建造者模式
建造者模式适用场景：
建造一个复杂的对象适用，将构建对象的过程分开，每个类单独构造对象的一部分，最后组装起来，返回我们需要的对象。
下面的例子主要讲解构造一个飞船
demo：
//要获得的对象，但是各个组件要拆分开，让对应的类去实现
class airship {
private orbitamodule orbitamodule;//轨道舱
private engine engine; //发动机
private escapetower escapetower;//逃逸塔
public orbitamodule getorbitamodule() {
return orbitamodule;
}
public void setorbitamodule(orbitamodule orbitamodule) {
this.orbitamodule = orbitamodule;
}
public engine getengine() {
return engine;
}
public void setengine(engine engine) {
this.engine = engine;
}
public escapetower getescapetower() {
return escapetower;
}
public void setescapetower(escapetower escapetower) {
this.escapetower = escapetower;
}
}
class orbitamodule{
private string name;
public string getname() {
return name;
}
public void setname(string name) {
this.name = name;
}
public orbitamodule(string name) {
super();
this.name = name;
}
}
class engine{
private string name;
public string getname() {
return name;
}
public void setname(string name) {
this.name = name;
}
public engine(string name) {
super();
this.name = name;
}
}
class escapetower{
private string name;
public string getname() {
return name;
}
public void setname(string name) {
this.name = name;
}
public escapetower(string name) {
super();
this.name = name;
}
}
public interface airshipbuilder {
engine builderengine();
orbitamodule builderorbitamodule();
escapetower builderescapetower();
}
//创建返回对象的接口
public interface airshipdirector {
airship directairship();
}
//组装对象的实现类
public class airshipbuilderimpl implements airshipbuilder{
@override
public engine builderengine() {
system.out.println("构建发动机");
return new engine("发动机");
}
@override
public orbitamodule builderorbitamodule() {
system.out.println("构建逃逸塔");
return new orbitamodule("逃逸塔");
}
@override
public escapetower builderescapetower() {
system.out.println("构建轨道舱");
return new escapetower("轨道舱");
}
}
//返回对象的实现类
public class airshipdirectorimpl implements airshipdirector{
//创建一个构造组件的接口对象，此处可以使用工厂模式进行修改
private airshipbuilder airshipbuilder;
public airshipdirectorimpl(airshipbuilder airshipbuilder) {
super();
this.airshipbuilder = airshipbuilder;
}
@override
public airship directairship() {
engine builderengine = airshipbuilder.builderengine();
orbitamodule builderorbitamodule = airshipbuilder.builderorbitamodule();
escapetower builderescapetower = airshipbuilder.builderescapetower();
airship ship = new airship();
ship.setengine(builderengine);
ship.setescapetower(builderescapetower);
ship.setescapetower(builderescapetower);
return ship;
}
}
//客户端调用
public class client {
public static void main(string[] args) {
airshipdirector airshipdirector = new airshipdirectorimpl(new airshipbuilderimpl());
airship directairship = airshipdirector.directairship();
system.out.println(directairship);
}
}
建造者模式主要就是将建造飞船的过程简单的拆分开，让构建飞船的不同的组件让不同的类去完成，此处就可以和工厂模式和单例模式相结合，让开发变得更加清晰。
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