영상
문제
package 배열9_개념;
import java.util.Arrays;
import java.util.Scanner;
public class 배열9_개념16_이차원배열컨트롤러_문제 {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
// 번호, id, pw
int[] test1 = { 1001, 1234, 1111 };
int[] test2 = { 1002, 2345, 2222 };
int[] test3 = { 1003, 3456, 3333 };
int[] test4 = { 1004, 4567, 4444 };
int[][] memberList = new int[100][3]; // 최대100명 데이터는3
int count = 0;
int lastNumber = 1000;
memberList[count] = test1;
lastNumber += 1;
count += 1;
memberList[count] = test2;
lastNumber += 1;
count += 1;
memberList[count] = test3;
lastNumber += 1;
count += 1;
memberList[count] = test4;
lastNumber += 1;
count += 1;
while (true) {
System.out.println("[회원관리]");
System.out.println("[1] 추가 [2] 삭제 [3] 수정 [4] 검색 [5] 출력 [0] 종료");
int sel = scan.nextInt();
if (sel == 0) {
break;
} else if (sel == 1) {
System.out.print("[추가]번호 입력 : ");
int id = scan.nextInt();
// 아이디 중복검사
int index = -1;
for (int i = 0; i < count; i++) {
if(memberList[i][1] == id) {
index = i;
break;
}
}
if (index == -1) {
System.out.print("[추가]비밀번호 입력 : ");
int pw = scan.nextInt();
int[] data = new int[3];
lastNumber += 1;
data[0] = lastNumber;
data[1] = id;
data[2] = pw;
memberList[count] = data;
count += 1;
} else {
System.out.println("중복 아이디입니다. ");
}
} else if (sel == 2) {
} else if (sel == 3) {
} else if (sel == 4) {
} else if (sel == 5) {
}
}
scan.close();
}
}
Java
복사
해설
package 배열9_개념;
import java.util.Arrays;
import java.util.Scanner;
public class 배열9_개념16_이차원배열컨트롤러_정답 {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
// 번호, id, pw
int[] test1 = { 1001, 1234, 1111 };
int[] test2 = { 1002, 2345, 2222 };
int[] test3 = { 1003, 3456, 3333 };
int[] test4 = { 1004, 4567, 4444 };
int[][] memberList = new int[100][3]; // 최대100명 데이터는3
int count = 0;
int lastNumber = 1000;
memberList[count] = test1;
lastNumber += 1;
count += 1;
memberList[count] = test2;
lastNumber += 1;
count += 1;
memberList[count] = test3;
lastNumber += 1;
count += 1;
memberList[count] = test4;
lastNumber += 1;
count += 1;
while (true) {
for(int i=0; i<count; i++) {
System.out.println(Arrays.toString(memberList[i]));
}
System.out.println("[회원관리]");
System.out.println("[1] 추가 [2] 삭제 [3] 수정 [4] 검색 [5] 출력 [0] 종료");
int sel = scan.nextInt();
if (sel == 0) {
break;
} else if (sel == 1) {
System.out.print("[추가]아이디 입력 : ");
int id = scan.nextInt();
// 아이디 중복검사
int index = -1;
for (int i = 0; i < count; i++) {
if(memberList[i][1] == id) {
index = i;
break;
}
}
if (index == -1) {
System.out.print("[추가]비밀번호 입력 : ");
int pw = scan.nextInt();
int[] data = new int[3];
lastNumber += 1;
data[0] = lastNumber;
data[1] = id;
data[2] = pw;
memberList[count] = data;
count += 1;
} else {
System.out.println("중복 아이디입니다. ");
}
} else if (sel == 2) {
System.out.print("[삭제]아이디 입력 : ");
int id = scan.nextInt();
// 아이디 유효성검사
int index = -1;
for (int i = 0; i < count; i++) {
if(memberList[i][1] == id) {
index = i;
break;
}
}
if(index == -1) {
System.out.println("아이디를 확인해주세요.");
} else {
for(int i=index; i<count-1; i++) {
memberList[i] = memberList[i + 1];
// memberList[i][0] = memberList[i + 1][0];
// memberList[i][1] = memberList[i + 1][1];
// memberList[i][2] = memberList[i + 1][2];
}
count -= 1;
}
} else if (sel == 3) {
System.out.print("[수정]아이디 입력 : ");
int id = scan.nextInt();
// 아이디 유효성검사
int index = -1;
for (int i = 0; i < count; i++) {
if(memberList[i][1] == id) {
index = i;
break;
}
}
if(index == -1) {
System.out.println("아이디를 확인해주세요.");
} else {
System.out.print("[수정]변경할 비밀번호 입력 : ");
int newPw = scan.nextInt();
memberList[index][2] = newPw;
}
} else if (sel == 4) {
System.out.print("[검색]아이디 입력 : ");
int id = scan.nextInt();
// 아이디 유효성검사
int index = -1;
for (int i = 0; i < count; i++) {
if(memberList[i][1] == id) {
index = i;
break;
}
}
if(index == -1) {
System.out.println("아이디를 확인해주세요.");
} else {
System.out.println("NO : " + memberList[index][0]);
System.out.println("ID : " + memberList[index][1]);
System.out.println("PW : " + memberList[index][2]);
}
} else if (sel == 5) {
for(int i=0; i<count; i++) {
System.out.printf("No : %d\tID : %d\tPW : %d\n", memberList[i][0], memberList[i][1], memberList[i][2]);
}
System.out.println();
}
}
scan.close();
}
}
Java
복사
package 배열9_개념;
public class 배열9_개념16_이차원배열컨트롤러_연습예제 {
public static void main(String[] args) {
int[][] arr = {
{ 1001, 1234, 1111 },
{ 1002, 2345, 2222 },
{ 1003, 3456, 3333 },
{ 1004, 4567, 4444 }
};
int count = 4;
int index = 2;
for(int i=index; i<count - 1; i++) {
arr[i] = arr[i + 1];
}
count -= 1;
}
}
JavaScript
복사