弄了一天，异常真难处理！
package user;
public class Book {
String name;
int number;
public Book(int a,String b) {
this.number=a;
this.name=b;
}
void show() {
System.out.println("图书编号为："+number+'\n'+"图书名字为："+name);
}
}
package user;
public class Errora extends Exception {
public Errora(String a) {
super(a);
}
}
package user;
public class Errorb extends Exception {
public Errorb(String b) {
super(b);
}
}
package user;
public class Errorc extends Exception {
public Errorc(String c) {
super(c);
}
}
package user;
import java.util.InputMismatchException;
import java.util.Scanner;
public class Test {
static int d;
static Book[] booklist= {
new Book(1,"金瓶梅"),
new Book(2,"极乐宝鉴"),
new Book(3,"西游记"),
new Book(4,"三国演义"),
new Book(5,"红楼梦"),
new Book(6,"水浒传"),
new Book(7,"如来神掌"),
new Book(8,"周公解梦"),
new Book(9,"山海经")
};
public static void main(String[] args) throws Errora, Errorb, Errorc{
// TODO Auto-generated method stub
System.out.println("请选择查找方式，按序号查找请输入1，按书名查找请输入2");
new Test();
Test.find();
System.out.println("感谢使用，再见！");
}
public static void find() throws Errora, Errorb, Errorc {
try{
Scanner scanner=new Scanner(System.in);
d=scanner.nextInt();
new Test().test();
}catch(InputMismatchException e) {
System.out.println("输入参数类型错误，请重新输入！");
new Test().find();
}
}
void test() throws Errora,Errorb,Errorc {
try {
int count = d;
if(count==1) {
System.out.println("请输入查找的序号，回车确认！");
Scanner scanner2=new Scanner(System.in);
int a=scanner2.nextInt();
switch(a) {
case 1:booklist[0].show();break;
case 2:booklist[1].show();break;
case 3:booklist[2].show();break;
case 4:booklist[3].show();break;
case 5:booklist[4].show();break;
case 6:booklist[5].show();break;
case 7:booklist[6].show();break;
case 8:booklist[7].show();break;
case 9:booklist[8].show();break;
default:throw new Errorb("序号不存在！请重新输入！");
}
}
else if(count==2){
System.out.println("请输入查找的书名，回车确认！");
Scanner scanner3=new Scanner(System.in);
String b=scanner3.next();
int num=0;
for(int i=0;i<booklist.length;i++) {
if(b.contentEquals(booklist[i].name)) {
booklist[i].show();
}
else if(!(b.contentEquals(booklist[i].name))) {
num++;
if(num==9) {
throw new Errorc("图书不存在！请重新输入！");
}
}
}
}
else {
throw new Errora("输入错误！请重新输入！");
}
}
catch(Errora e) {
e.printStackTrace();
new Test().find();
}
catch(Errorb e) {
e.printStackTrace();
new Test().test();
}
catch(Errorc e) {
e.printStackTrace();
new Test().test();
}
}
}
