请大佬指点

//构造方法

public class bookborrow {

book[] books= {new book(1,"高数"),new book(2,"线性代数"),new book(3,"大学物理B")};

Scanner input=new Scanner(System.in);

public void xuhao() {

int a=input.nextInt();

int i;

try {

for(i=0;i<books.length;i++) {

if(a==books[i].getId()) {

System.out.println("图书名称："+books[i].getName());

borrow();

break;

}

else {

System.out.println("你输入的序号不正确！");

borrow();

}

}

}

catch(Exception e) {

}

}

public void mingcheng() {

String b=input.next();

int i;

try {

for(i=0;i<books.length;i++) {

if(b.equals(books[i].getName())) {

System.out.println("图书序号："+books[i].getId());

borrow();

break;

}

else {

System.out.println("输入错误！！！");

borrow();

}

}

}

catch(Exception e) {

}

}

public void borrow() {

System.out.println("输入命令：1.按名称查找图书 2.按序号查找图书：3.退出");

String c=input.next();

if(c.equals("1")) {

System.out.println("请输入图书名称：");

mingcheng();

}

else if(c.equals("2")){

System.out.println("请输入序号：");

xuhao();

}

else if(c.equals("3")){

input.close();

}

else {

System.out.println("输入错误，请重新输入！！！");

borrow();

}

}

//程序入口

public static void main(String[] args) {

// TODO Auto-generated method stub

bookborrow p=new bookborrow();

p.borrow();

}

}

//book类

public class book {

private int id;

private String name;

public   book(int id,String name) {

this.id=id;

    this.name=name;

    }

public int getId() {

return id;

}

public void SetId(int id) {

this.id=id;

}

public String getName() {

return name;

}

public void SetName(String name) {

this.name=name;

}

}