图书管理系统

1.添加图书
2.查看图书
3.删除图书
4.借阅图书
5.归还图书
6.查找图书
0.退出系统

public class LibrarySystem {
    public static void main(String[] args) {
        int[] number = {1,2,3,4,5};//书籍编号
        String[] name = {"数电","模电","计算机基础","",""};//书名
        String[] state = {"未借出","已借出","已借出","",""};//借阅状态
        int[] days = {0,1,2,0,0};//借阅天数
        int[] times = {3,4,5,0,0};//借阅次数
        String state1 = "已借出";//状态1
        String state2 = "未借出";//状态2
        int length = name.length;//定义长度
        out:
        for(;;){
            //系统界面
            System.out.println("----------图书管理系统----------");
            System.out.println("----------1. 添加图书----------");
            System.out.println("----------2. 查看图书----------");
            System.out.println("----------3. 删除图书----------");
            System.out.println("----------4. 借阅图书----------");
            System.out.println("----------5. 归还图书----------");
            System.out.println("----------6. 查找图书----------");
            System.out.println("----------0. 退出系统----------");
            System.out.println("请输入0——6！");
            //创建输入对象
            Scanner impute = new Scanner(System.in);
            String num = impute.next();
            switch (num) {
                case "1"://1.添加
                    for (int i = 0;;i++) {
                        //如果i等于数组的长度，输出“书库已满”并返回菜单
                        if(i==length) {
                            System.out.println("书库已满！");
                            continue out;
                        }
                        //如果名字等于空，开始录入信息
                        if (name[i].equals("")) {
                            System.out.print("请输入你想要添加的书名：");
                            Scanner impute1 = new Scanner(System.in);
                            String name1 = impute1.next();
                            number[i] = i + 1;
                            name[i] = name1;
                            state[i] = state2;
                            days[i] = 0;
                            times[i] = 0;
                            System.out.println("添加成功！");
                            continue out;
                        }
                    }

                case "2"://2.查看
                    System.out.println("编号\t书名\t\t借阅状态\t借阅天数\t借出次数");//输出标题
                    //遍历数组信息
                    for(int i = 0;i<length;i++){
                        //在书名为空时停止输出
                        if(name[i].equals("")){
                            continue out;
                        }else{
                            System.out.println(number[i]+"\t"+name[i]+"\t\t"+state[i]+"\t\t"+days[i]+"\t\t"+times[i]);
                        }
                    }

                case "3"://3.删除
                    System.out.print("请输入你想要删除的书名：");
                    //创建输入对象
                    Scanner impute1 = new Scanner(System.in);
                    String name1 = impute1.next();
                    for(int i = 0;i<length;i++){
                        if(name[i].equals(name1)){
                            for (int j = i;j<length-1;j++){
                                name[j] = name[j+1];
                                state[j] = state[j+1];
                                days[j] = days[j+1];
                                times[j] = times[j+1];
                            }
                            name[length-1] = "";
                            state[length-1] = "";
                            days[length-1] = 0;
                            times[length-1] = 0;
                            System.out.println("删除成功！");
                            continue out;
                        }
                        if(i==length-1){
                            System.out.println("查无此书！请重新输入！");
                            System.out.print("请输入你想要删除的书名：");
                            //创建输入对象
                            Scanner impute2 = new Scanner(System.in);
                            name1 = impute2.next();
                            i = 0;
                        }
                    }

                case "4"://4.借阅
                    System.out.print("请输入借阅的书名：");
                    Scanner impute4 = new Scanner(System.in);
                    String name4 = impute4.next();
                    for(int i = 0;;i++){
                        if(i==length){
                            System.out.println("查无此书！");
                            continue out;
                        }
                        if(name[i].equals(name4)){
                            if(state[i].equals(state1)){
                                System.out.println("此书已借出！");
                            }else{
                                System.out.print("请输入借阅天数：");
                                Scanner impute3 = new Scanner(System.in);
                                int day1 = impute3.nextInt();
                                state[i] = state1;
                                days[i] = day1;
                                times[i]++;
                                System.out.println("书籍已经成功借出！");
                            }
                            continue out;
                        }
                    }

                case "5"://5.归还
                    System.out.print("请输入归还的书名：");
                    Scanner impute5 = new Scanner(System.in);
                    String name5 = impute5.next();
                    for(int i = 0;;i++){
                        if(i==length){
                            System.out.println("查无此书！请重新输入！");
                            System.out.print("请输入归还的书名：");
                            Scanner impute2 = new Scanner(System.in);
                            name5 = impute2.next();
                            i = 0;
                        }
                        if(name[i].equals(name5)){
                            state[i] = state2;
                            days[i] = 0;
                            System.out.println("书籍已经成功归还！");
                            continue out;
                        }
                    }

                case  "6"://6.查找
                    System.out.print("请输入查找的书名：");
                    Scanner impute6 = new Scanner(System.in);
                    String name6 = impute6.next();
                    for(int i = 0;;i++){
                        if(i==length){
                            System.out.println("查无此书！");
                            continue out;
                        }
                        if(name[i].equals(name6)){
                            System.out.println("编号\t书名\t\t借阅状态\t借阅天数\t借出次数");
                            System.out.println((i+1)+"\t"+name[i]+"\t\t"+state[i]+"\t\t"+days[i]+"\t\t"+times[i]);
                            continue out;
                        }
                    }

                case "0"://0.退出系统
                    System.out.println("感谢使用！");
                    break out;

                default://输入错误
                    System.out.println("输入错误！请重新输入！");
            }
        }
    }
}

标签：Java,String,管理系统,System,println,一阶,----------,图书,out
来源： https://blog.csdn.net/lanxiaoDo/article/details/110358225