Java面向对象编程 -7.2

自身关联

class Car{
	private float value;
	private String name;
	private Person person;
	public void setName(String name){
		this.name = name;
	}
	public String getName(){
		return this.name;
	}
	public void setValue(float value){
		this.value = value;
	}
	public float getValue(){
		return this.value;
	}
	public void setPerson(Person person){
		this.person = person;
	}
	public Person getPerson(){
		return this.person;
	}
	public String getInfo(){
		return "name"+name+"value"+value;
	}
	public Car(String name,float value){
		this.name = name;
		this.value = value;
	}
}


class Person{
	private String name;
	private int age;
	private Car car;
	private Person children[];//一个人可以有很多孩子 这些孩子都是人 都有相同的类结构 不可能重复建多个类
	
	public void setChildren(Person children[]){//注意 我第一次想的不对
		this.children = children;
	}
	public Person[] getChildren(){//注意 我第一次想的不对
		return this.children;
	}
	public void setName(String name){
		this.name= name;
	}
	public String getName(){
		return this.name;
	}
	public void setAge(int age){
		this.age = age;
	}
	public int getAge(){
		return this.age;
	}
	public void setCar(Car car){
		this.car = car;
	}
	public Car getCar(){
		return this.car;
	}
	public String getInfo(){
		return "name"+name+"age"+age;
	}
	public Person(String name,int age){
		this.name = name;
		this.age = age;
	}
}


public class name {	
	public static void main(String args[]){
		Person person = new Person("张三",18);
		Car car = new Car("宾利", 20000000.00f);
		Person childA = new Person("李四", 1);
		Person childB = new Person("王五", 2);
		childA.setCar(new Car("BWM X1", 300000.00f));//匿名函数
		childB.setCar(new Car("法拉利", 200000.00f));//匿名函数
		person.setChildren(new Person[]{childA,childB});//这里我没想到这样写
		person.setCar(car);
		car.setPerson(person);
		System.out.println(person.getCar().getInfo());//代码链
		System.out.println(car.getPerson().getInfo());//代码链
		for (int i = 0; i < person.getChildren().length; i++) {
			System.out.println(person.getChildren()[i].getInfo());
			System.out.println(person.getChildren()[i].getCar().getInfo());
			
		}
	}
}

这些关系的匹配都是通过引用数据类型的关联来完成的
对象数组能表示多 这个概念 在实际开发中异常重要