第七色在线视频,2021少妇久久久久久久久久,亚洲欧洲精品成人久久av18,亚洲国产精品特色大片观看完整版,孙宇晨将参加特朗普的晚宴

package?imooc_homework;

import?java.util.InputMismatchException;
import?java.util.Scanner;

public?class?Library_demo1?{
????public?static?void?main?(String[]?main){
????????Book[]?books?=?{
????????????new?Book("論語",1),
????????????new?Book("高數(shù)",2),
????????????new?Book("電路",3),
????????????new?Book("大英",4)
????????};??

????????System.out.println("--------圖書系統(tǒng)--------");
????????System.out.println("輸入命令：1-按名稱查書；2-按序號(hào)查書");

????????//?驗(yàn)證命令是否錯(cuò)誤
????????int?checkStatus?=?0;
????????while?(true)?{
????????????checkStatus?=?systemCheckCallack();
????????????if(?checkStatus?!=?1?&&?checkStatus?!=?2?)
????????????????System.out.println("命令錯(cuò)誤，請(qǐng)重新輸入！");
????????????else?break;
????????}

????????while(true)?{
?????????????boolean?exit?=?false;

????????????//?找name
????????????if(checkStatus?==?1)?{
????????????????System.out.print("請(qǐng)輸入圖書名稱(name)：");
????????????????Scanner?scan?=?new?Scanner(System.in);?//?使用者輸入?"大英"
????????????????String?bookName?=?scan.next();?//?使用者輸入字串(不包含空格和tag)

????????????????for?(Book?bookData?:?books)?{
????????????????????if(bookName.equals(bookData.name))?{
????????????????????????System.out.println(?"找到圖書："?+?bookData.name?+?"??序號(hào)為："+bookData.id?);
????????????????????????exit?=?true;
????????????????????}
????????????????}

????????????????if(exit?==?false)?{
????????????????????System.out.println("您要的圖書不存在！");
????????????????}

????????????}
????????????//?找id
????????????else?if?(checkStatus?==?2)?{
????????????????System.out.print("請(qǐng)輸入圖書序號(hào)(id)：");
????????????????Scanner?scan?=?new?Scanner(System.in);?//?使用者輸入?1?or?2?or?other?number
????????????????int?numId?=?scan.nextInt();
????????????????for?(Book?bookData?:?books)?{
????????????????????if(numId?==?bookData.id)?{
????????????????????????System.out.println(?"找到圖書："?+?bookData.name?+?"??序號(hào)為："+bookData.id?);
????????????????????????exit?=?true;
????????????????????}
????????????????}
????????????????if(exit?==?false)?{
????????????????????System.out.println("您要的圖書不存在！");
????????????????}
????????????}

????????????System.out.println("請(qǐng)問是否繼續(xù)查書？1-是?2-否");
????????????int?continueOrNot?=?0;
????????????while(true){
????????????????continueOrNot?=?systemCheckCallack();

????????????????if(continueOrNot?!=?1?&&?continueOrNot?!=?2)?{
????????????????????System.out.println("命令錯(cuò)誤，請(qǐng)重新輸入！");
????????????????}?else?{
????????????????????break;
????????????????}
????????????}
????????????if(continueOrNot?==?2)?{
????????????????System.out.println("感謝您的使用，再見！");
????????????????break;
????????????}
????????}

????}???

????//?使用者輸入內(nèi)容
????public?static?int?systemCheckCallack?()?{
????????Scanner?scan?=?new?Scanner(System.in);

????????while(true)?{
????????????try?{
????????????????//?next()??????字串(不包含空白字元、空白鍵、Tab)
????????????????//?nextInt()???整數(shù)?
????????????????//?nextFloat()?取得使用者輸入的浮點(diǎn)數(shù)
????????????????//?nextLine()??使用者輸入的字串(包含空白字元、空白鍵、Tab)
????????????????int?num?=?scan.nextInt();?
????????????????return?num;
????????????}?catch(InputMismatchException?e)?{
????????????????System.out.println("請(qǐng)根據(jù)提示輸入數(shù)字命令！");
????????????????scan.next();
//????????????????throw?e;
????????????}
????????}

????}

}

package?imooc_homework;

public?class?Book?{
????public?String?name;
????public?int?id;


????public?Book(String?name,?int?id){
????????this.name?=?name;
????????this.id?=?id;
????};

}

How to do

經(jīng)驗(yàn)·與總結(jié)

自定義異常

java中的異常拋出

處理異常0

處理異常方法

檢查異常0

Exception

00001

Throwable

package?com.stx.librarySystem;

import?com.stx.Test.Demo2;

import?java.util.ArrayList;
import?java.util.List;
import?java.util.Scanner;

public?class?library?{
????public?int?input(){
????????System.out.println("輸入命令：1-按照名稱查找圖書；2-按照序號(hào)查找圖書；");
????????Scanner?in?=?new?Scanner(System.in);
????????int?i=0;
????????try{
????????????i=in.nextInt();
????????????return?i;
????????}catch?(Exception?e){
????????????System.out.println("命令輸入錯(cuò)誤！請(qǐng)根據(jù)提示重新輸入數(shù)字命令！");
????????????return?-1;
????????}
????}
????public?static?void?main(String[]?args)?{
????????List<String>?list=new?ArrayList<String>();
????????list.add("數(shù)據(jù)結(jié)構(gòu)");
????????list.add("高數(shù)");
????????list.add("化學(xué)");
????????list.add("物理");
//????????list.forEach((e)->{
//????????????System.out.println(e);
//????????});
????????library?lib?=?new?library();
????????int?i=lib.input();
????????while?(i==-1){
????????????i=lib.input();
????????}

????????if?(i==1){
????????????System.out.println("輸入圖書名稱：");
????????????Scanner?in?=?new?Scanner(System.in);
????????????String?bookname=in.next();
????????????int?rs=list.indexOf(bookname);
????????????if?(rs==-1){
????????????????try?{
????????????????????throw?new?Demo2("圖書不存在！");
????????????????}?catch?(Demo2?demo2)?{
????????????????????demo2.printStackTrace();
????????????????}
????????????}else?{
????????????????System.out.println("book:"+list.get(rs));
????????????}
????????}else?if?(i==2){
????????????System.out.println("輸入圖書序號(hào)：");
????????????Scanner?in?=?new?Scanner(System.in);
????????????int?bookid=in.nextInt();
????????????if?(bookid>list.size()){
????????????????try?{
????????????????????throw?new?Demo2("圖書不存在！");
????????????????}?catch?(Demo2?demo2)?{
????????????????????demo2.printStackTrace();
????????????????}
????????????}else{
????????????????System.out.println("book:"+list.get(bookid-1));
????????????}
????????}
????}
}

模擬借書系統(tǒng)代碼，僅供參考！

import?java.text.SimpleDateFormat;
import?java.util.Calendar;
import?java.util.Date;
public?class?HelloWorld?{
????
????public?static?void?main(String[]?args)?{
//?創(chuàng)建Calendar對(duì)象
Calendar?c?=?Calendar.getInstance();
????????
//?將Calendar對(duì)象轉(zhuǎn)換為Date對(duì)象
Date?date?=?c.getTime();
????????
//?創(chuàng)建SimpleDateFormat對(duì)象，指定目標(biāo)格式
SimpleDateFormat?sdf?=?new?SimpleDateFormat("yyyy-MM-dd?HH:mm:ss");
????????
//?將日期轉(zhuǎn)換為指定格式的字符串
String?now?=?sdf.format(date);
System.out.println("當(dāng)前時(shí)間："?+?now);
}
}