迪米特法则 定义：如果两个软件实体无需直接通信，那么就不应当发生直接的相互调用，可以通过第三方转发该调用，其目的是降低耦合，提高模块的相对独立性以明星和经纪人为例：Agentpublic class Agent { private Star star; private Fans fans; private Company company; public Star getStar() { return star; } public void setStar(Star star) { this.star = star; } public Fans getFans() { return fans; } public void setFans(Fans fans) { this.fans = fans; } public Company getCompany() { return company; } public void setCompany(Company company) { this.company = company; } public void meeting() { System.out.println(star.getName() + "和粉丝：" + fans.getName() + "见面"); } public void business() { System.out.println(star.getName() + "和" + company.getName() + "进行洽谈"); } }Starpublic class Star { private String name; public Star(String name) { this.name = name; } public String getName() { return name; } }Fanspublic class Fans { private String name; public Fans(String name) { this.name = name; } public String getName() { return name; } }Companypublic class Company { private String name; public Company(String name) { this.name = name; } public String getName() { return name; } }Clientpublic class Client { public static void main(String[] args) { //经纪人 Agent agent = new Agent(); //明星 Star star = new Star("孙笑川"); agent.setStar(star); //粉丝 Fans fans = new Fans("药水哥"); agent.setFans(fans); //媒体公司 Company company = new Company("xxxTV"); agent.setCompany(company); //粉丝见面会 agent.meeting(); //商务洽谈 agent.business(); } }