java app builder

very complex, or the sequence of calls in the product class produces different performance, when the builder mode can be used.4) During object creation, some other objects of the system are used, which are not readily available during the creation of the Product object, or can be encapsulated in the builder pattern to encapsulate the object's creation process. This scenario can only be a compensation metho

Java design pattern-constructor pattern (Builder) The build mode is the object creation mode. The construction mode separates the internal objects of a product from the production process of the product, so that a building process can generate product objects with different internal representations.Object Construction:In some cases, an object has some important properties and cannot be used as a complete pr

infinite recursion. note: This "Java Confusion" series are bloggers reading "Java doubts" The original book after the interpretation of the original book and examples of the adaptation and then write a post to publish. All examples are personally tested and shared on GitHub. Use these examples to motivate yourself to benefit others. At the same time, all the posts in this series will be published i

Java learning notes-builder mode of design mode (1): Learning note design modeI. Introduction Make a little progress every day and be happy every day. I insist on writing something every day. I feel very good. I can review basic knowledge and gain a sense of accomplishment. Why not? The design pattern is something a cainiao must master to become a master. Therefore, today's topic is the

Java builder Mode When you need to input multiple parameters to create an object, we usually write different constructors according to the number of parameters, as shown below: Public A (int ){} Public A (int a, int B ){} Public A (int a, int B, int c ){} Different constructors are called based on different parameters, but when there are too many parameters,This method is not flexible enoughSo the method fo

Today, I looked at the construction mode and came up with a bit of experience. Apply a theory first: the construction mode separates the internal appearance of a product from the product generation process, so that a building process generates product objects with different internal appearances. The construction mode allows the product's internal appearance to change independently, so that the customer does not have to know the details of the product's internal composition. The construction mode

Java Design Pattern builder PatternThis article continues to introduce the builder modes of the 23 design patterns series.Definition: builder mode: separates the construction of a complex object from its representation, so that different representations can be created during the same construction process.Scope 1: When

First, the builder model(Builder)The factory class pattern provides the pattern of creating a single class, while the builder pattern is to centralize the various products to manage, to create composite objects, so-called composite objects that refer to a class that has different properties, in fact the builder pattern

(string[] args) { persondirector pd = new Persondirector (); Person Womanperson = Pd.constructperson (New Manbuilder ()); Person Manperson = Pd.constructperson (New Womanbuilder ());} }The builder model can evolve in many forms during use: if there is only one concrete object to be built, the abstract builder and director can be omitted, allowing ConcreteBuilder to play the r

task. Second, the flexibility of such a constructor is not high, and you have to provide some meaningless parameter values at the time of invocation, for example, Dodocontact ("Ace",-1, "SH"), obviously the age of negative is meaningless, but you do not do so, to conform to Java specifications. If such code is released, the maintainer behind it will have a headache because he doesn't know what the 1 means. For such cases, it is very well suited to us

have to provide meaningless parameter values during calling, such as dodocontact ("Ace",-1, "sh"). Obviously, it doesn't make sense to have a negative age, but you don't need to do this, so it can comply with Java specifications. IfCodeAfter the release, the maintainer will have a headache because he does not know what this-1 means. In this case, the builder mode is very suitable. The main point of the

by a non static object. We can find the corresponding evidence from the output results.It is necessary to summarize the process of creating the object here. Consider a class named dog:(1) When an object of type dog is first created, or the dog class's static method/static field is first accessed, the Java interpreter must find Dog.class (search in the predefined classpath).(2) After the Dog.class is found (it creates a class object that will be learn

("CLOTHES"), Leather ("Leather"), Chain_mail ("CHAIN Mail"), Plate_mail ("PLATE Mail");Private String title;Armor (String title) {this.title = title;} @Override Public String toString () {return title; }}Profession.javaPublic enum Profession {WARRIOR, thief, MAGE, priest;@Override public String toString () {return name (). toLowerCase (); }}In the design of the implementation, we refer to "effective Java" second article "when encountering multiple co

("Part B"); the - } - - @Override + PublicProduct GetResult () { - //TODO auto-generated Method Stub + returnproduct; A } at - } - - Public classConcreteBuilder2 extends Builder { - - PrivateProduct Product =NewProduct (); in @Override - Public voidBuildparta () { toProduct.add ("Part x"); + - } the * @Override $ Public voidBUILDPARTB () {Panax NotoginsengProduct.add ("Part y"); - the } + A

I, Construction (builder) mode structure diagram The builder mode hides the product structure and product part construction process from the client, and separates the responsibility for directing the construction process from the responsibility of specific builder parts, achieve responsibility division and encapsulation. The construction mode creates all parts o

provide some meaningless parameter values at the time of invocation, for example, Dodocontact ("Ace",-1, "SH"), obviously the age of negative is meaningless, but you do not do so, to conform to Java specifications. If such code is released, the maintainer behind it will have a headache because he doesn't know what the 1 means. For such cases, it is very well suited to use the builder mode. The key point of

Builder modeldefinitionAlso called the generator pattern, it can abstract the construction process of complex objects (abstract categories) so that different implementations of this abstract process can construct objects of different performance (attributes). When the algorithm for creating a complex object should be independent of the part of the object, and the construction process must allow different representations of the constructed object. We

attack power value and color to generate a weapon, and finally return the generated weapon. The Java code is as follows: Class Weapon {private String color; private String name; private int attack; public String getName () {return name;} public int getAttack () {return attack;} public String getColor () {return color;} public void setAttack (int _ attack) {attack = _ attack;} public void setName (String _ name) {name = _ name ;} public void setColor

construction Process There is a cost to creating the builder //Example Builder mode Public classnutritionfacts {Private Final intServingsize;//Required Parameters Private Final intservings;//Required Parameters Private Final intFat//Optional Parameters Private Final intSodium//Optional Parameters Public Static classBuilder {Private Final intservingsize; Private Final intser

; } Public Static voidMain (string[] args) {Builderdemo demo=NewBuilder (calories). Carbohydrate (43). build (); }}Such code is easy to write and read. Furthermore, constraints can be imposed on their parameters, and the build method can examine these constraints, copy the parameters from the builder to the object, and test them in the object domain.Insufficient builder mode: 1. You need to create the