builder

问题 I'm using a UITableView to display custom cells created with Interface Builder. The table scrolling isn't very smooth (it "stutters") which leaves me to believe cells aren't being reused. Is there something wrong with this code? - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"TwitterCell"; TwitterCell *cell = (TwitterCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil)

问题 I know there are many variations and related topics to this one here on stack overflow but I haven't found any compelling answers so I'll give it a go myself. I'm trying to design a builder factory that returns different subclasses of a common builder interface. I want to allow all the implementations to share a common abstract class for code re-use. Note that I'm not interested in the return type of the build() method, only what types the builders are. This is what I have so far: Builder

问题 I'm familiar with using the builder pattern with generics and subclassing, but I can't see how to make it work with a non-trivial tree of subclasses (i.e. C extends B extends A). Here's a simple example of what I'm trying to do: class A { private final int value; protected A(ABuilder builder) { this.value = builder.value; } public int getValue() { return value; } public static class ABuilder<T extends ABuilder<T>> { private int value; public T withValue(int value) { this.value = value; return

问题 I have this pojo file that consists over 50 attributes. Creating a manual builder class can be error prone activity. Is there a easy way to generate the builder class? for e.g. If you required to generate getter setters you would normally use eclipse Source > Generate Getters and Setters Is there a painless procedure to perform this? Really appreciate any help.. 回答1: Use Lombok. You can annotate your class, for example: @Data //generate getters and setters @EqualsAndHashCode(callSuper=true) /

问题 I have a certain class structure that looks something like this: class Parent { public Parent(int property) { /* use property */} } class Son extends Parent { public Son(int parentProperty, String sonProperty) { super(parentProperty); /* use son property */ } } I'd like to create builders for both these classes such that: class ParentBuilder { protected int parentProperty; public ParentBuilder parentProperty(int parentPropertyValue) { parentPropertyValue = parentPropertyValue; return this; }

问题 A project we've been working on for weeks in Flash Builder suddenly has stopped being navigable: all the nice features of Flash Builder like auto-completion, jump to definition, even search for References are only partially working -- they work for some classes but not for others. I've tried restarting Flash Builder, closing and opening the project, re-creating the project, but this bad situation persists. Moreover, it happened at about the same time for 2 other developers on the same project

问题 Which of the following is the better approach to implement the builder pattern? 1) Using the object to build instead of all its properties in the builder (and create it in the builder constructor): public class Person { private String firstName; // other properties ... private Person() {} // getters ... public static class Builder { // person object instead of all the person properties private Person person; public Builder() { person = new Person(); } public Builder setFirstName(String

问题 I am trying to create an immutable builder of an immutable class that contains a Set. It should be an immutable set really but for now I have to use the regular JCF classes. Using the standard pizza example, I have the pizza base as a mandatory parameter and toppings as optional, 0 or more allowed. I imagine that each call to addToppings() will create a new immutable builder with a set of toppings and then finally when build is called the Pizza object will be delivered. I just don't know how

问题 I am trying to create an immutable builder of an immutable class that contains a Set. It should be an immutable set really but for now I have to use the regular JCF classes. Using the standard pizza example, I have the pizza base as a mandatory parameter and toppings as optional, 0 or more allowed. I imagine that each call to addToppings() will create a new immutable builder with a set of toppings and then finally when build is called the Pizza object will be delivered. I just don't know how

问题 According to the book Design Patterns: Elements of Reusable Object-Oriented Software,: The Builder Pattern separates the construction of a complex object from its representation so that the same construction process can create different representations. In general the Builder pattern solves the issue with large number of optional parameters and inconsistent state by providing a way to build the object step-by-step and provide a method that will actually return the final Object. With the