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【热门框架】Maven分模块开发是什么意思?怎样操作?

小云晓云 2023-05-03 阅读 51

 

目录

逻辑实现:

第一步:登录界面

第二步:菜单的实现

第三步:增,删,查,显示等操作方法的实现和调用

 方法实现:


 

逻辑实现:

第一步:登录界面

登录方法:landing

package User;

import java.util.Scanner;

import Library.Booklist;

public class Main {
	public static User landing() {//登录界面的方法
		System.out.println("请输入你的名字:>");
		Scanner scanner = new Scanner(System.in);
		String name = scanner.nextLine();	
		System.out.println("请选择:0->普通用户,1——>管理员");
		int choice = scanner.nextInt();
		if(choice == 0 ) {
			return new NormalUser(name);
		}
		else {
			return new AdminUser(name);}
	}

	public static void main(String[] args) {
	Booklist booklist = new Booklist();//准备数据
	User user = landing();//用来选择登录那个界面的

	}

}

第二步:菜单的实现

一步一步来,先加个菜单: 

代码:

package User;


public abstract class User {
 
  protected String name;
  public User(String name) {
	// TODO Auto-generated constructor stub
	  this.name = name;
}
  public  abstract int menu();
	
	
}

 好了,解释完毕!现在来看看menu()方法的具体实现:

AdminUser中:

package User;

import java.util.Scanner;



public class AdminUser extends User{
	public AdminUser(String name) {
		// TODO Auto-generated constructor stub
		super(name);//先帮父类构造
		this.name = name;//再自己构造
	}
	public int menu() {
		System.out.println("欢迎 "+name+"来到图书管理系统");
		System.out.println("*******************************");
		System.out.println("0.退出系统");
		System.out.println("1.添加图书");
		System.out.println("2.移除图书");
		System.out.println("3.查找图书");
		System.out.println("4.显示图书");
		System.out.println("*******************************");
		System.out.println("请选择你的操作");
		Scanner scanner = new Scanner(System.in);
		int choice = scanner.nextInt();
		return choice;
	}

}

NormalUser类中:

package User;

import java.util.Scanner;

public class NormalUser extends User{
	public NormalUser(String name) {
		// TODO Auto-generated constructor stub
		super(name);
		this.name = name;
	}
	public int menu() {
		System.out.println("欢迎 "+name+"来到图书管理系统");
		System.out.println("*******************************");
		System.out.println("0.退出系统");
		System.out.println("1.借阅图书");
		System.out.println("2.归还图书");
		System.out.println("3.查找图书");
		System.out.println("4.显示图书");
		System.out.println("请选择你的操作");
		Scanner scanner = new Scanner(System.in);
		int choice = scanner.nextInt();
		return choice;
	}
	
}

第三步:增,删,查,显示等操作方法的实现和调用

思路:

 第一步:User(父类)中

第二步:在AdminUser(子类)中

 第三步:在NormalUser(子类)中

 

调用:

调用方法:doOperation

代码:

public void doOperation(int choice,Booklist booklist) {
		ioperations[choice].work(booklist);//利用之前定义的接口数组来访问各种操作方法
		
	}

 方法实现:

1.AddOperation

代码:

package Operation;

import java.util.Scanner;

import Library.Booklist;

public class AddOperation implements IOperation{
	public void work(Booklist booklist) {//重写方法,使这个方法变为Addoperation的方法
		System.out.println("添加图书!");
		Scanner scanner  = new Scanner(System.in);
		System.out.println("请输入你要添加的图书的名字:>");
		String name = scanner.nextLine();
		System.out.println("请输入你要添加的图书的类型:>");
		String type = scanner.nextLine();
		System.out.println("请输入你要添加的图书的作者:>");
		String author = scanner.nextLine();
		System.out.println("请输入你要添加的图书的价格:>");
		int price = scanner.nextInt();	
		System.out.println("添加成功!");
	}


}

2.DisplayOperation

代码:

package Operation;

import Library.Book;
import Library.Booklist;

public class DisplayOperation implements IOperation {
public void work(Booklist booklist) {
	System.out.println("显示图书!");
	int curSize = booklist.getSize();
	
	for(int i = 0;i<curSize;i++) {
		Book book = booklist.getPos(i);
		System.out.println(book);
	}
}
}

当然,这个代码要实现就要在原来的代码中添加一些细节的东西,三处细节:

 3.DelOperation

package Operation;

import java.util.Scanner;

import Library.Book;
import Library.Booklist;

public class DelOperation implements IOperation {
	public void work(Booklist booklist) {//重写方法,使work方法变成DelOperation的方法
		Scanner scanner = new Scanner(System.in);
		System.out.println("删除图书!");
		System.out.println("请输入你要删除的图书的名字:>");
		String name = scanner.nextLine();
		int curSize = booklist.getSize();
		int index = -1;
		for(int i = 0;i<curSize;i++) {
			Book book = booklist.getPos(i);
			if(name.equals(book.getName())) {
				index = i;
				break;
			
			}
		}
		if(index == -1) {
			System.out.println("没有你要删除的书!");
		}
		else {
			for(int i = index;i<curSize-1;i++) {
				Book book = booklist.getPos(i+1);
				booklist.setBooks(book, i);
			
			}
			booklist.setSize(curSize-1);
			booklist.setBooks(null, curSize);
			System.out.println("删除成功!");
		}
		
		
	}

}

4.其它方法

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