Builder設計模式：個人認爲，核心在於兩個類。Builder類和Director類。通過Builder類和Director類，把萬事萬物抽象爲部件和組裝兩部分。通過兩部分的配合，把最終的產品，展示給客戶。上圖，只組裝了一款產品。
公司做大以後，不僅可以提供一款產品。根據已有的功能多少和精簡，可以快速生產出多種的產品，只要不同的construct和Product就可以了。construct提供了三個功能，說明這是一款lenovo的thinkpadT430筆記本電腦。如果construct只提供了一個show功能，那可能就是聯想的平板了。
public interface Builder {
void call();
void show();
void work();
Product getResult();
}
public class Lenovo implements Builder {
private Product lenovo;
public void call() {
// TODO: implement
lenovo.setCallFun("lenovo call");
}
public void show() {
// TODO: implement
lenovo.setShowFun("lenovo show");
}
public void work() {
// TODO: implement
lenovo.setWorkFun("lenovo work");
}
public Product getResult() {
// TODO: implement
return this.lenovo;
}
public Lenovo() {
// TODO: implement
lenovo = new Product();
}
}
public class Product {
private String callFun;
private String showFun;
private String workFun;
public String getCallFun() {
return callFun;
}
public void setCallFun(String newCallFun) {
callFun = newCallFun;
}
public String getShowFun() {
return showFun;
}
public void setShowFun(String newShowFun) {
showFun = newShowFun;
}
public String getWorkFun() {
return workFun;
}
public void setWorkFun(String newWorkFun) {
workFun = newWorkFun;
}
}public class Director {
private Builder builder;
public Director(Builder builder) {
// TODO: implement
this.builder= builder;
}
public void construct() {
// TODO: implement
builder.call();
builder.show();
builder.work();
}
}public class CallBuilder {
private static Builder builder;
private static Director director;
private static Product product;
public static void main(String[] args) {
builder = new Lenovo();
director = new Director(builder);
director.construct();
product = builder.getResult();
System.out.println(product.getCallFun());
System.out.println(product.getShowFun());
System.out.println(product.getWorkFun());
}
}