简单借书系统

package exceptionTest;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
public class BorrowBook {
public static void main(String[] args) {
System.out.println("**欢迎进入借书系统**");
System.out.println("输入命令：1-按名称查找图书 2-按序号查找图书");
Scanner scan = new Scanner(System.in);
int bookNum = scan.nextInt();
if (bookNum==1) {
System.out.println("请输入图书名称：");
try {
Map<String,Integer> map = new HashMap<String,Integer>();//定义一个映射关系用Map存储
map.put("数据库",1);
map.put("高数",2);
map.put("市场营销",3);
map.put("测试技术",4);
String bookName = scan.next();
switch(map.get(bookName)) {
case 1:
System.out.println("book：数据库");
break;
case 2:
System.out.println("book：高数");
break;
case 3:
System.out.println("book：市场营销");
break;
case 4:
System.out.println("book：测试技术");
break;
}
}catch(Exception e){
System.out.println("图书不存在！");
e.printStackTrace();
}
System.out.println("执行完毕！");
}else if(bookNum==2) {
System.out.println("请输入图书序号：");
try {
int bookNum1 = scan.nextInt();
switch(bookNum1) {
case 1:
System.out.println("book：数据库");
break;
case 2:
System.out.println("book：高数");
break;
case 3:
System.out.println("book：市场营销");
break;
case 4:
System.out.println("book：测试技术");
break;
}
}catch(Exception e1) {
System.out.println("图书不存在！");
e1.printStackTrace();
}
System.out.println("执行完毕！");
}else{
System.out.println("命令输入错误，请根据提示输入数字命令！");
}
}

}