UML中类之间的几种关系

 class Customer {
  private Integer id;
  private String name;

  private Set<Order> orders;

  public Set<Order> getOrders() {
   return orders;
  }

  public void setOrders(Set<Order> orders) {
   this.orders = orders;
  }

 }

 class Order {
  private Integer id;
  private float money;

  private Customer customer;

  public Customer getCustomer() {
   return customer;
  }

  public void setCustomer(Customer customer) {
   this.customer = customer;
  }

 }

 class Bicycle {
  public void expand(Pump pump) {
   pump.blow();
  }
 }

 class Pump {
  public void blow() {
   System.out.println("正在充气......");
  }
 }

 class Computer {
  private MainBoard mainBoard;
  private DisplayCard displayCard;
  
  public void on() {
   System.out.println("开启计算机......");
  }

  public void close() {
   System.out.println("关闭计算机......");
  }

  public void run() {
   System.out.println("计算机正在运行......");
  }
 }

 class MainBoard {
  public void control() {
   System.out.println("控制计算机......");
  }
 }

 class DisplayCard {
  public void display() {
   System.out.println("计算显示数据......");
  }
 }

 class People {
  private Head head;
  private Hand hand;
  private Leg leg;

  public void think() {
   head.think();
  }

  public void holdThing() {
   hand.holdThing();
  }

  public void walk() {
   leg.walk();
  }
 }

 class Head {
  public void think() {
   System.out.println("思考......");
  }
 }

 class Hand {
  public void holdThing() {
   System.out.println("拿东西......");
  }
 }

 class Leg {
  public void walk() {
   System.out.println("走路......");
  }
 }

 class People {
  protected String name;
  protected String sex;
  protected Date birthday;

  public void eat() {
   System.out.println(name + "正在吃饭......");
  }

  public void drink() {
   System.out.println(name + "正在喝水......");
  }

  public void sleep() {
   System.out.println(name + "正在休息......");
  }
 }

 class Student extends People {
  public void study() {
   System.out.println(name + "正在学习......");
  }
 }

public interface Driver {
 void drive();
}
 class CarDriver implements Driver {

  public void drive() {
   System.out.println("驾驶汽车......");
  }

 }

 class PlaneDriver implements Driver {

  public void drive() {
   System.out.println("驾驶飞机......");
  }

 }