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2022-12-14
Java弄一个简易的商品管理系统基于运行命令行窗口
基本功能(基于id进行){card-default label="功能" width="100%"}添加商品删除商品修改商品查找商品遍历商品{/card-default}运行结果测试类package arr; import java.util.Scanner; public class test { public static void main(String[] args) { function fun = new function(); Scanner scanner = new Scanner(System.in); System.out.println("进入系统请按数字进行选择"); System.out.println("----------------------------------------------------"); System.out.println("1:添加商品\t2:删除商品\t3:修改商品\t4:查找商品\t5:遍历商品\t6:商品数量\t0:退出系统"); while (!scanner.hasNext("0")){ String num = scanner.next(); switch (num){ case "1" -> fun.addShop(); case "2" -> fun.delShop(); case "3" -> fun.editShop(); case "4" -> fun.getShop(); case "5" -> fun.traverse(); case "6" -> System.out.println(fun.size); default -> System.out.println("输入错误退出请按0"); } } } } 方法类package arr; import java.util.Scanner; public class function { //初始化 int h = 6,l=4; String[][] db = new String[h][l]; //记录商品数量 int size = 0; Scanner scanner = new Scanner(System.in); public void addShop(){ System.out.println("-------------请按照提示依次输入-------------"); System.out.println("请输入商品名字"); String name = scanner.next(); System.out.println("请输入商品介绍"); String introduce = scanner.next(); System.out.println("请输入商品价格"); String price = scanner.next(); if (name==""||name==null||introduce==""||introduce==null||price==""||price==null){ System.out.println("添加失败:提交参数为空禁止"); }else { //id db[size][0] = String.valueOf(size + 1); //名字 db[size][1] = name; //介绍 db[size][2] = introduce; //价格 db[size][3] = price; size++; System.out.println("添加成功"); } } public void delShop(){ System.out.println("-------------商品列表-------------"); //遍历 traverse(); System.out.println("\n-------------请输入商品ID进行删除-------------"); int id = scanner.nextInt(); if (id>size){ System.out.println("删除失败:id错误"); }else { delShop(String.valueOf(id)); } } public void delShop(String id){ for (int i = 0;i< size;i++){ if (db[i][0].equals(id)) { for (int j = i+1;j<size;j++){ db[i]=db[i+1]; } size--; System.out.println("删除成功"); } } } public void editShop(){ System.out.println("-------------商品列表-------------"); //遍历 traverse(); System.out.println("\n-------------请根据提示进行修改-------------"); System.out.println("请输入id"); int id = scanner.nextInt(); System.out.println("请输入需要修改的属性"); String element = scanner.next(); System.out.println("请输入value的值修改为"); String value = scanner.next(); if (id>size){ System.out.println("修改错误:id错误"); }else { editShop(String.valueOf(id),element,value); } } public void editShop(String id,String element,String value){ int y; switch (element){ case "name" -> y = 1; case "introduce" -> y=2; case "price" -> y =3; default -> y = 0; } db[Integer.parseInt(id)-1][y]= value; System.out.println("修改成功"); } public void getShop(){ System.out.println("请输入商品名字"); String name = scanner.next(); for (int i =0;i<size;i++){ if (db[i][1].contains(name)) { start(i); } } } public void start(int i) { System.out.print("[id="+(i+1)); for (int j = 0;j<db[i].length;j++){ if (j==0) System.out.print(",name="+db[i][j+1]); if (j==1) System.out.print(",introduce="+db[i][j+1]); if (j==2) System.out.print(",price="+db[i][j+1]+"]"); } } //遍历商品 public void traverse(){ for (int i = 0;i< size;i++){ start(i); System.out.println(); } } } 基于上面改的学生管理系统,进行了代码逻辑的升级,这里只提供方法类package arr; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Scanner; public class function { public function() { addStudent("张三","18","男","苗","贵州省","大学","贵州大学"); addStudent("张4","19","男","苗","贵州省","大学","贵州大学"); addStudent("张5","189","男","苗","贵州省","大学","贵州大学"); addStudent("张6","18","男","苗","贵州省","大学","贵州大学"); addStudent("张7","18","男","苗","贵州省","大学","贵州大学"); addStudent("张8","18","男","苗","贵州省","大学","贵州大学"); addStudent("张9","18","男","苗","贵州省","大学","贵州大学"); addStudent("张99","18","男","苗","贵州省","大学","贵州大学"); } //初始化 int h = 6,l=8; String[][] db = new String[h][l]; //记录学生数量 int size = 0; Scanner scanner = new Scanner(System.in); public void addStudent(){ System.out.println("-------------请按照提示依次输入-------------"); System.out.println("请输入学生名字"); String name = scanner.next(); System.out.println("请输入"+name+"的年龄"); String age = scanner.next(); System.out.println("请输入"+name+"的性别"); String sex = scanner.next(); System.out.println("请输入"+name+"的民族"); String nation = scanner.next(); System.out.println("请输入"+name+"的地址"); String address = scanner.next(); System.out.println("请输入"+name+"的学历"); String degree = scanner.next(); System.out.println("请输入"+name+"的学校"); String school = scanner.next(); if (name.equals("")||age.equals("")||sex.equals("")||nation.equals("")||address.equals("")||degree.equals("")||school.equals(""))System.out.println("添加失败:提交参数有空禁止添加"); else addStudent(name,age,sex,nation,address,degree,school); } public void addStudent(String...arr){ if (db.length==size) db=expansion(db);//扩容 String date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()); db[size][0]=date; for (int i=1,j=0;i<=l-1;i++,j++)db[size][i]=arr[j]; size++; System.out.println("添加成功"); } public void delStudent(){ System.out.println("-------------学生列表-------------"); traverse(); System.out.println("\n-------------请输入学生ID进行删除-------------"); int id = scanner.nextInt(); if (id>size||id<0)System.out.println("删除失败:id错误"); else delStudent(id); } public void delStudent(int id){ for (int j = id-1;j<size;j++)db[j]=db[j+1]; size--; if (db.length/2>size&&db.length<6) db=UnExpansion(db);//缩容 System.out.println("删除成功"); } public void editStudent(){ System.out.println("-------------学生列表-------------"); traverse(); System.out.println("\n-------------请根据提示进行修改-------------"); System.out.println("请输入id"); int id = scanner.nextInt(); System.out.println("请选择你要修改的属性(不区分大小写可以是数字1开头)"); System.out.println("A:名字\tB:年龄\tC:性别\tD:民族\tE:地址\tF:学历\tG:学校"); String element = scanner.next(); int position; switch (element){ case "a", "A","1" -> { element="name"; position=1; } case "b", "B","2" -> { element="age"; position=2; } case "c", "C","3" -> { element="sex"; position=3; } case "d", "D","4" -> { element="nation"; position=4; } case "e", "E","5" -> { element="address"; position=5; } case "f", "F","6" -> { element="degree"; position=6; } case "g", "G","7" -> { element="school"; position=7; } default -> { System.out.println("抱歉输入错误请重新选择功能"); return; } } System.out.println("将"+element+"的值修改为"); String value = scanner.next(); if (id>size||id<0)System.out.println("修改错误:id错误"); else editStudent(id,value,position); } public void editStudent(int id,String value,int y){ db[id-1][y]= value; System.out.println("修改成功"); } public void getStudent(){ System.out.println("请输入学生名字或者录入时间进行查询(支持模糊查询)"); String name = scanner.next(); for (int i =0;i<size;i++){ if (db[i][1].contains(name)||db[i][0].contains(name)) start(i); else if (i==size - 1) System.out.println("抱歉没有该学生的信息"); } } public void start(int i) { System.out.print("[id="+(i+1)); for (int j = 0;j<db[i].length;j++){ switch (j){ case 0 ->System.out.print(",date="+db[i][j]); case 1 ->System.out.print(",name="+db[i][j]); case 2 ->System.out.print(",age="+db[i][j]); case 3 ->System.out.print(",sex="+db[i][j]); case 4 ->System.out.print(",nation="+db[i][j]); case 5 ->System.out.print(",address="+db[i][j]); case 6 ->System.out.print(",degree="+db[i][j]); case 7 ->System.out.print(",school="+db[i][j]+"]"); default -> System.out.println("怎么会出错?"); } } } //遍历学生 public void traverse(){ if (size==0)System.out.println("抱歉没有学生哦,你可以按1进行添加"); else { for (int i = 0;i< size;i++){ start(i); System.out.println("\n--------------------------------------------------------------------------------------------"); } } } //扩容 public String[][] expansion(String[][] arr){ String[][] temp = new String[arr.length*2][l]; for (int i = 0 ;i<arr.length;i++){ for (int j = 0;j<arr[i].length;j++){ temp[i][j]=arr[i][j]; } } return temp; } public String[][] UnExpansion(String[][] arr){ String[][] temp = new String[arr.length/2][l]; for (int i = 0 ;i<size;i++){ for (int j = 0;j<arr[i].length;j++){ temp[i][j]=arr[i][j]; } } return temp; } }
2022年12月14日
11 阅读
0 评论
3 点赞
2022-12-09
Java基础测试2
Chapter 02循环结构{card-default label="考察内容" width="100%"}Key Point :1.while循环2.do while循环3.for循环4.obreak5.continue{/card-default}题目图片{tabs}{tabs-pane label="第一页"} {/tabs-pane}{tabs-pane label="第二页"}{/tabs-pane}{tabs-pane label="第三页"}{/tabs-pane}{/tabs}一public class Method { public static void main(String[] args) { int sum = 0; for (int i = 0; i <=100; i++) { sum+=i; } System.out.println(sum); } }二public class Method { public static void main(String[] args) { int sum = 0; for (int i = 1; i <100; i+=2) { sum+=i; } System.out.println(sum); } }三public class Method { public static void main(String[] args) { int j=0,sum1=0; while (j<=100){ sum1+=j; j++; } System.out.println(sum1); int sum = 0; int i=1; do { sum+=i; i+=2; }while (i<100); System.out.println(sum); } } 四 import java.util.Scanner; public class Method { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("输入一个小于10的整数"); int n = sc.nextInt(); int sum = 1; if (n>9)return; for (int i =1;i<=n;i++)sum*=i; System.out.println(n+"的阶乘为:"+sum); } }五public class Method { public static void main(String[] args) { int sum = 0; for (int i = 1; i <=100;i++ ) { if (i%3==0&&i%5!=0) sum+=i; } System.out.println(sum); } }六public class Method { public static void main(String[] args) { for (int x = 0; x < 20; x++) { for (int y = 0; y < 33; y++) { int z = 100 - x - y; if ((z % 3 == 0) && (x * 5 + y * 3 + z / 3 == 100))System.out.println("公鸡:"+x+" 母鸡:"+y+" 小鸡:"+z); } } } } 七public class Method { public static void main(String[] args) { for (int x = 0; x < 8; x++) { for (int y = 0; y < 12; y++) { int z = 36 - x - y; if ((z % 3 == 0) && (x * 4 + y * 3 + z / 2 == 36))System.out.println("男:"+x+" 女:"+y+" 小孩:"+z); } } } } 八public class Method { public static void main(String[] args) { for (int x = 1000; x < 10000; x++) { int ge=x%10; int shi=x/10%10; int bai=x/100%10; int qian=x/1000; int i = (qian * 10 + bai) + (shi * 10 + ge); if(x== i * i)System.out.println(x); } } }九import java.util.Scanner; public class Method { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("输入n"); int n = sc.nextInt(); for (int i = 1 ;i<=n; i++){ for (int j = n; j > i; j--) { System.out.print(" "); } for (int j = 0; j < (2*i)-1; j++) { System.out.print("*"); } System.out.println(""); } } } 十public class Method { public static void main(String[] args) { for(int i = 1;i<10;i++){ for(int j = 1;j<=i;j++){ if(j==3&&i==3||j==3&&i==4){ System.out.print(" "+j+"×"+i+"="+(i*j)+" "); }else{ System.out.print(j+"×"+i+"="+(i*j)+" "); } } System.out.println(); } } }十一public class Method { public static void main(String[] args) { int a,b,c; for(int i = 100;i<999;i++){ a = i/100; b = i%100/10; c = i%100%10; if (a*a*a+b*b*b+c*c*c==i) System.out.println(i); } } }
2022年12月09日
13 阅读
0 评论
1 点赞
2022-12-09
Java基础测测试1
Chapter 01语言基础{card-default label="考察点" width="100%"}包的基本语法Java 语言中的标识符,命名规范八种基本类型基本操作符if - elseswitch{/card-default}题目图片{tabs}{tabs-pane label="第一页"} {/tabs-pane}{tabs-pane label="第二页"}{/tabs-pane}{tabs-pane label="第三页"}{/tabs-pane}{/tabs}{card-default label="答案" width="100%"}C、D、F错误 reason:变量名不能包含.和@不能以数字开头,其余是对的b=16(1)这段代码错误,计算出来的结果为Int类型(2)假设正确值为80(3)int realPrice = price乘8/10;或者 short realPrice = (short) (price乘8/10);{/card-default}四int n = 123; int g = n%10; int s = n%100/10; int b = n/100; System.out.println(g); System.out.println(s); System.out.println(b);五import java.util.Scanner; public class Method { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("请分别输入a和b的值:"); int a = sc.nextInt(); int b = sc.nextInt(); System.out.println((a%b==0)?"b是a的因子":"b不是a的因子"); } } 六import java.util.Scanner; public class Method { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("请输入n条结果:"); int n=sc.nextInt(); System.out.println("请输入单页m条记录:"); int m=sc.nextInt(); System.out.println("请输入第i页:"); int i=sc.nextInt(); if(i<=(n/m+1)){ if(n%m==0){ System.out.println("第"+i+"页显示第"+((i*m)-m+1)+"到第"+(i*m)+"条"); }else if(n%m!=0){ System.out.println("第"+i+"页显示第"+((i*m)-m+1)+"到第"+((i-1)*m+n%m)+"条"); } }else{ System.out.println("请重新输入!"); } } } 七 import java.util.Scanner; public class Method { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int year = sc.nextInt(); if (year<6) System.out.println("儿童"); else if (year< 12) System.out.println("少年"); else if (year<17) System.out.println("青少年"); else if (year<35) System.out.println("青年"); else if (year<50) System.out.println("中年"); else System.out.println("中老年"); } }八import java.util.Scanner; public class Method { public static void main(String[] args) { Scanner sc = new Scanner(System.in); switch (sc.nextInt()) { case 1-> System.out.println("贝贝"); case 2-> System.out.println("晶晶"); case 3-> System.out.println("欢欢"); case 4-> System.out.println("迎迎"); case 5-> System.out.println("妮妮"); default -> System.out.println("北京欢迎您"); } } }九 import java.util.Scanner; public class Method { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int year = sc.nextInt(); if ((year % 4) == 0 && (year % 100) != 0 || (year % 400) == 0) System.out.println(year+"年是闰年"); else System.out.println(year+"年不是闰年"); } } 十import java.util.Scanner; public class Method { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("请输入工资"); double wages = sc.nextInt(); double taxes,wage; double gz = wages-3500; if (gz>=1500&&gz<=1500){ taxes = (wages-262-3500)*0.03; wage = wages - taxes -262; System.out.println("应当缴纳的个人所得税:"+taxes+"\t税后收入:"+wage); } else if (gz>1500&&gz<=4500) { taxes = (wages-262-3500)*0.10-105; wage = wages - taxes -262; System.out.println("应当缴纳的个人所得税:"+taxes+"\t税后收入:"+wage); }else if (gz > 4500&&gz<=9000){ taxes = (wages-262-3500)*0.20-555; wage = wages - taxes -262; System.out.println("应当缴纳的个人所得税:"+taxes+"\t税后收入:"+wage); }else if (gz > 9000&&gz <=35000){ taxes = (wages-262-3500)*0.25-1005; wage = wages - taxes -262; System.out.println("应当缴纳的个人所得税:"+taxes+"\t税后收入:"+wage); }else if (gz > 35000&&gz <=55000){ taxes = (wages-262-3500)*0.30-2775; wage = wages - taxes-262; System.out.println("应当缴纳的个人所得税:"+taxes+"\t税后收入:"+wage); }else if (gz > 55000&&gz <=80000){ taxes = (wages-262-3500)*0.35-5505; wage = wages - taxes-262; System.out.println("应当缴纳的个人所得税:"+taxes+"\t税后收入:"+wage); }else if (gz > 80000){ taxes = (wages-262-3500)*0.45-13505; wage = wages - taxes-262; System.out.println("应当缴纳的个人所得税:"+taxes+"\t税后收入:"+wage); }else { System.out.println("您不配交税"); } } }
2022年12月09日
10 阅读
0 评论
0 点赞
2022-12-08
网站禁止F12和检查网页代码
采用JavaScript来进行禁止F12当然对于小白来说你设置了代码那他确实没办法对于懂点计算机的还是能轻松绕过的代码这次我们这个禁止F12稍微进行了升级,别人按F12会直接让网页内容为空点检查只要控制台高度超过一定的值就会网页为空,自己可以改<script type="text/javascript"> $(function(){ var winHeight = $(document).scrollTop(); $(window).scroll(function() { var scrollY = $(document).scrollTop();// 获取垂直滚动的距离,即滚动了多少 if (scrollY > 200){ //如果滚动距离大于550px则隐藏,否则删除隐藏类 $('.left_ads').addClass('hiddened'); } else { $('.left_ads').removeClass('hiddened'); } if (scrollY > winHeight){ //如果没滚动到顶部,删除显示类,否则添加显示类 $('.left_ads').removeClass('showed'); } else { $('.left_ads').addClass('showed'); } }); }); </script> <script type="text/javascript"> //判断F12审查元素 function fuckyou() { window.close(); //关闭当前窗口(防抽) window.location = "about:blank"; //将当前窗口跳转置空白页 } function ck() { console.profile(); console.profileEnd(); //我们判断一下profiles里面有没有东西,如果有,肯定有人按F12了,没错!! if(console.clear) { console.clear() }; if(typeof console.profiles == "object") { return console.profiles.length > 0; } } function hehe() { if((window.console && (console.firebug || console.table && /firebug/i.test(console.table()))) || (typeof opera == 'object' && typeof opera.postError == 'function' && console.profile.length > 0)) { fuckyou(); } if(typeof console.profiles == "object" && console.profiles.length > 0) { fuckyou(); } } hehe(); window.onresize = function() { if((window.outerHeight - window.innerHeight) > 200) //判断当前窗口内页高度和窗口高度,如果差值大于200,那么呵呵 fuckyou(); } </script>
2022年12月08日
21 阅读
0 评论
1 点赞
2022-12-07
今日Java作业
作业题目1、00101010 | 00010111语句的执行结果为2、00101010 & 00010111语句的执行结果为3、37.2%10的运算结果为4、定义一个华氏度,转换成相应的摄氏度输出。(转换规则:摄氏度=5/9*(华氏度–32))5、定义一个三位整数,分别输出其个位、十位和百位6、定义一个四位整数,分别输出其个位、十位和百位、千位7、完成打印输出Java所有基本数据类型及所占字节数,格式如效果图。类型所占字节取值范围占多少位byte1字节-2^7~2个7-18位short 2字节-2个15~2个15-116位int4字节-2个31~2个31-132位8、从键盘输入三角形的底和高,并输出三角形的面积。9、从控制台输入学员王浩3门课程(Java、SQL、Php)成绩,编写程序实现(1) Java课和SQL课的分数之差(2)3门课的平均分10、定义两个变量int a = 10 int b = 20 ,交换两个变量的值11、选做题某个公司采用公用电话传递数据,数据是四位的整数,在传递过程中是加密的,加密规则如下:每位数字都加上3然后除以10的余数代替该数字,再将第一位和第四位交换,第二位和第三位交换。要求:键盘上输入四位号码,求加密后的号码为多少?答案题目简单不做思路分析,思路分析请搜索上一次的Java作业import java.util.Scanner; public class work { public static void main(String[] args) { System.out.println(00101010 | 00010111); //37449 System.out.println(00101010 & 00010111); //8 System.out.println(37.2%10); //7.200000000000003 Scanner sc = new Scanner(System.in); System.out.println("输入摄氏度"); float c = sc.nextFloat(); float jg = c*9/5+32; System.out.println("温度转换结果为:"+jg); //-------------------------------- tree(); //-------------------------------- four(); System.out.println("类型 所占字节 取值范围 占多少位"); System.out.println("byte 1字节 -2^7~2^7-1 8位"); System.out.println("short 2字节 -2^15~2^15-1 16位"); System.out.println("int 4字节 -2^31~2^31-1 32位"); //--------------- five(); sex(); //交换 int a = 10; int b = 20; int tmp = a; a=b;b=tmp; //最后 seven(); } public static void tree() { Scanner sc = new Scanner(System.in); System.out.println("输入一个三位数"); int num = sc.nextInt(); if (num>99 && num <1000){ int bai = num/100; int shi = num%100/10; int ge = num%100%10; System.out.println("百分位:"+bai+" 十分位:"+shi+" 个位:"+ge); }else { System.out.println("输入的不是一个三位整数"); } } //第四个 public static void four() { Scanner sc = new Scanner(System.in); System.out.println("输入一个四位数"); int num = sc.nextInt(); if (num>999 && num <10000){ int qian = num/1000; int bai = num%1000/100; int shi = num%1000%100/10; int ge = num%1000%100%10; System.out.println("千分位:"+qian+" 百分位:"+bai+" 十分位:"+shi+" 个位:"+ge); }else { System.out.println("输入的不是一个四位整数"); } } public static void five() { Scanner sc = new Scanner(System.in); System.out.println("输入高度"); int h = sc.nextInt(); System.out.println("输入底"); int sd = sc.nextInt(); System.out.println("梯形的面积为:"+(sd*h/2)); } public static void sex(){ Scanner sc = new Scanner(System.in); System.out.println("输入java成绩"); int Java = sc.nextInt(); System.out.println("输入SQL成绩"); int Sql = sc.nextInt(); System.out.println("输入PHP成绩"); int Php = sc.nextInt(); System.out.println("--------王浩同学的成绩--------"); System.out.println("Java:"+Java); System.out.println("SQL:"+Sql); System.out.println("PHP:"+Php); System.out.println("平均分为:"+((Java+Sql+Php)/3)); } public static void seven(){ Scanner sc = new Scanner(System.in); System.out.println("四位号码"); int num = sc.nextInt(); if (num>999 && num <10000){ int qian = (num/1000+3)%10; int bai = (num%1000/100+3)%10; int shi = (num%1000%100/10+3)%10; int ge = (num%1000%100%10+3)%10; qian = ge; ge = tmp; tmp = bai; bai=shi; shi=tmp; System.out.println("加密后:"+qian+bai+shi+ge); }else { System.out.println("输入的不是一个四位整数"); } } } 运行结果太多了懒得截图
2022年12月07日
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