public void test2(){
Scanner input=new Scanner(System.in);
System.out.println(“输入命令：1-按照图书名称查询；2-按照图书序号查询”);
try{
int a=input.nextInt();
test1(a);
}catch(Exception e){
System.out.println(“请正确输入：”);
test2();
}

  }
public void test1(int b){
    Scanner input=new Scanner(System.in);
       if(b==1){
       System.out.println("输入图书的名称：");
        String name=input.next();
        if(name.equals("高数")||name.equals("英语")||name.equals("语文")){
            System.out.println("book:"+name);
        }else{
            System.out.println("图书不存在！");
            test2();
             }
       }
       else{
        System.out.println("输入图书的序号：");
        int cc=input.nextInt();
        String sm[]={"语文","数学","英语","政治","健康","财经","日语"};
        if(cc<sm.length){
            System.out.println("book:"+sm[cc]);
        }else{
            System.out.println("图书不存在！");
            test2();
        }
      }
    }

public static void main(String[] args) {
     Initial hobby=new Initial();
     hobby.test2();
}