Java面向对象

#Java面向对象 | 来源: 网络整理| 查看: 265

Java图书管理系统类图如下：在这里插入图片描述具体用户操作再Test测试类中实现

以下为具体代码： Person类：

package com.test2; public abstract class Person { private String name; private int age; private String sex; public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { if (age this.age = age; } } public String getSex() { return sex; } public void setSex(String sex) { if (sex.equals("1")) { this.sex = "男"; } else { this.sex = "女"; } } }

User类

package com.test2; import java.util.Scanner; /** * 用户类 * */ public class User extends Person{ OrderForm order; Scanner sca = new Scanner(System.in); /** * 修改信息 */ public void modifiy() { if (this.getName() != null) { System.out.println("请输入您的昵称："); String oldName = sca.next(); System.out.println("请输入您的年龄："); int age = sca.nextInt(); System.out.println("请输入您的性别："); String sex = sca.next(); if (oldName.equals(this.getName()) && age == this.getAge() && sex.equals(this.getSex())) { System.out.println("匹配成功，请输入您修改后的昵称："); this.setName(sca.next()); System.out.println("请输入年龄："); this.setAge(sca.nextInt()); System.out.println("请选择性别：1.男\t2.女"); this.setSex(sca.next()); System.out.println("修改成功~"); } else { System.out.println("您输入的与旧用户信息不匹配，修改失败！"); } } else { System.out.println("您没有任何信息！"); } } /** * 结算订单 * 将借书日期和归还日期计算出相差多少天，就是借了多少天，天数*一天的价格=总价 */ public void balance() { if (order.books[0] != null) { int count = 0; System.out.println("订单序号\t书籍名称\t借出价格/天\t书籍原价\t借出天数\t总价"); for (int i = 0; i if (order.states[i] == 1) { count++; System.out.print((i + 1) + "\t"); order.books[i].check(); System.out.println("\t" + order.day[i] + "\t" + order.sumMoney[i]); } } } if (count != 0) { System.out.println("请输入要结算的订单序号："); int index = sca.nextInt(); System.out.println("请支付：" + order.sumMoney[index - 1] + "元"); double pay = 0.00; do { pay = sca.nextDouble(); if (pay > order.sumMoney[index - 1]) { System.out.println("支付成功，找您：" + (pay - order.sumMoney[index - 1]) + "元"); } else if (pay System.out.println("支付成功~"); } } while((pay System.out.println("您无订单信息！"); } } /** * 计算借书日期至归还日期的天数 * @param outYear 借书年份 * @param outMonth 借书月份 * @param outDate 借书日期 * @param backYear 归还年份 * @param backMonth 归还月份 * @param backDate 归还日期 * @return 天数 */ public int calcDate(int outYear, int outMonth, int outDate, int backYear, int backMonth, int backDate) { //计算开始年份至结束年份的天数 int outYearDays = 0; for (int i = outYear; i outYearDays += 366; } else { outYearDays += 365; } } //计算开始年份的月份天数 int outMonthDays = 0; for (int i = 1; i outMonthDays += 31; } else if (i == 4 || i == 6 || i == 9 || i == 11) { outMonthDays += 30; } else { if ((outYear % 4 == 0 && outYear % 100 != 0) || outYear % 400 == 0) { outMonthDays += 29; } else { outMonthDays += 28; } } } //计算结束年份的月份的天数 int backMonthDays = 0; for (int i = 1; i backMonthDays += 31; } else if (i == 4 || i == 6 || i == 9 || i == 11) { backMonthDays += 30; } else { if ((backYear % 4 == 0 && backYear % 100 != 0) || backYear % 400 == 0) { backMonthDays += 29; } else { backMonthDays += 28; } } } //计算天数差 int result = outYearDays - (outMonthDays + outDate) + (backMonthDays + backDate); return result; } /** * 删除订单 */ public void delete() { get(); if (order.books[0] != null) { System.out.println("请输入要删除的订单序号："); int index = sca.nextInt(); if (index order.books.length) { System.out.println("订单不存在！"); } else { if (order.states[index - 1] == 1 && order.isBuy[index - 1] == 1) { order.books[index - 1] = null; for (int j = index - 1; j System.out.println("订单未签收或未结算！"); } } } } /** * 还书 */ public void returnBook() { get(); if (order.books[0] != null) { System.out.println("请输入要签收的订单序号："); int index = sca.nextInt(); if (index order.books.length) { System.out.println("订单不存在！"); } else { if (order.states[index - 1] == 0) { order.states[index - 1] = 1; System.out.println("请输入今天的日期："); for (int i = 0; i System.out.println("请输入年份："); order.backYear[i] = sca.nextInt(); System.out.println("请输入月份："); order.backMonth[i] = sca.nextInt(); System.out.println("请输入日期："); order.backDate[i] = sca.nextInt(); order.day[i] = calcDate(order.outYear[index - 1], order.outMonth[index - 1], order.outDate[index - 1], order.backYear[index - 1], order.backMonth[index - 1], order.backDate[index - 1]); order.sumMoney[i] = order.day[i] * Book.booksDayPrice[i]; System.out.println("日期相差" + order.day[i] + "天,一天借出价格：" + Book.booksDayPrice[i] + ",总价：" + order.sumMoney[i]); break; } } System.out.println("签收成功~"); } else { System.out.println("订单已签收，无需重复签收！"); } } } } /** * 查看订单 */ public void get() { int count = 0; if (order.books[0] != null) { System.out.println("姓名：" + this.getName() + "\n年龄：" + this.getAge() + "\n性别：" + this.getSex()); System.out.println("书籍序号\t书籍名称\t借出价格\t书籍原价\t借出书本的日期\t当前状态\t是否结算\t归还书本的日期"); } for (int i = 0; i System.out.print(" " + (i + 1) + "\t"); order.books[i].check(); String state = order.states[i] == 0 ? "未归还" : "已归还"; String isBuy = order.isBuy[i] == 0 ? "未结算" : "已结算"; System.out.print("\t" + order.outYear[i] + "/" + order.outMonth[i] + "/" + order.outDate[i] + "\t " + state + "\t " + isBuy); if (state.equals("已归还")) { System.out.println("\t" + order.backYear[i] + "/" + order.backMonth[i] + "/" + order.backDate[i]); } else { System.out.println(); } count++; } } if (count == 0) { System.out.println("您没有任何订单记录！"); } } /** * 借书 */ public void giveBook(OrderForm order) { if (this.getName() == null) { System.out.println("请输入您的姓名："); this.setName(sca.next()); } if (this.getAge() == 0) { System.out.println("请输入您的年龄："); this.setAge(sca.nextInt()); } if (this.getSex() == null) { System.out.println("请输入您的性别：\n" + "1.男\t2.女"); this.setSex(sca.next()); } if (order.books[order.books.length - 1] != null) { System.out.println("存储空间已满，无法存储！"); } else { Book book = new Book(); book.show(); System.out.println("请选择要借的书籍序号："); book.add(sca.nextInt()); System.out.println("请输入今天的日期："); for (int i = 0; i System.out.println("请输入年份："); order.outYear[i] = sca.nextInt(); System.out.println("请输入月份："); order.outMonth[i] = sca.nextInt(); System.out.println("请输入日期："); order.outDate[i] = sca.nextInt(); break; } } for (int i = 0; i order.books[i] = book; System.out.println("借书成功~"); break; } } } } }

Book类

package com.test2; /** * 书本类 * */ public class Book { String[] booksName = {"物理", "化学", "数学", null, null}; static double[] booksDayPrice = {1.3, 1.2, 1.5, 0.0, 0.0}; double[] booksPrice = {30.0, 40.0, 35.0, 0.0, 0.0}; private String[] choiceName = new String[booksName.length]; private double[] choiceDayPrice = new double[booksDayPrice.length]; private double[] choicePrice = new double[booksPrice.length]; /** * 输出书籍信息 */ public void show() { System.out.println("书籍序号\t书籍名称\t借出价格/天\t书籍原价"); for (int i = 0; i System.out.println((i + 1) + "\t" + booksName[i] + "\t" + booksDayPrice[i] + "\t" + booksPrice[i]); } } } public void add(int index) { for (int i = 0; i choiceName[i] = booksName[index - 1]; choiceDayPrice[i] = booksDayPrice[index - 1]; choicePrice[i] = booksPrice[index - 1]; break; } } } public void check() { for (int i = 0; i System.out.print("《" + choiceName[i] + "》\t￥" + choiceDayPrice[i] + "\t￥" + choicePrice[i]); } } } }

OrderForm类

package com.test2; /** * 订单类 * */ public class OrderForm { //借书日期 int[] outYear = new int[3]; int[] outMonth = new int[3]; int[] outDate = new int[3]; //归还日期 int[] backYear = new int[3]; int[] backMonth = new int[3]; int[] backDate = new int[3]; Book[] books = new Book[3];//书籍最大存储 int[] states = new int[3];//当前书籍状态 int[] isBuy = new int[3];//当前书籍是否结算 int[] day = new int[3];//相差的天数 double[] sumMoney = new double[3];//总价 }

Test测试类

package com.test2; import java.text.DecimalFormat; import java.util.Scanner; /** * 测试类 * */ public class Test { public static void main(String[] args) { //初始化工具 Scanner sca = new Scanner(System.in); DecimalFormat df = new DecimalFormat("####0.00"); System.out.println("欢迎来到图书科技管理系统"); User user = new User(); user.order = new OrderForm(); boolean isExit = false; do { System.out.println("*****************\n" + "1.我要借书\n" + "2.查看订单\n" + "3.归还书籍\n" + "4.删除订单\n" + "5.结算订单\n" + "6.修改信息\n" + "7.退出系统\n" + "*****************\n" + "请根据编号进行输入："); switch (sca.next()) { case "1": System.out.println("***我要借书***"); user.giveBook(user.order); break; case "2": System.out.println("***查看订单***"); user.get(); break; case "3": System.out.println("***归还书籍***"); user.returnBook(); break; case "4": System.out.println("***删除订单***"); user.delete(); break; case "5": System.out.println("***结算订单***"); user.balance(); break; case "6": System.out.println("***修改信息***"); user.modifiy(); break; case "7": System.out.println("确定退出吗？1：退出 0：继续"); if (sca.next().equals("1")) { isExit = true; } break; default : System.out.println("您的输入有误，请您重新输入："); } } while(!isExit); if (isExit) { System.out.println("感谢使用，再见！"); } sca.close(); } }

直接复制就能运行~~~

如果我未发现的bug，望各位大佬在评论区留言，😜

今天又是学习代码的一天呀，加油，共勉🤞💕

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