項目二：客戶信息管理軟件

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package com.atguigu.p2;

import java.util.*;

/**
 * CMUtility工具類： 將不同的功能封裝爲方法，就是可以直接通過調用方法使用它的功能，而無需考慮具體的功能實現細節。
 */
public class CMUtility {
	private static Scanner scanner = new Scanner(System.in);

	/**
	 * 用於界面菜單的選擇。該方法讀取鍵盤，如果用戶鍵入’1’-’5’中的任意字符，則方法返回。返回值爲用戶鍵入字符。
	 */
	public static char readMenuSelection() {
		char c;
		for (;;) {
			String str = readKeyBoard(1, false);
			c = str.charAt(0);
			if (c != '1' && c != '2' && c != '3' && c != '4' && c != '5') {
				System.out.print("選擇錯誤，請重新輸入：");
			} else
				break;
		}
		return c;
	}

	/**
	 * 從鍵盤讀取一個字符，並將其作爲方法的返回值。
	 */
	public static char readChar() {
		String str = readKeyBoard(1, false);
		return str.charAt(0);
	}

	/**
	 * 從鍵盤讀取一個字符，並將其作爲方法的返回值。 如果用戶不輸入字符而直接回車，方法將以defaultValue 作爲返回值。
	 */
	public static char readChar(char defaultValue) {
		String str = readKeyBoard(1, true);
		return (str.length() == 0) ? defaultValue : str.charAt(0);
	}

	/**
	 * 從鍵盤讀取一個長度不超過2位的整數，並將其作爲方法的返回值。
	 */
	public static int readInt() {
		int n;
		for (;;) {
			String str = readKeyBoard(2, false);
			try {
				n = Integer.parseInt(str);
				break;
			} catch (NumberFormatException e) {
				System.out.print("數字輸入錯誤，請重新輸入：");
			}
		}
		return n;
	}

	/**
	 * 從鍵盤讀取一個長度不超過2位的整數，並將其作爲方法的返回值。 如果用戶不輸入字符而直接回車，方法將以defaultValue 作爲返回值。
	 */
	public static int readInt(int defaultValue) {
		int n;
		for (;;) {
			String str = readKeyBoard(2, true);
			if (str.equals("")) {
				return defaultValue;
			}

			try {
				n = Integer.parseInt(str);
				break;
			} catch (NumberFormatException e) {
				System.out.print("數字輸入錯誤，請重新輸入：");
			}
		}
		return n;
	}

	/**
	 * 從鍵盤讀取一個長度不超過limit的字符串，並將其作爲方法的返回值。
	 */
	public static String readString(int limit) {
		return readKeyBoard(limit, false);
	}

	/**
	 * 從鍵盤讀取一個長度不超過limit的字符串，並將其作爲方法的返回值。 如果用戶不輸入字符而直接回車，方法將以defaultValue 作爲返回值。
	 */
	public static String readString(int limit, String defaultValue) {
		String str = readKeyBoard(limit, true);
		return str.equals("") ? defaultValue : str;
	}

	/**
	 * 用於確認選擇的輸入。該方法從鍵盤讀取‘Y’或’N’，並將其作爲方法的返回值。
	 */
	public static char readConfirmSelection() {
		char c;
		for (;;) {
			String str = readKeyBoard(1, false).toUpperCase();
			c = str.charAt(0);
			if (c == 'Y' || c == 'N') {
				break;
			} else {
				System.out.print("選擇錯誤，請重新輸入：");
			}
		}
		return c;
	}

	private static String readKeyBoard(int limit, boolean blankReturn) {
		String line = "";

		while (scanner.hasNextLine()) {
			line = scanner.nextLine();
			if (line.length() == 0) {
				if (blankReturn)
					return line;
				else
					continue;
			}

			if (line.length() < 1 || line.length() > limit) {
				System.out.print("輸入長度（不大於" + limit + "）錯誤，請重新輸入：");
				continue;
			}
			break;
		}

		return line;
	}
}

package com.atguigu.p2;

public class Customer {
	private String name;
	private char gender;
	private int age;
	private String phone;
	private String email;

	public Customer(String name, char gender, int age) {
		this(name, gender, age, "", "");
	}

	public Customer(String name, char gender, int age, String phone, String email) {
		this.name = name;
		this.gender = gender;
		this.age = age;
		this.phone = phone;
		this.email = email;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public char getGender() {
		return gender;
	}

	public void setGender(char gender) {
		this.gender = gender;
	}

	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 String getEmail() {
		return email;
	}

	public void setEmail(String email) {
		this.email = email;
	}

	public String getDetails() {
		return name + "\t" + gender + "\t" + age + "\t\t" + phone + "\t" + email;
	}
}

package com.atguigu.p2;

public class CustomerList {
	private Customer[] customers;
	private int total = 0;

	public CustomerList(int totalCustomer) {
		customers = new Customer[totalCustomer];
	}

	public boolean addCustomer(Customer customer) {
		if (total >= customers.length)
			return false;

		customers[total++] = customer;
		return true;
	}

	public boolean replaceCustomer(int index, Customer cust) {
		if (index < 0 || index >= total)
			return false;

		customers[index] = cust;
		return true;
	}

	public boolean deleteCustomer(int index) {
		if (index < 0 || index >= total)
			return false;

		for (int i = index; i < total - 1; i++) {
			customers[i] = customers[i + 1];
		}

		customers[--total] = null;

		return true;
	}

	public Customer[] getAllCustomers() {
		Customer[] custs = new Customer[total];
		for (int i = 0; i < total; i++) {
			custs[i] = customers[i];
		}
		return custs;
	}

	public int getTotal() {
		return total;
	}

	public Customer getCustomer(int index) {
		if (index < 0 || index >= total)
			return null;

		return customers[index];
	}
}

package com.atguigu.p2;

public class CustomerView {
	private CustomerList customers = new CustomerList(10);

	public CustomerView() {
		Customer cust = new Customer("張三", '男', 30, "010-56253825", "[email protected]");
		customers.addCustomer(cust);
	}

	public void enterMainMenu() {
		boolean loopFlag = true;
		do {
			System.out.println("\n-----------------客戶信息管理軟件-----------------\n");
			System.out.println("                   1 添 加 客 戶");
			System.out.println("                   2 修 改 客 戶");
			System.out.println("                   3 刪 除 客 戶");
			System.out.println("                   4 客 戶 列 表");
			System.out.println("                   5 退       出\n");
			System.out.print("                   請選擇(1-5)：");

			char key = CMUtility.readMenuSelection();
			System.out.println();
			switch (key) {
			case '1':
				addNewCustomer();
				break;
			case '2':
				modifyCustomer();
				break;
			case '3':
				deleteCustomer();
				break;
			case '4':
				listAllCustomers();
				break;
			case '5':
				System.out.print("確認是否退出(Y/N)：");
				char yn = CMUtility.readConfirmSelection();
				if (yn == 'Y')
					loopFlag = false;
				break;
			}
		} while (loopFlag);
	}

	private void addNewCustomer() {
		System.out.println("---------------------添加客戶---------------------");
		System.out.print("姓名：");
		String name = CMUtility.readString(4);
		System.out.print("性別：");
		char gender = CMUtility.readChar();
		System.out.print("年齡：");
		int age = CMUtility.readInt();
		System.out.print("電話：");
		String phone = CMUtility.readString(15);
		System.out.print("郵箱：");
		String email = CMUtility.readString(15);

		Customer cust = new Customer(name, gender, age, phone, email);
		boolean flag = customers.addCustomer(cust);
		if (flag) {
			System.out.println("---------------------添加完成---------------------");
		} else {
			System.out.println("----------------記錄已滿,無法添加-----------------");
		}
	}

	private void modifyCustomer() {
		System.out.println("---------------------修改客戶---------------------");

		int index = 0;
		Customer cust = null;
		for (;;) {
			System.out.print("請選擇待修改客戶編號(-1退出)：");
			index = CMUtility.readInt();
			if (index == -1) {
				return;
			}

			cust = customers.getCustomer(index - 1);
			if (cust == null) {
				System.out.println("無法找到指定客戶！");
			} else
				break;
		}

		System.out.print("姓名(" + cust.getName() + ")：");
		String name = CMUtility.readString(4, cust.getName());

		System.out.print("性別(" + cust.getGender() + ")：");
		char gender = CMUtility.readChar(cust.getGender());

		System.out.print("年齡(" + cust.getAge() + ")：");
		int age = CMUtility.readInt(cust.getAge());

		System.out.print("電話(" + cust.getPhone() + ")：");
		String phone = CMUtility.readString(15, cust.getPhone());

		System.out.print("郵箱(" + cust.getEmail() + ")：");
		String email = CMUtility.readString(15, cust.getEmail());

		cust = new Customer(name, gender, age, phone, email);

		boolean flag = customers.replaceCustomer(index - 1, cust);
		if (flag) {
			System.out.println("---------------------修改完成---------------------");
		} else {
			System.out.println("----------無法找到指定客戶,修改失敗--------------");
		}
	}

	private void deleteCustomer() {
		System.out.println("---------------------刪除客戶---------------------");

		int index = 0;
		Customer cust = null;
		for (;;) {
			System.out.print("請選擇待刪除客戶編號(-1退出)：");
			index = CMUtility.readInt();
			if (index == -1) {
				return;
			}

			cust = customers.getCustomer(index - 1);
			if (cust == null) {
				System.out.println("無法找到指定客戶！");
			} else
				break;
		}

		System.out.print("確認是否刪除(Y/N)：");
		char yn = CMUtility.readConfirmSelection();
		if (yn == 'N')
			return;

		boolean flag = customers.deleteCustomer(index - 1);
		if (flag) {
			System.out.println("---------------------刪除完成---------------------");
		} else {
			System.out.println("----------無法找到指定客戶,刪除失敗--------------");
		}
	}

	private void listAllCustomers() {
		System.out.println("---------------------------客戶列表---------------------------");
		Customer[] custs = customers.getAllCustomers();
		if (custs.length == 0) {
			System.out.println("沒有客戶記錄！");
		} else {
			System.out.println("編號\t姓名\t性別\t年齡\t\t電話\t\t郵箱");
			for (int i = 0; i < custs.length; i++) {
//            System.out.println(i + 1 + "\t" + custs[i].getName() + "\t" + custs[i].getGender() + "\t" + custs[i].getAge() + "\t\t" + custs[i].getPhone() + "\t" + custs[i].getEmail());
				System.out.println((i + 1) + "\t" + custs[i].getDetails());
			}
		}

		System.out.println("-------------------------客戶列表完成-------------------------");
	}

	public static void main(String[] args) {
		CustomerView cView = new CustomerView();
		cView.enterMainMenu();
	}
}