| package _1020_A; import java.util.Scanner; public class Main { public static Scanner keyboard=new Scanner(System.in); public static void main(String[] args) { String input; while(true) { System.out.print("입력하시오(종료:Z) "); input = keyboard.nextLine(); if(input.equals("Z")) { System.out.println("프로그램을 종료합니다!!"); return; } try { Integer.parseInt(input); System.out.println("숫자입니다!!"); } catch (Exception e) { System.out.println("문자입니다!!"); } } } } | cs |
Java Custom Exception - javatpoint
Java Custom Exception. If you are creating your own Exception that is known as custom exception or user-defined exception.Let's see example of custom exception.
www.javatpoint.com
| package _1020_B; /* * 전화번호 관리 프로그램 구현 프로젝트 * Version 0.5 */ import java.util.Scanner; interface INIT_MENU { int INPUT=1, SEARCH=2, DELETE=3, EXIT=4; } interface INPUT_SELECT { int NORMAL=1, UNIV=2, COMPANY=3; } class PhoneInfo { String name; String phoneNumber; public PhoneInfo(String name, String num) { this.name=name; phoneNumber=num; } public void showPhoneInfo() { System.out.println("name: "+name); System.out.println("phone: "+phoneNumber); } } class PhoneUnivInfo extends PhoneInfo { String major; int year; public PhoneUnivInfo(String name, String num, String major, int year) { super(name, num); this.major=major; this.year=year; } public void showPhoneInfo() { super.showPhoneInfo(); System.out.println("major: "+major); System.out.println("year: "+year); } } class PhoneCompanyInfo extends PhoneInfo { String company; public PhoneCompanyInfo(String name, String num, String company) { super(name, num); this.company=company; } public void showPhoneInfo() { super.showPhoneInfo(); System.out.println("company: "+company); } } class PhoneBookManager { final int MAX_CNT=100; PhoneInfo[] infoStorage=new PhoneInfo[MAX_CNT]; int curCnt=0; static PhoneBookManager inst=null; public static PhoneBookManager createManagerInst() { if(inst==null) inst=new PhoneBookManager(); return inst; } private PhoneBookManager(){} private PhoneInfo readFriendInfo() { System.out.print("이름: "); String name=MenuViewer.keyboard.nextLine(); System.out.print("전화번호: "); String phone=MenuViewer.keyboard.nextLine(); return new PhoneInfo(name, phone); } private PhoneInfo readUnivFriendInfo() { System.out.print("이름: "); String name=MenuViewer.keyboard.nextLine(); System.out.print("전화번호: "); String phone=MenuViewer.keyboard.nextLine(); System.out.print("전공: "); String major=MenuViewer.keyboard.nextLine(); System.out.print("학년: "); int year=MenuViewer.keyboard.nextInt(); MenuViewer.keyboard.nextLine(); return new PhoneUnivInfo(name, phone, major, year); } private PhoneInfo readCompanyFriendInfo() { System.out.print("이름: "); String name=MenuViewer.keyboard.nextLine(); System.out.print("전화번호: "); String phone=MenuViewer.keyboard.nextLine(); System.out.print("회사: "); String company=MenuViewer.keyboard.nextLine(); return new PhoneCompanyInfo(name, phone, company); } public void inputData() throws InputException { System.out.println("데이터 입력을 시작합니다.."); System.out.println("1. 일반, 2. 대학, 3. 회사"); System.out.print("선택>> "); int choice=MenuViewer.keyboard.nextInt(); MenuViewer.keyboard.nextLine(); if(choice > 3 || choice < 1) { throw new InputException(choice); } PhoneInfo info=null; switch(choice) { case INPUT_SELECT.NORMAL: info=readFriendInfo(); break; case INPUT_SELECT.UNIV: info=readUnivFriendInfo(); break; case INPUT_SELECT.COMPANY: info=readCompanyFriendInfo(); break; } infoStorage[curCnt++]=info; System.out.println("데이터 입력이 완료되었습니다. \n"); } public void searchData() { System.out.println("데이터 검색을 시작합니다.."); System.out.print("이름: "); String name=MenuViewer.keyboard.nextLine(); int dataIdx=search(name); if(dataIdx<0) { System.out.println("해당하는 데이터가 존재하지 않습니다. \n"); } else { infoStorage[dataIdx].showPhoneInfo(); System.out.println("데이터 검색이 완료되었습니다. \n"); } } public void deleteData() { System.out.println("데이터 삭제를 시작합니다.."); System.out.print("이름: "); String name=MenuViewer.keyboard.nextLine(); int dataIdx=search(name); if(dataIdx<0) { System.out.println("해당하는 데이터가 존재하지 않습니다. \n"); } else { for(int idx=dataIdx; idx<(curCnt-1); idx++) infoStorage[idx]=infoStorage[idx+1]; curCnt--; System.out.println("데이터 삭제가 완료되었습니다. \n"); } } private int search(String name) { for(int idx=0; idx<curCnt; idx++) { PhoneInfo curInfo=infoStorage[idx]; if(name.compareTo(curInfo.name)==0) return idx; } return -1; } } class MenuViewer { public static Scanner keyboard=new Scanner(System.in); public static void showMenu() { System.out.println("선택하세요..."); System.out.println("1. 데이터 입력"); System.out.println("2. 데이터 검색"); System.out.println("3. 데이터 삭제"); System.out.println("4. 프로그램 종료"); System.out.print("선택: "); } } class Main { public static void main(String[] args) { //Untitled From Jackdclee //https://pastebin.com/DXgRBJG4 //PhoneBookManager은 createManagerInst()함수를 통한 인스턴스 생성만 가능하게 구현(싱글톤 패턴을 이용하기 위해) //PhoneBookManager manager=PhoneBookManager.createManagerInst(); //PhoneBookManager를 담는 변수를 3개 만들고, 변수(레퍼런스)는 3개이지만 PhoneBookManager.createManagerInst(); //싱글톤 패턴을 적용한 클래스이기에 실제로는 하나의 인스턴스에 대한 레퍼런스는 동일하다. PhoneBookManager manager1=PhoneBookManager.createManagerInst(); PhoneBookManager manager2=PhoneBookManager.createManagerInst(); PhoneBookManager manager3=PhoneBookManager.createManagerInst(); //생성자가 Private로 되어있어 생성자를 통한 인스턴스 생성이 불가 //PhoneBookManager managerInst2 = new PhoneBookManager(); int choice; while(true) { MenuViewer.showMenu(); choice=MenuViewer.keyboard.nextInt(); MenuViewer.keyboard.nextLine(); try { if(choice > 4 || choice < 1) { throw new InputException(choice); } } catch (InputException e) { e.printStackTrace(); } switch(choice) { case INIT_MENU.INPUT: try { manager1.inputData(); } catch (InputException e) { e.printStackTrace(); } break; case INIT_MENU.SEARCH: manager2.searchData(); break; case INIT_MENU.DELETE: manager3.deleteData(); break; case INIT_MENU.EXIT: System.out.println("프로그램을 종료합니다."); return; } } } } | cs |
| package _1020_B; public class InputException extends Exception { public InputException(int num) { super(num + "은 잘못된 입력입니다."); } } | cs |
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