首先：确定代码雏形框架（原始代码）

先根据以往经验写出一般的电话簿管理系统，先把代码雏形框架确定好。

原始代码运行结果：

原始代码源码：

package bidirectionalDome;

import java.util.ArrayList;

public class BidirectionalDome {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Contact Contact1 = new Contact(007,"幸存者letp",true);
		Phone Phone1 = new Phone(11,"home",Contact1);
		Phone Phone2 = new Phone(12,"person",Contact1);
		Phone Phone3 = new Phone(13,"company",Contact1);
		
		ArrayList<Phone> phones = Contact1.getPhoneArray();//获取电话簿
		String pername = Contact1.getName();
		for(int i = 0;i<phones.size();i++) {
			System.out.println(phones.get(i).getPhoneNom()+phones.get(i).getType());
		}
		System.out.println("电话号码主人为："+Contact1.getName());
		
		
	}

}
class Contact{
	private int contectID;
	private String name;
	private boolean isFroqContect;
	private ArrayList<Phone> phoneArray;//实现多对一
	
	//带参构造
	public Contact(int contectID,String name,boolean isFroqContect) {
		this.contectID = contectID;
		this.name = name;
		this.isFroqContect = isFroqContect;
		
		//定义一个电话簿数组—大小为3
		phoneArray = new ArrayList<Phone>(3);
	}
	//标准方法
	public ArrayList<Phone> getPhoneArray() {
		return phoneArray;
	}

	public void setPhoneArray(ArrayList<Phone> phoneArray) {
		this.phoneArray = phoneArray;
	}
	
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	//将电话号码添加到phoneArray数组中——实现contact与电话号码一对多形式
	public void addPhoneToContact(Phone aPhone) {
		phoneArray.add(aPhone);
	}
}
class Phone{
	private int phoneNom;
	private String type;
	private Contact aContact;//实现一对一
	
	//带参构造
	public Phone(int phoneNom,String type,Contact aContact){
		this.phoneNom = phoneNom;
		this.type = type;
		this.aContact = aContact;
		aContact.addPhoneToContact(this);
	}
	//标准方法
	public int getPhoneNom() {
		return phoneNom;
	}

	public void setPhoneNom(int phoneNom) {
		this.phoneNom = phoneNom;
	}

	public String getType() {
		return type;
	}

	public void setType(String type) {
		this.type = type;
	}
}

其次：按题目要求进行修改（终极代码）

【问题描述】编程实现如图所示的类间关联关系（双向关联）

【输入形式】

输入分4行，

第1行：联系人ID 联系人姓名

第2行：第一个联系电话号码 联系电话类型

第3行：第二个联系电话号码 联系电话类型

第4行：第三个联系电话号码 联系电话类型
【输出形式】

见样例输出
【样例输入】

123 xiaoyu

87542222 office

87558755 home

1397890678 mobile

【样例输出】

ContactName:xiaoyu PhoneNumber:87542222 type:office

ContactName:xiaoyu PhoneNumber:87558755 type:home

ContactName:xiaoyu PhoneNumber:1397890678 type:mobile

Contact of the second phone:xiaoyu

终极代码运行结果：

终极代码源码：

package bidirectionalDome;

import java.util.ArrayList;
import java.util.Scanner;

public class BidirectionalDome {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner in = new Scanner(System.in);
		//输入电话主人基本信息
		int ID = in.nextInt();
		String name = in.next();
		boolean isFroq = in.hasNext();
		
		Contact aContact = new Contact(ID,name,isFroq);
		//输入电话号码
		for(int i = 0;i<3;i++) {
			String phoneNom = in.next();
			String type = in.next();
			new Phone(phoneNom,type,aContact);//用到类间关联
			//Phone aPhone = new Phone(phoneNom,type,aContact);
			//aContact.addPhoneToContact(aPhone);
		}
		
		ArrayList<Phone> phones = aContact.getPhoneArray();//获取电话簿
		String pername = aContact.getName();
		for(int i = 0;i<phones.size();i++) {
			System.out.println("ContactName:"+pername+" PhoneNumber:"+phones.get(i).getPhoneNom()+" type:"+phones.get(i).getType());
		}
		System.out.println("Contact of the second phone:"+pername);
		//System.out.println(aContact.isFroqContect());//验证isFroqContect()默认值为true
	}

}
class Contact{
	private int contectID;
	private String name;
	private boolean isFroqContect;//默认为true
	private ArrayList<Phone> phoneArray;//实现多对一
	
	//带参构造
	public Contact(int contectID,String name,boolean isFroqContect) {
		this.contectID = contectID;
		this.name = name;
		this.isFroqContect = isFroqContect;
		
		//定义一个电话簿数组—大小为3
		phoneArray = new ArrayList<Phone>(3);
	}
	//标准方法
	public ArrayList<Phone> getPhoneArray() {
		return phoneArray;
	}

	public void setPhoneArray(ArrayList<Phone> phoneArray) {
		this.phoneArray = phoneArray;
	}
	
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	
	public boolean isFroqContect() {
		return isFroqContect;
	}
	public void setFroqContect(boolean isFroqContect) {
		this.isFroqContect = isFroqContect;
	}
	//将电话号码添加到phoneArray数组中——实现contact与电话号码一对多形式
	public void addPhoneToContact(Phone aPhone) {
		phoneArray.add(aPhone);
	}
}
class Phone{
	private String phoneNom;
	private String type;
	private Contact aContact;//实现一对一
	
	//带参构造
	public Phone(String phoneNom,String type,Contact aContact){
		this.phoneNom = phoneNom;
		this.type = type;
		this.aContact = aContact;
		aContact.addPhoneToContact(this); //实现一对多——作用等同于void addPhoneToContact(Phone aPhone)
	}
	//标准方法
	public String getPhoneNom() {
		return phoneNom;
	}

	public void setPhoneNom(String phoneNom) {
		this.phoneNom = phoneNom;
	}

	public String getType() {
		return type;
	}

	public void setType(String type) {
		this.type = type;
	}
	public Contact getaContact() {
		return aContact;
	}
	public void setaContact(Contact aContact) {
		this.aContact = aContact;
	}
}

END：放眼远方，聚焦当下。