_subclass__(cls): if not hasattr(cls, '_op'): raise AttributeError("XYZ") if cls._op is OperationType.CALL: </code></pre> <pre><code> restrict/restrict.py:22:11: E1101: ...
  • JESD204B协议是用于数据转换器与FPGA/ASIC之间数据传输的高速串行协议,Subclass1模式是该协议完成确定性延时功能的重要模式。对JESD204B协议Subclass1模式的工作原理和时钟设计要求进行分析,并总结出Subclass1模式...
  • <div><p>If I look at the details of subclass, I get this: <p><img alt="image" src="https://user-images.githubusercontent.com/25425159/41513926-b5c00bea-72e1-11e8-8db5-eb048df6ab8a.png" /></p> <p>I can...

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