Java面向对象类关联结构（）关系

布满荆棘的人生 2023-01-05 15:28 201阅读 0赞

*  一对一 person car
 *  一对多 person children （自身关联）

先写基本 关系后加

package com.msc.example;
    class Car{ 
        private String cname ;
        private double price ;
        private Person person;
        public Car() { } ;
        public Car(String cname,double price){ 
            this.cname = cname ;
            this.price = price ;
        }
        public void setPerson(Person person){ 
              this.person = person ;
        }
        public Person getPerson(){ 
            return this.person ;
        }
        public void setCname(String cname){ 
            this.cname = cname ;
        }
        public void setPrice(double price){ 
            this.price = price ;
        }
        public String getCname(){ 
            return this.cname ;
        }
        public double getPrice(){ 
            return this.price ;
        }
        public String getInfo(){ 
            return "【汽车信息】名字 = "+this.cname+" 价格 = "+ this.price ;
        }
    }
    class Person{ 
        private String pname ;
        private int age ;
        private Car car ;
        private Person children[] ;
        public Person() { };
        public Person(String pname,int age) { 
            this.pname = pname ;
            this.age = age ;
        };
        public void setChildren(Person[] children) { 
            this.children = children;
        }
        public Person[] getChildren() { 
            return this.children;
        }
    
        public void setCar(Car car) { 
            this.car = car;
        }
    
        public Car getCar() { 
            return this.car;
        }
    
        public void setPname(String pname) { 
            this.pname = pname;
        }
    
        public void setAge(int age) { 
            this.age = age;
        }
    
        public int getAge() { 
            return this.age;
        }
    
        public String getPname() { 
            return this.pname;
        }
        public String getInfo(){ 
            return "【个人信息】 姓名 = "+this.pname+" 年龄 = "+this.age ;
        }
    }
    
    
    public class JavaBegin { 
        public static void main(String args[]){ 
           // 第一步声明对象并设置彼此的关系
           Person father = new Person("张三",45) ;
           Person mother = new Person("王五",46) ;
           Person son = new Person("小刘",45) ;
           Person daugher = new Person("小莉",45) ;
           Car carA = new Car("法拉利",100000) ;
           Car carB = new Car("兰博基尼",600000) ;
           Car carC = new Car("奥迪",15640) ;
           Car carD = new Car("奔驰",200) ;
           father.setCar(carA);
           carA.setPerson(father);
           mother.setCar(carB);
           carB.setPerson(mother);
           son.setCar(carC);
           carA.setPerson(son);
           daugher.setCar(carD);
           carD.setPerson(daugher);
           father.setChildren(new Person[]{ son,daugher}) ;
           mother.setChildren(new Person[]{ son,daugher}) ;
           // 第二步根据关系获取数据
           System.out.println(father.getInfo()+" and "+father.getCar().getInfo()); //人找车
           System.out.println(carB.getInfo()+" and "+carB.getPerson().getInfo());  //车找人
           for(Person temp : father.getChildren()){ 
                System.out.println(temp.getInfo());
            }
           for(int x = 0 ;x<mother.getChildren().length;x++){ 
                System.out.println(mother.getChildren()[x].getInfo());
            }
        }
    }

**输出：**  
![在这里插入图片描述][20210113115135448.png]

[20210113115135448.png]: /images/20221119/3f0e314117c44977984dc7309551ed0f.png