图1 建造者模式【点击查看大图】
基本的知识点已在思维导图中，下面是demo
1，Builder
为创建一个产品对象的各个部件指定抽象接口
public interface PersonBuilder {
void buildHead();
void buildBody();
void buildFoot();
Person buildPerson();
}2，ConcreteBuilder
实现Builder的接口以构造和装配该产品的各个部件，定义并明确它所创建的表示，并提供一个检索产品的接口
class ManBuilder implements PersonBuilder {
Person person;
public ManBuilder() {
person = new Man();
}
public void buildHead() {
person.setHead("建造男人的头");
}
public void buildBody() {
person.setBody("建造男人的身体");
}
public void buildFoot() {
person.setFoot("建造男人的脚");
}
public Person buildPerson() {
return person;
}
}
class WomanBuilder implements PersonBuilder {
Person person;
public WomanBuilder() {
person = new Woman();
}
public void buildBody() {
person.setBody("建造女人的身体");
}
public void buildFoot() {
person.setFoot("建造女人的脚");
}
public void buildHead() {
person.setHead("建造女人的头");
}
public Person buildPerson() {
return person;
}
}3，Director
构造一个使用Builder接口的对象，指导构建过程
public class PersonDirector {
public Person constructPerson(PersonBuilder pb) {
pb.buildHead();
pb.buildBody();
pb.buildFoot();
return pb.buildPerson();
}
}4，Product
表示被构造的复杂对象。ConcreteBuilder创建该产品的内部表示并定义它的装配过程，包含定义组成部件的类，包括将这些部件装配成最终产品的接口
public class Person {
private String head;
private String body;
private String foot;
public String getHead() {
return head;
}
public void setHead(String head) {
this.head = head;
}
public String getBody() {
return body;
}
public void setBody(String body) {
this.body = body;
}
public String getFoot() {
return foot;
}
public void setFoot(String foot) {
this.foot = foot;
}
}
class Man extends Person {
public Man(){
System.out.println("开始建造男人");
}
}
class Woman extends Person {
public Woman(){
System.out.println("开始建造女人");
}
}5，Test验证代码
public class Test{
public static void main(String[] args) {
PersonDirector pd = new PersonDirector();
Person womanPerson = pd.constructPerson(new ManBuilder());
Person manPerson = pd.constructPerson(new WomanBuilder());
}
}