交作业，欢迎改进

import java.util.Scanner;

public class jieShu {

static String shu[] = {"西游记","三国演义","水浒传","红楼梦"};

public static void main(String[] args) {

System.out.println("欢迎进入借书系统！");

jie();

}

public static void jie () {

System.out.println("请选择找书方式：1.按序号查找，2.按名称查找");

try {  

Scanner input = new Scanner(System.in);

int x = input.nextInt();

if (x == 1) {

num();

}else if (x == 2) {

name();

}else {

System.out.println("您输入错误！");

jie();

}

}catch(Exception e) {

System.out.println("请按操作执行！");

jie();

}

}

public static void num() {

try {

System.out.print("请输入序号：");

Scanner input = new Scanner(System.in);

int x = input.nextInt();

if (x==1 || x==2 || x==3 || x==4) {

System.out.println("您借的书为："+shu[x-1]);

System.out.println("是否继续借书？1.是，2.否。");

int y = input.nextInt();

if (y == 1) {

jie();

}else {

System.out.println("欢迎下次光临！");

}

}else {

System.out.println("请输入1-4之间的整数");

}

}catch(Exception e) {

System.out.println("请输入正确的数字！");

num();

}

}

public static void name() {

try {

System.out.print("请输入名称：");

Scanner input = new Scanner(System.in);

String x = input.next();

if (x.equals(shu[0]) || x.equals(shu[1]) || x.equals(shu[2]) || x.equals(shu[3])) {

System.out.println("您借的书为："+x);

System.out.println("是否继续借书？1.是，2.否。");

int y = input.nextInt();

if (y == 1) {

jie();

}else {

System.out.println("欢迎下次光临！");

}

}else {

System.out.println("您输入的书名不存在，请重新输入。");

name();

}

}catch(Exception e) {

System.out.println("请输入正确的书名！");

name();

}

}

}