class 16-17 : 자바 (패키지, 클래스, 제네릭, 컬렉션 등)

yoneeki·2023년 2월 9일

목록 보기

12/31

StringBuffer

import java.util.StringTokenizer;

public class StringBufferEx {

  public static void main(String[] args) {
    StringBuffer sb = new StringBuffer("This");
    System.out.println(sb);

    sb.append(" is pencil.");
    System.out.println(sb);

    sb.insert(8, "my "); // 8번째 인덱스에 my를 추가할 것
    System.out.println(sb);

    sb.replace(8, 10, "your"); // 8-10번째 인덱스를 your로 바꿀 것
    System.out.println(sb);

    sb.delete(8, 13); // 8-13 인덱스를 지울 것
    System.out.println(sb);

    String query = "name=kitae&addr=seoul&age=21";
    StringTokenizer st = new StringTokenizer(query, "&"); // 쿼리를 &기준으로 잘라서 객체로 보관하겠다
    while (st.hasMoreTokens()) {
      System.out.print(st.nextToken() + "\t");
    }
    System.out.println();
    for (int i = 0; i < st.countTokens(); i++) {
      System.out.print(st.nextToken() + "\t");
    }

    String txt = "릴리/아이리스/로즈/아네모네";
    String[] txtArr = txt.split("/"); // 문장을 /기준으로 잘라서 배열로 보관하겠다
    for (int i = 0; i < txtArr.length; i++) {
      System.out.print(txtArr[i] + "\t");
    }
    System.out.println();

    String txt02 = "릴리/아이리스/로즈/아네모네:토끼:고양이:강아지";
    StringTokenizer st02 = new StringTokenizer(txt02, ":/");
    // :와 / 둘 다기준으로 하여 잘라 객체로 보관하겠다
    while (st02.hasMoreTokens()) {
      System.out.print(st02.nextToken() + "\t");
    }
    System.out.println();
  }
}

### 출력
This
This is pencil.
This is my pencil.
This is your pencil.
This is pencil.
name=kitae      addr=seoul      age=21
릴리    아이리스        로즈    아네모네
릴리    아이리스        로즈    아네모네        토끼    고양이  강아지

Math

import java.util.Arrays;

public class MathEx {

  public static boolean exist(int num, int[] numArr) {
    for (int i = 0; i < numArr.length; i++) {
      if (num == numArr[i]) {
        return true;
      }
    }
    return false;
  }

  public static void main(String[] args) {
    System.out.println(Math.PI);
    System.out.println(Math.ceil(3.14));
    System.out.println(Math.floor(Math.PI));
    System.out.println(Math.sqrt(9)); // 루트(제곱근) 구하기
    System.out.println(Math.exp(2)); // e^x(:파라미터) 값을 반환 (자연상수 e : 2.71)
    System.out.println(Math.round(Math.PI));

    int[] count = new int[6];
    int index = 0;

    for (int i = 0; i < count.length; i++) {
      do { // 중복 안 되게 로또 번호 추출
        index = (int) (Math.random() * 45) + 1;
      } while (MathEx.exist(index, count));
      count[i] = index;
    }

    Arrays.sort(count); // 오름차순 정렬
    for (int i = 0; i < count.length; i++) {
      System.out.print(count[i] + " ");
    }
  }
}

### 출력
3.141592653589793
4.0
3.0
3.0
7.38905609893065
3
1 2 6 26 37 42

Calendar

import java.util.Calendar;

public class CalendarEx {

  public static void main(String[] args) {
    Calendar now = Calendar.getInstance();
    int year = now.get(Calendar.YEAR);
    int month = now.get(Calendar.MONTH) + 1;
    int day = now.get(Calendar.DAY_OF_WEEK);
    //int day2 = now.get(Calendar.DAY_OF_MONTH);
    int hour = now.get(Calendar.HOUR);
    String yoil;

    // prettier-ignore
    if (day == 1) yoil = "일"; 
    else if (day == 2) yoil = "월"; else if (day == 3) yoil = "화"; 
    else if (day == 4) yoil = "수"; else if (day == 5) yoil = "목"; 
    else if (day == 6) yoil = "금"; else if (day == 7) yoil = "토"; 
    else yoil = "None";

    // prettier-ignore
    System.out.println(
      year + "년\t" + month + "월\t" + yoil + "요일(" + day + ")\t" + hour + "시"
    );
    System.out.println(Calendar.HOUR_OF_DAY);
    System.out.println(Calendar.AM_PM);
  }
}

### 출력
2023년  2월     목요일(5)       10시
11
9

실습

데이터 변형

package Practice;

public class Practice050607 {

  public static void main(String[] args) {

    /*** 6 */
    // (1)
    Integer s1 = new Integer(20);
    int s1Val = s1.intValue();
    System.out.println(s1Val);
    // (2)
    String str = "35.9";
    double d = Double.valueOf(str);
    System.out.println(d);
    // (3)
    String str2 = "true";
    boolean b = Boolean.valueOf(str2);
    System.out.println(b);
    // (4)
    String biNum = Integer.toBinaryString(30);
    System.out.println(biNum);
    // (5)
    String c = String.valueOf('c');
    System.out.println(c);

    /*** 7 */
    // (1)
    String a = "가나다";
    String b1 = new String(a);
    System.out.println(a + "/" + b1);
    System.out.println(a == b1);
    // false가 나옴. 서로 다른 객체이기 때문.
    // 반면에 -> System.out.println(a.equals(b1)); 이건 true가 나옴

    /*** 8 */
    String a8 = new String("     Oh, Happy      ");
    String b8 = a8.trim();
    String c8 = b8.concat(" Day.");
    System.out.println(a8 + "\n" + b8 + "\n" + c8);
  }
}

### 출력
20
35.9
true
11110
c
가나다/가나다
false
     Oh, Happy
Oh, Happy
Oh, Happy Day.

객체를 배열로 생성

import java.util.Scanner;

class Person2 {

  private String name;
  private int[] gameResult = new int[3];
  Scanner sc = new Scanner(System.in);

  public Person2(String name) {
    this.name = name;
  }

  public String getName() {
    return this.name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public int[] getGameResult() {
    return this.gameResult;
  }

  public int[] playGamble() {
    System.out.print(name + " 님 게임을 시작합니다 (Enter) >> ");
    sc.nextLine();

    for (int i = 0; i < gameResult.length; i++) {
      gameResult[i] = (int) ((Math.random()) * 3) + 1;
    }

    if (!jackpot(gameResult)) {
      for (int i = 0; i < gameResult.length; i++) {
        System.out.print("\t" + gameResult[i] + "\t");
      }
      System.out.println(" ( " + name + "님 이겼습니다. ) ");
    } else {
      for (int i = 0; i < gameResult.length; i++) {
        System.out.print("\t" + gameResult[i] + "\t");
      }
      System.out.println(" ( " + name + "님 아쉽군요! ) ");
    }

    return gameResult;
  }

  public boolean jackpot(int[] gameResult) {
    int num = gameResult[0];

    for (int i = 0; i < gameResult.length; i++) {
      if (gameResult[i] != num) {
        return true; // 게임에서 졌음
      }
    }

    return false; // 게임에서 이겼음
  }
}

public class Gambling2 {

  public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
    System.out.print("게임에 참가할 선수 숫자 >> ");
    int participants = scanner.nextInt();

    Person2[] players = new Person2[participants];

    for (int i = 0; i < players.length; i++) {
      System.out.print((i + 1) + " 번째 선수 이름 >> ");
      String name = scanner.next();
      players[i] = new Person2(name);
    }

    boolean gameEnding = true;

    while (gameEnding) {
      int res[] = {};
      for (int i = 0; i < players.length; i++) {
        res = players[i].playGamble();
        gameEnding = players[i].jackpot(res);
        if (!gameEnding) {
          System.out.println(players[i].getName() + " 님의 승리로 종료");
          break;
        }
      }
    }

    scanner.close();
  }
}

Calendar 응용

package practice;

import java.util.Calendar;
import java.util.Scanner;

class Player01 {

  private String name;
  private Scanner scanner = new Scanner(System.in);

  public Player01(String name) {
    this.name = name;
  }

  public String getName() {
    return this.name;
  }

  public int turn() {
    // 현재 시간 추출
    System.out.println(name + "님 시작 enter를 누르세요.");
    scanner.nextLine();
    Calendar calendar = Calendar.getInstance();
    int startSec = calendar.get(Calendar.SECOND);
    System.out.println("현재 초 : " + startSec);
    System.out.println("10초 기다렸다가 enter 눌러주세요.");
    scanner.nextLine();
    calendar = Calendar.getInstance();
    int endSec = calendar.get(Calendar.SECOND);
    if (startSec > endSec) {
      endSec += 60;
    }
    System.out.println("현재 초 : " + endSec);
    return Math.abs(endSec - startSec);
  }
}

class Game {

  public void run() {
    Player01 p01 = new Player01("황기태");
    Player01 p02 = new Player01("이재문");
    System.out.println("10초에 가깝게 누른 사람이 승리하는 게임입니다.");
    int duration01 = p01.turn();
    int duration02 = p02.turn();
    System.out.println(
      p01.getName() +
      "의 결과 " +
      duration01 +
      "===" +
      p02.getName() +
      "의 결과 " +
      duration02
    );
    System.out.println("두구두구두구 둥둥둥 승자는 : ");
    if (Math.abs(10 - duration01) < Math.abs(10 - duration02)) {
      System.out.println(p01.getName() + "님 승리");
    } else if (Math.abs(10 - duration01) > Math.abs(10 - duration02)) {
      System.out.println(p02.getName() + "님 승리");
    } else {
      System.out.println("비김");
    }
  }
}

public class Practice06 {

  public static void main(String[] args) {
    Game game = new Game();
    game.run();
  }
}

Vector

Ex.01

import java.util.Vector;

public class VectorEx {

  public static void main(String[] args) {
    Vector<Integer> vec = new Vector<>();

    vec.add(1);
    vec.add(3);
    vec.add(4);

    System.out.println(vec.size());

    vec.add(1, 2);

    for (int i = 0; i < vec.size(); i++) {
      System.out.print(vec.get(i) + "  ");
    }

    System.out.println();

    for (int item : vec) {
      System.out.print(item + "  ");
    }
  }
}

Ex.02

package Practice;

import java.util.Scanner;
import java.util.Vector;

public class Practice01 {

  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    Vector<Integer> vec = new Vector<>();
    int biggest = 0;

    while (true) {
      System.out.print("정수 입력 (until -1) >> ");
      int num01 = sc.nextInt();
      if (num01 == -1) break;

      vec.add(num01);
    }

    for (int i = 0; i < vec.size() - 1; i++) {
      if (vec.get(biggest) < vec.get(i)) {
        biggest = i;
      }
    }

    System.out.println("제일 큰 수는 : " + vec.get(biggest));
    sc.close();
  }
}

Iterator

import java.util.Iterator;
import java.util.Vector;

public class IteratorEx {

  public void main(String[] args) {
    Vector<Integer> vec = new Vector<>();
    vec.add(1);
    vec.add(2);
    vec.add(2, 3);
    vec.add(88);
    vec.add(77);
    vec.add(99);

    Iterator<Integer> it = vec.iterator(); // 순환 가능한지 아닌지
    int sum = 0;

    while (it.hasNext()) {
      int num = it.next();
      System.out.print(num + " : " + it.hasNext() + "\n");
      sum += num;
    }

    System.out.println("sum : " + sum);
  }
}

ArrayList

Ex.01

import java.util.ArrayList;
import java.util.Scanner;

public class ArrayListEx {

  public static void main(String[] args) {
    ArrayList<String> arrlist = new ArrayList<>();
    Scanner sc = new Scanner(System.in);
    for (int i = 0; i < 4; i++) {
      System.out.print("이름 입력 >> ");
      String name = sc.nextLine();
      arrlist.add(name);
    }

    int longest = 0;
    for (int i = 0; i < arrlist.size(); i++) {
      if (arrlist.get(longest).length() < arrlist.get(i).length()) {
        longest = i;
      }
    }
    System.out.println("이름 제일 긴 사람 : " + arrlist.get(longest));
    sc.close();
  }
}

Ex.02

package Practice;

import java.util.ArrayList;
import java.util.Scanner;

class Student {

  private String stuName;
  private String stuDepart;
  private String stuNum;
  private double stuGrade;

  public String getStuName() {
    return this.stuName;
  }

  public void setStuName(String stuName) {
    this.stuName = stuName;
  }

  public String getStuDepart() {
    return this.stuDepart;
  }

  public void setStuDepart(String stuDepart) {
    this.stuDepart = stuDepart;
  }

  public String getStuNum() {
    return this.stuNum;
  }

  public void setStuNum(String stuNum) {
    this.stuNum = stuNum;
  }

  public double getStuGrade() {
    return this.stuGrade;
  }

  public void setStuGrade(double stuGrade) {
    this.stuGrade = stuGrade;
  }
}

public class Practice05 {

  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    ArrayList<Student> students = new ArrayList<>();

    while (true) {
      Student stu = new Student();
      System.out.print(
        "학생 이름, 학과, 학번, 학점평균 입력 (학생 이름에 '그만' 적으면 종료) >>>> "
      );
      String stuInfo = sc.nextLine();
      String[] stuInfos = stuInfo.split(", ");
      if (stuInfos[0].equals("그만")) break;
      stu.setStuName(stuInfos[0]);
      stu.setStuDepart(stuInfos[1]);
      stu.setStuNum(stuInfos[2]);
      String stuNumStr = stuInfos[3];
      double stuNum = Double.parseDouble(stuNumStr);
      stu.setStuGrade(stuNum);

      students.add(stu);
    }

    System.out.println("----------------------------------------");
    for (int i = 0; i < students.size(); i++) {
      System.out.println("이름 : " + students.get(i).getStuName());
      System.out.println("학과 : " + students.get(i).getStuDepart());
      System.out.println("학번 : " + students.get(i).getStuNum());
      System.out.println("학점평균 : " + students.get(i).getStuGrade());
      System.out.println("----------------------------------------");
    }

    sc.close();
  }
}

HashMap

Map, Entry와 함께 써서 인덱스로 접근하듯 사용할 수도 있다.

01

// Entry 사용
    int count = 0;
    for (Map.Entry<Integer, String> pair : map.entrySet()) {
      if (count % 10 == 0 && count != 0) System.out.println();
      System.out.print(pair.getKey() + ":" + pair.getValue() + "\t");
      count++;
    }
    System.out.println("\n");

    // Iterator 사용
    Iterator<Map.Entry<Integer, String>> itr = map.entrySet().iterator();

02

for (Map.Entry<String, String> pair : nations.entrySet()) {
      System.out.print(pair.getKey() + ":" + pair.getValue() + "\t");
    }

Ex.01

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

public class HashMapEx {

  public static void main(String[] args) {
    // 비교 : 파이썬의 딕셔너리
    HashMap<Integer, String> map = new HashMap<>();

    for (int i = 0; i < 30; i++) {
      map.put(i, "글" + (i + 1));
    }

    for (int i = 0; i < map.size(); i++) {
      if ((i % 10 == 0) && !(i == 0)) System.out.println();
      System.out.print(map.get(i) + "\t");
    }
    System.out.println("\n");

    // Entry 사용
    int count = 0;
    for (Map.Entry<Integer, String> pair : map.entrySet()) {
      if (count % 10 == 0 && count != 0) System.out.println();
      System.out.print(pair.getKey() + ":" + pair.getValue() + "\t");
      count++;
    }
    System.out.println("\n");

    // Iterator 사용
    Iterator<Map.Entry<Integer, String>> itr = map.entrySet().iterator();

    count = 0;
    while (itr.hasNext()) {
      Map.Entry<Integer, String> entry = itr.next();
      if (count % 10 == 0 && count != 0) System.out.println();
      System.out.print(entry.getKey() + ":" + entry.getValue() + "\t");
      count++;
    }
  }
}

Ex.02

Split()으로 풀기

package Practice;

import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

public class Practice07 {

  public static void main(String[] args) {
    HashMap<String, Double> maps = new HashMap<>();
    Scanner sc = new Scanner(System.in);

    for (int i = 0; i < 5; i++) {
      System.out.print("이름, 학점을 입력 (홍길동 4.1) >> ");
      String input = sc.nextLine();
      String[] scholars = input.split(" ");
      Double grade = Double.parseDouble(scholars[1]);
      maps.put(scholars[0], grade);
    }

    //int genius = 0;
    double scholarGrade = 0;
    String scholarName = "";
    for (Map.Entry<String, Double> pair : maps.entrySet()) {
      if (pair.getValue() > scholarGrade) {
        scholarGrade = pair.getValue();
        scholarName = pair.getKey();
      }
    }

    if (scholarGrade < 3.2) {
      System.out.println("기준에 준하는 학생이 없으므로 장학생 선발 유예.");
    } else if (scholarGrade >= 3.2) {
      System.out.println(
        "장학생 명단 : " + scholarName + " (" + scholarGrade + ")"
      );
    }

    sc.close();
  }
}

StringTokenizer로 풀기

package Practice;

import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
import java.util.StringTokenizer;

class ScholarManager {

  HashMap<String, Double> maps = new HashMap<>();
  Scanner sc = new Scanner(System.in);

  public void insertScholar(int num) {
    for (int i = 0; i < num; i++) {
      System.out.print("이름, 학점을 입력 (홍길동 4.1) >> ");
      String input = sc.nextLine();
      StringTokenizer st = new StringTokenizer(input, " ");
      String name = st.nextToken().trim();
      Double grade = Double.parseDouble(st.nextToken().trim());
      maps.put(name, grade);
    }
  }

  public void selectScholar() {
    double scholarGrade = 0;
    String scholarName = "";
    for (Map.Entry<String, Double> pair : maps.entrySet()) {
      if (pair.getValue() > scholarGrade) {
        scholarGrade = pair.getValue();
        scholarName = pair.getKey();
      }
    }

    System.out.print("장학점 기준 >>> ");
    double scholarPoint = sc.nextDouble();

    if (scholarGrade < scholarPoint) {
      System.out.println("기준에 준하는 학생이 없으므로 장학생 선발 유예.");
    } else if (scholarGrade >= scholarPoint) {
      System.out.println(
        "장학생 명단 : " + scholarName + " (" + scholarGrade + ")"
      );
    }
  }
}

public class Practice07 {

  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    ScholarManager sm = new ScholarManager();

    System.out.print("몇 명의 학생이 장학생 판별 대상입니까 (정수입력) >>> ");
    int num = sc.nextInt();
    sm.insertScholar(num);
    sm.selectScholar();
    sc.close();
  }
}

Ex.03

package Practice;

import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

/*** 3번 문제 */
public class Practice03 {

  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    HashMap<String, String> nations = new HashMap<>();

    // 입력해서 HashMap에 넣기
    while (true) {
      System.out.print("나라 이름과 인구 입력 (ex. Korea 5000) >>> ");
      String input = sc.nextLine();

      if (input.equals("그만")) {
        break;
      }

      String[] inputArr = input.split(" ");

      nations.put(inputArr[0], inputArr[1]);
    }

    // 출력하기
    for (Map.Entry<String, String> pair : nations.entrySet()) {
      System.out.print(pair.getKey() + ":" + pair.getValue() + "\t");
    }
    System.out.println("\n");

    // 인구 검색
    while (true) {
      System.out.print("인구 검색 >>> ");
      String searchPop = sc.next();

      if (searchPop.equals("그만")) {
        break;
      }

      if (nations.get(searchPop) != null) {
        System.out.println(searchPop + "의 인구는 " + nations.get(searchPop));
      } else {
        System.out.println(searchPop + "라는 나라는 자료에 없습니다.");
      }
    }

    sc.close();
  }
}

Ex.04

Split()으로 풀기

package Practice;

// 6번 문제

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Scanner;

class Location {

  private String cityName;
  private String latitude;
  private String longitude;

  public String getCityName() {
    return this.cityName;
  }

  public void setCityName(String cityName) {
    this.cityName = cityName;
  }

  public String getLatitude() {
    return this.latitude;
  }

  public void setLatitude(String latitude) {
    this.latitude = latitude;
  }

  public String getLongitude() {
    return this.longitude;
  }

  public void setLongitude(String longitude) {
    this.longitude = longitude;
  }
}

public class Practice06 {

  public static void main(String[] args) {
    HashMap<String, Location> locations = new HashMap<>();
    Scanner sc = new Scanner(System.in);

    for (int i = 0; i < 4; i++) {
      Location lc = new Location();
      System.out.print("도시이름, 위도, 경도를 입력하세요 >>>> ");
      String loca = sc.nextLine();
      String[] location = loca.split(", ");
      lc.setCityName(location[0]);
      lc.setLatitude(location[1]);
      lc.setLongitude(location[2]);
      locations.put(lc.getCityName(), lc);
    }

    Iterator<Map.Entry<String, Location>> iteratorE = locations
      .entrySet()
      .iterator();
    System.out.println("-------------");

    while (iteratorE.hasNext()) {
      Map.Entry<String, Location> entry = (Map.Entry<String, Location>) iteratorE.next();
      String key = entry.getKey();
      Location value = entry.getValue();
      System.out.println(
        key + "\t" + value.getLatitude() + "\t" + value.getLongitude()
      );
    }
    System.out.println("-------------");

    while (true) {
      System.out.print("도시 이름 >>> ");
      String search = sc.next();
      if (search.equals("그만")) break;

      if (locations.containsKey(search)) {
        Location lc = locations.get(search);
        System.out.println(
          lc.getCityName() + "\t" + lc.getLatitude() + "\t" + lc.getLongitude()
        );
      } else {
        System.out.println("그런 나라 없음.");
      }
    }
    sc.close();
  }
}

StringTokenizer로 풀기

package Practice;

// 6번 문제

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Scanner;
import java.util.StringTokenizer;

class Location {

  private String cityName;
  private Double latitude;
  private Double longitude;

  public String getCityName() {
    return this.cityName;
  }

  public void setCityName(String cityName) {
    this.cityName = cityName;
  }

  public Double getLatitude() {
    return this.latitude;
  }

  public void setLatitude(Double latitude) {
    this.latitude = latitude;
  }

  public Double getLongitude() {
    return this.longitude;
  }

  public void setLongitude(Double longitude) {
    this.longitude = longitude;
  }
}

class locationManager {

  Location lc;
  HashMap<String, Location> locations = new HashMap<>();
  Scanner sc = new Scanner(System.in);

  public void insertLocation(int num) {
    for (int i = 0; i < num; i++) {
      lc = new Location();
      System.out.print("도시이름, 위도, 경도를 입력하세요 >>>> ");
      String loca = sc.nextLine();
      //String[] location = loca.split(", ");
      StringTokenizer st = new StringTokenizer(loca, ",");

      String cityName = st.nextToken().trim();
      String latitude = st.nextToken().trim();
      String longitude = st.nextToken().trim();
      lc.setCityName(cityName);
      lc.setLatitude(Double.parseDouble(latitude));
      lc.setLongitude(Double.parseDouble(longitude));
      locations.put(lc.getCityName(), lc);
    }
  }

  public void showAll() {
    Iterator<Map.Entry<String, Location>> iteratorE = locations
      .entrySet()
      .iterator();
    System.out.println("-------------");

    while (iteratorE.hasNext()) {
      Map.Entry<String, Location> entry = (Map.Entry<String, Location>) iteratorE.next();
      String key = entry.getKey();
      Location value = entry.getValue();
      System.out.println(
        key + "\t" + value.getLatitude() + "\t" + value.getLongitude()
      );
    }
    System.out.println("-------------");
  }

  public void showInfo() {
    while (true) {
      System.out.print("도시 이름 >>> ");
      String search = sc.next();
      if (search.equals("그만")) break;

      if (locations.containsKey(search)) {
        Location lc = locations.get(search);
        System.out.println(
          lc.getCityName() + "\t" + lc.getLatitude() + "\t" + lc.getLongitude()
        );
      } else {
        System.out.println("그런 나라 없음.");
      }
    }
  }
}

public class Practice06 {

  public static void main(String[] args) {
    //HashMap<String, Location> locations = new HashMap<>();
    Scanner sc = new Scanner(System.in);
    locationManager lm = new locationManager();

    lm.insertLocation(4);
    lm.showAll();
    lm.showInfo();

    sc.close();
  }
}

yoneeki

Working Abroad ...

이전 포스트

class 14-15 : 자바 (상속, 추상클래스, 인터페이스 등)

다음 포스트

class 16-17 : 자바 (패키지, 클래스, 제네릭, 컬렉션 등)

training-jp

StringBuffer

Math

Calendar

실습

데이터 변형

객체를 배열로 생성

Calendar 응용

Vector

Ex.01

Ex.02

Iterator

ArrayList

Ex.01

Ex.02

HashMap

01

02

Ex.01

Ex.02

Split()으로 풀기

StringTokenizer로 풀기

Ex.03

Ex.04

Split()으로 풀기

StringTokenizer로 풀기

class 14-15 : 자바 (상속, 추상클래스, 인터페이스 등)

class 18-19 : 자바 (파일 읽어오기, 스윙 등)

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