Java小程序------电话本管理系统（数组）

使用Java写一个电话本管理系统，利用数组，将输入的联系人信息封装到对象中，再将对象存入数组。
实现添加，删除，修改，查询数组中所有联系人，按名字查询，退出等功能。下面是代码

1.首先建立一个PhoneBook类

public class PhoneBook {
	private String name;
	private char sex;
	private int age;
	private String phone;
	private long qq;
	private String address;
	public PhoneBook(String name,char sex,int age,String phone,long qq,String address) {
		this.name = name;
		this.sex = sex;
		this.age = age;
		this.phone = phone;
		this.qq = qq;
		this.address = address;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public char getSex() {
		return sex;
	}
	public void setSex(char sex) {
		this.sex = sex;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public String getPhone() {
		return phone;
	}
	public void setPhone(String phone) {
		this.phone = phone;
	}
	public long getQq() {
		return qq;
	}
	public void setQq(long qq) {
		this.qq = qq;
	}
	public String getAddress() {
		return address;
	}
	public void setAddress(String address) {
		this.address = address;
	}
	@Override//用字符串表示
	public String toString() {
		return "姓名：" + name + ", 性别：" + sex + ", 年龄：" + age + ", 电话：" + phone + ", QQ：" + qq
				+ ", 地址：" + address;
	}

}

2.方法

import java.util.Scanner;
public class Methods {
	PhoneBook[] pb = new PhoneBook[100];
	//PhoneBook数组用来存放联系人信息
	int num = 0;//索引
	Scanner sc = new Scanner(System.in);
	//添加联系人
	public void add() {
		System.out.println("----------添加电话本----------");
		System.out.print("姓名：");
		String name = sc.nextLine();
		System.out.print("性别：");
		char sex = sc.next().charAt(0);
		System.out.print("年龄：");
		int age = sc.nextInt();
		sc.nextLine();
		System.out.print("电话：");
		String phone = sc.nextLine();
		System.out.print("QQ：");
		long qq = sc.nextLong();
		sc.nextLine();
		System.out.print("地址：");
		String address = sc.nextLine();
		PhoneBook phoneBook = new PhoneBook(name, sex, age, phone, qq, address);//新建一个对象
		pb[num++] = phoneBook;//将对象存入数组
		System.out.println(phoneBook.toString());//输出对象元素
		System.out.println("添加成功！");
		System.out.println("**************************************");//分割线
	}
	//修改联系人
	public void update() {
		boolean flag = false;//初始化flag，用于判断是否有此人
		System.out.println("----------修改电话本----------");
		System.out.println("请输入要修改的姓名：");
		String name1 = sc.nextLine();
		for (int i = 0; i < num; i++) {
			if (name1.equals(pb[i].getName())) {
				flag = true;
				System.out.println(pb[i].toString());
				System.out.println("请重新输入信息");
				System.out.print("姓名：");
				String name = sc.nextLine();
				System.out.print("性别：");
				char sex = sc.next().charAt(0);
				System.out.print("年龄：");
				int age = sc.nextInt();
				sc.nextLine();
				System.out.print("电话：");
				String phone = sc.nextLine();
				System.out.print("QQ：");
				long qq = sc.nextLong();
				sc.nextLine();
				System.out.print("地址：");
				String address = sc.nextLine();
				PhoneBook phoneBook = new PhoneBook(name, sex, age, phone, qq, address);//新建一个对象
				pb[i] = phoneBook;
				System.out.println(phoneBook.toString());
				System.out.println("修改成功");
				System.out.println("**************************************");//分割线	
				break;
			} 
			if (flag == false) {
				System.out.println("无信息");
				System.out.println("**************************************");//分割线
			}
		}
		
	}
	//打印所有电话本
	public void selectAll() {
		System.out.println("----------打印所有电话本----------");
		if (num == 0) {
			System.out.println("电话本中无信息");
			System.out.println("**************************************");

		} else {
			for (int i = 0; i < num; i++) {
				System.out.println(pb[i].toString());
				System.out.println("**************************************");

			}
		}
	}
	//删除联系人
	public void del() {
		boolean flag = false;
		System.out.println("----------删除电话本----------");
		System.out.println("请输入要删除的姓名");
		String name1 = sc.nextLine();
		for (int i = 0; i < num; i++) {
			if (name1.equals(pb[i].getName())) {
				flag = true;
				System.out.println("确认要删除吗？1（是）0（否）");
				int n = sc.nextInt();
				if (n == 1) {
					for (int j = i; j < num - 1; j++) {
						if (j == num - 1) {
							pb[j] = null;
						} else {
							pb[j] = pb[j + 1];
						}
					}
				num--;
				System.out.println("删除成功");
				System.out.println("**************************************");
				}
			} 
			if (flag == false) {
					System.out.println("无信息");
					System.out.println("**************************************");
				}
		}
	}
	//根据姓名查询
	public void selectName() {
		boolean flag = false;
		System.out.println("----------根据姓名查询----------");
		System.out.println("请输入要查询的姓名：");
		String name1 = sc.nextLine();
		for (int i = 0; i < num; i++) {
			if (name1.equals(pb[i].getName())) {
				flag = true;
				System.out.println(pb[i].toString());
				System.out.println("**************************************");
			} 
		}
			if (flag == false) {
				System.out.println("查无此人");
				System.out.println("**************************************");
			}
	}
	//退出系统
	public void exit() {
		System.out.println("退出系统");
	}
}

3.主函数，实现功能

import java.util.Scanner;
public class Phone {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		Methods ms = new Methods();
		while(true){
			System.out.println("----------电话本管理系统----------");
			System.out.println("1.添加   2.删除   3.修改   4.查询所有   5.根据姓名查询   0.退出");
			System.out.println("----------电话本管理系统----------");
			//输入序号，实现对应的功能
			System.out.println("请选择业务：");
			int n = sc.nextInt();
		    if (n == 1) {
				ms.add();
			}else if (n == 2) {
				ms.del();
			}else if (n == 3) {
				ms.update();
			}else if (n == 4) {
				ms.selectAll();
			}else if (n == 5) {
				ms.selectName();
			}else {
				ms.exit();
				break;
			}
		}
	}
}

运行结果