弄了3小时，终于搞定了。。。。。。
慕虎0571853
2019-01-20 16:52
package bookSystem;
import java.util.Scanner;
public class bookSelectSystem {
public static void main(String[] args) {
bookSelectSystem test = new bookSelectSystem();
test.Select();
}
//####################################################
public void Select() {
String[] bookName= {"JAVA","Python","C++"};
System.out.println("输入命令：1-按书名查找 2-按编号查找");
Scanner input=new Scanner(System.in);
try{//检查输入匹配
int input1=input.nextInt();
if(input1!=1 && input1!=2) {//再判断
throw new Exception();//意外发现
}else if (input1 == 1){//按书名查找######
int v=0;//暂用
System.out.println("请输入书名：");
String inputBookName = input.next();
for(int i=0;i<bookName.length;i++) {
if(inputBookName.equals(bookName[i])) {//需要equals(待研究)
System.out.println("Your book："+bookName[i]);
v=5;//暂用
}
}
if(v==0) {
System.out.println("此书不存在!!");
throw new Exception();
}//至此按书名查找成功实现！#############
}else if(input1==2) {//这里是按编号查找！！！！！
int bookNum;
System.out.println("请输入编号：");
try{//判断输入是否匹配int
bookNum=input.nextInt();
}catch(Exception e) {
System.out.println("请输入正确编号！！(从1开始)");
throw new Exception();
}
if(bookNum<1 || bookNum>bookName.length) {
throw new Exception();
}else {
System.out.println("Your book："+bookName[bookNum-1]);
}
//至此按编号查找实现！！！！！！！！！！
}
}catch(Exception e) {
System.out.println("——情根据提示输入正确命令！——");
Select();
}
}
}
2回答
-
- 慕莱坞7107142
- 2019-01-23 16:17:50
import java.util.Scanner;
public class Library {
public static void main(String[] args) {
Index();
}
public static void Index() {
System.out.println("欢迎进入图书馆查书系统\n请输入您的指令:\n1-按名称查找图书\n2-按编号查找图书\n");
Scanner in = new Scanner(System.in);
int i = in.nextInt();
try {
if (i == 1) {
System.out.println("请输入您需要查找的图书的书名");
name();
} else if (i == 2) {
System.out.println("请输入您需要查找的图书的编号");
number();
} else {
throw new Exception();
}
} catch (Exception e) {
System.out.println("请输入正确指令\n");
Index();
}
}
public static void name() {
Scanner in = new Scanner(System.in);
String str = in.nextLine();
int index = -1;
try {
for (int i = 0; i < BOOK.length; i++) {
if (BOOK[i][1].equals(str)) {
index = i;
break;
}
}
if (index != -1) {
System.out.println("编号: " + BOOK[index][0] + " 书名 " + BOOK[index][1] + " 存在");
} else {
throw new Exception();
}
} catch (Exception e) {
System.out.println("该书不存在,请重新输入正确书名......");
name();
}
}
public static void number() {
Scanner in = new Scanner(System.in);
String str = in.nextLine();
int index = -1;
try {
for (int i = 0; i < BOOK.length; i++) {
if (BOOK[i][0].equals(str)) {
index = i;
break;
}
}
if (index != -1) {
System.out.println("编号: " + BOOK[index][0] + " 书名 " + BOOK[index][1] + " 存在");
} else {
throw new Exception();
}
} catch (Exception e) {
System.out.println("该书不存在，请重新输入正确编号......");
number();
}
}
public static String[][] BOOK = {{"0001","语文"},{"0002","数学"},{"0003","英语"},{"0004","体育"}};
} -
- 慕函数1299684
- 2019-02-09 19:38:20
为什么这个采纳的代码中，方法和数组都写成静态的
Java入门第三季
409792 学习 · 4340 问题
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