Design Pattern:

Builder pattern builds a complex object using simple objects and using a step by step approach. This type of design pattern comes under creational pattern as this pattern provides one of the best ways to create an object. 模式：將物體的構建交給builder類 故事場景：NBA每個球隊都是由球員組成的,我想知道勇士隊是怎么構成的,我只要擁有球隊建造類暴露的build方法，然后內部實現是隱藏的 我可以吧庫里，杜蘭特等勇士隊，也可以把杜蘭特，威少組等 組成雷霆隊

杜蘭特 庫里

public interface Player {String name();}public class Curry implements Player {@Overridepublic String name() {return "Curry";}}public class Durant implements Player {@Overridepublic String name() {return "Durant";}}復制代碼

Team:用來組成team 與 TeamBuilder:具體組成哪個隊

public class Team {List<Player> team = new ArrayList<>();public void addPlayer(Player people){team.add(people);}public String getTeamPlayers(){StringBuilder sb = new StringBuilder();for (Player people: team){sb.append(people.name()).append(",");}return sb.toString();}}public class TeamBuilder {public Team warriors(){Team team = new Team();team.addPlayer(new Curry());team.addPlayer(new Durant());return team;}}復制代碼

實驗的開始

public class BuilderDemo {public static void main(String[] args) {TeamBuilder teamBuilder = new TeamBuilder();Team team = teamBuilder.warriors();System.out.println(team.getTeamPlayers());}}復制代碼

轉載于:https://juejin.im/post/5a378173f265da432c23f32c

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