Java作为一门广受欢迎的编程语言，其在各个领域都有着广泛的应用。为此，许多学校和培训机构都开设了Java课程，旨在培养从基础到高级的Java开发人才。在学习Java的过程中，课程设计是不可或缺的一环，它能够深入学生的思考和实践，帮助他们更好地掌握开发技能。

本文将介绍一些Java课程设计题目，并提供简单的代码实现，以供读者参考学习。

1. 统计字符出现次数

题目描述：输入一串字符串，统计每个字符出现的次数，并输出结果。

代码实现：

import java.util.*;
public class CharacterCount {
  public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
    System.out.print("请输入一个字符串：");
    String str = scanner.nextLine();
    char[] chars = str.toCharArray();
    HashMap
  map = new HashMap<>();
 
    for (char c : chars) {
      if (map.containsKey(c)) {
        map.put(c, map.get(c) + 1);
      } else {
        map.put(c, 1);
      }
    }
    for (Map.Entry
  entry : map.entrySet()) {
 
      System.out.println(entry.getKey() + "出现了" + entry.getValue() + "次");
    }
  }
}

2. 图书管理系统

题目描述：实现一个简单的图书管理系统，能够对图书的添加、删除、查询和借还进行管理。

代码实现：

import java.util.*;
public class BookManagement {
  private static ArrayList
  books = new ArrayList<>();
 
  private static Scanner scanner = new Scanner(System.in);
  public static void main(String[] args) {
    while (true) {
      System.out.println("欢迎使用图书管理系统！");
      System.out.println("1. 添加图书");
      System.out.println("2. 删除图书");
      System.out.println("3. 查询图书");
      System.out.println("4. 借出图书");
      System.out.println("5. 归还图书");
      System.out.println("6. 退出系统");
      System.out.print("请选择您需要的操作：");
      int choice = scanner.nextInt();
      switch (choice) {
        case 1:
          add();
          break;
        case 2:
          delete();
          break;
        case 3:
          search();
          break;
        case 4:
          borrow();
          break;
        case 5:
          returnBook();
          break;
        case 6:
          System.out.println("感谢使用图书管理系统！");
          System.exit(0);
        default:
          System.out.println("输入有误，请重新输入！");
      }
    }
  }
  private static void add() {
    scanner.nextLine();
    System.out.print("请输入图书名称：");
    String name = scanner.nextLine();
    System.out.print("请输入图书作者：");
    String author = scanner.nextLine();
    System.out.print("请输入图书分类：");
    String category = scanner.nextLine();
    books.add(new Book(name, author, category));
    System.out.println("图书添加成功！");
  }
  private static void delete() {
    scanner.nextLine();
    System.out.print("请输入要删除的图书名称：");
    String name = scanner.nextLine();
    for (int i = 0; i < books.size(); i++) {
      Book book = books.get(i);
      if (book.getName().equals(name)) {
        books.remove(i);
        System.out.println("图书删除成功！");
        return;
      }
    }
    System.out.println("未找到该图书！");
  }
  private static void search() {
    scanner.nextLine();
    System.out.print("请输入要查询的图书名称：");
    String name = scanner.nextLine();
    for (Book book : books) {
      if (book.getName().equals(name)) {
        System.out.println(book);
        return;
      }
    }
    System.out.println("未找到该图书！");
  }
  private static void borrow() {
    scanner.nextLine();
    System.out.print("请输入要借出的图书名称：");
    String name = scanner.nextLine();
    for (Book book : books) {
      if (book.getName().equals(name)) {
        if (book.isBorrowed()) {
          System.out.println("该图书已被借出！");
        } else {
          book.setBorrowed(true);
          System.out.println("借书成功！");
        }
        return;
      }
    }
    System.out.println("未找到该图书！");
  }
  private static void returnBook() {
    scanner.nextLine();
    System.out.print("请输入要归还的图书名称：");
    String name = scanner.nextLine();
    for (Book book : books) {
      if (book.getName().equals(name)) {
        if (book.isBorrowed()) {
          book.setBorrowed(false);
          System.out.println("还书成功！");
        } else {
          System.out.println("该图书未被借出，无法归还！");
        }
        return;
      }
    }
    System.out.println("未找到该图书！");
  }
}
class Book {
  private String name;
  private String author;
  private String category;
  private boolean borrowed;
  public Book(String name, String author, String category)
    this.name = name;
    this.author = author;
    this.category = category;
  
  public String getName()
    return name;
  
  public String getAuthor()
    return author;
  
  public String getCategory()
    return category;
  
  public boolean isBorrowed()
    return borrowed;
  
  public void setBorrowed(boolean borrowed)
    this.borrowed = borrowed;
  
  public String toString() {
    return "图书名称：" + name + "，作者：" + author + "，分类：" + category + "，是否借出：" + (borrowed ? "是" : "否");
  }
}

3. 简单计算器

题目描述：实现一个简单的计算器，能够进行加减乘除四则运算。

代码实现：

import java.util.Scanner;
public class Calculator {
  public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
    System.out.print("请输入第一个数字：");
    double num1 = scanner.nextDouble();
    System.out.print("请输入运算符（+、-、*、/）：");
    String operator = scanner.next();
    System.out.print("请输入第二个数字：");
    double num2 = scanner.nextDouble();
    double result;
    switch (operator) {
      case "+":
        result = num1 + num2;
        break;
      case "-":
        result = num1 - num2;
        break;
      case "*":
        result = num1 * num2;
        break;
      case "/":
        result = num1 / num2;
        break;
      default:
        System.out.println("输入有误，程序结束！");
        return;
    }
    System.out.println(num1 + " " + operator + " " + num2 + " = " + result);
  }
}

相似文章
• javaee云借阅图书管理系统：数字时代
  javaee云借阅图书管理系统：数字时代
  
  

友情链接
• 网站定制开发
• 帮你发
• 小蓄群站获客
• 雅圣洁家政