KNU-HAEDAL · moozeh · Feb 26, 2025
diff --git a/java_test/a.java b/java_test/a.java
@@ -1,10 +1,14 @@
 package java_test;
 
+import java.util.Scanner;
+
 public class a {
     public static void main(String[] args) {
-
         // 이 부분에 code를 작성해주세요!
 
+        var sc = new Scanner(System.in);
+        System.out.println(new StringBuilder(String.valueOf(sc.nextInt())).reverse());
+        sc.close();
     }
 
 }
diff --git a/java_test/b.java b/java_test/b.java
@@ -1,10 +1,21 @@
 package java_test;
 
+import java.util.Scanner;
+
 public class b {
     public static void main(String[] args) {
 
         // 이 부분에 code를 작성해주세요!
-
+        var sc = new Scanner(System.in);
+        for (char t : sc.nextLine().toCharArray()) {
+            if (t == 'a' || t == 'e' || t == 'i' || t == 'o' || t == 'u') {
+                System.out.println('O');
+                sc.close();
+                return;
+            }
+        }
+        System.out.println('X');
+        sc.close();
     }
 
 }
diff --git a/java_test/c.java b/java_test/c.java
@@ -1,10 +1,23 @@
 package java_test;
 
+import java.util.Scanner;
+
 public class c {
     public static void main(String[] args) {
 
         // 이 부분에 code를 작성해주세요!
+        var sc = new Scanner(System.in);
+
+        var age = sc.nextInt();
+        var height = sc.nextInt();
+        sc.close();
+
+        if (age >= 14 || height >= 155) {
+            System.out.println('X');
+            return;
+        }
 
+        System.out.println('O');
     }
 
 }
diff --git a/java_test/d.java b/java_test/d.java
@@ -1,10 +1,22 @@
 package java_test;
 
+import java.util.Scanner;
+
 public class d {
     public static void main(String[] args) {
 
         // 이 부분에 code를 작성해주세요!
+        var sc = new Scanner(System.in);
+        long n = 0;
+        n = sc.nextLong();
+        sc.close();
+
+        if (n < 1) {
+            System.out.println('X');
+            return;
+        }
 
+        System.out.println(n * (n + 1) / 2);
     }
 
 }
diff --git a/java_test/e.java b/java_test/e.java
@@ -1,10 +1,27 @@
 package java_test;
 
+import java.util.Scanner;
+
 public class e {
     public static void main(String[] args) {
 
         // 이 부분에 code를 작성해주세요!
+        var sc = new Scanner(System.in);
+        int year = sc.nextInt();
+        int month = sc.nextInt();
+        sc.close();
 
+        if (month == 2) {
+            if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0)
+                System.out.println(29);
+            else
+                System.out.println(28);
+        } else {
+            if (month == 4 || month == 6 || month == 9 || month == 11)
+                System.out.println(30);
+            else
+                System.out.println(31);
+        }
     }
 
 }
diff --git a/java_test/f.java b/java_test/f.java
@@ -1,12 +1,30 @@
 package java_test;
 
+import java.util.Scanner;
+
 // 이부분에 class 선언 해도 괜찮습니다
 
 public class f {
     public static void main(String[] args) {
 
         // 이 부분에 code를 작성해주세요!
-
+        var sc = new Scanner(System.in);
+        int n = sc.nextInt();
+        sc.close();
+        for (int i = 1; i <= n; ++i) {
+            for (int j = 0; j < n - i; ++j)
+                System.out.print(' ');
+            for (int j = 0; j < 2 * i - 1; ++j)
+                System.out.print('*');
+            System.out.println();
+        }
+        for (int i = 1; i < n; ++i) {
+            for (int j = 0; j < i; ++j)
+                System.out.print(' ');
+            for (int j = 0; j < 2 * (n - i) - 1; ++j)
+                System.out.print('*');
+            System.out.println();
+        }
     }
 
 }
diff --git a/java_test/g1.java b/java_test/g1.java
@@ -1,12 +1,51 @@
 package java_test;
 
+import java.util.Scanner;
+
 // 이부분에 class 선언 해도 괜찮습니다
 
+class Fan {
+    private char model;
+    private int price;
+
+    public void setModel(char model) {
+        this.model = model;
+    }
+
+    public void setPrice(int price) {
+        this.price = price;
+    }
+
+    public char getModel() {
+        return model;
+    }
+
+    public int getPrice() {
+        return price;
+    }
+
+    public Fan compare(Fan fan) {
+        return this.getPrice() < fan.getPrice() ? this : fan;
+    }
+}
+
 public class g1 {
     public static void main(String[] args) {
 
         // 이 부분에 code를 작성해주세요!
-
+        var sc = new Scanner(System.in);
+        Fan cheapest = new Fan();
+        cheapest.setPrice(1001);
+        for (int i = 0; i < 3; ++i) {
+            char model = sc.next().charAt(0);
+            int price = sc.nextInt();
+            Fan fan = new Fan();
+            fan.setModel(model);
+            fan.setPrice(price);
+            cheapest = cheapest.compare(fan);
+        }
+        sc.close();
+        System.out.println(cheapest.getModel());
     }
 
 }
diff --git a/java_test/g2.java b/java_test/g2.java
@@ -1,12 +1,120 @@
 package java_test;
 
+import java.util.Scanner;
+
 // 이부분에 class 선언 해도 괜찮습니다
+abstract class Book {
+    private String title;
+    private int price;
+    private double rating;
+
+    public double getRating() {
+        return rating;
+    }
+
+    public Book(String title, int price, double rating) {
+        this.title = title;
+        this.price = price;
+        this.rating = rating;
+    }
+
+    public void printData() {
+        System.out.println("Highest rated book information:");
+        System.out.println("Title: " + title);
+        System.out.println("Price: " + price);
+        System.out.println("Rating: " + rating);
+    }
+
+    public Book compareHigherRating(Book other) {
+        return rating < other.getRating() ? other : this;
+    }
+}
+
+class EBook extends Book {
+    private int fileSize;
+
+    public EBook(String title, int price, double rating, int fileSize) {
+        super(title, price, rating);
+        this.fileSize = fileSize;
+    }
+
+    @Override
+    public void printData() {
+        super.printData();
+        System.out.println("File Size: " + fileSize);
+    }
+}
+
+class PrintedBook extends Book {
+    private int pageCount;
+
+    public PrintedBook(String title, int price, double rating, int pageCount) {
+        super(title, price, rating);
+        this.pageCount = pageCount;
+    }
+
+    @Override
+    public void printData() {
+        super.printData();
+        System.out.println("Page Count: " + pageCount);
+    }
+}
+
+class BookManager {
+    Book highest;
+
+    public void scanBook(Scanner input) {
+        while (true) {
+            String type = input.nextLine();
+
+            if (!EBook.class.getSimpleName().equals(type) &&
+                    !PrintedBook.class.getSimpleName().equals(type)) {
+                System.out.println("Invalid book type. Please enter 'EBook' or 'PrintedBook'.");
+                continue;
+            }
+
+            try {
+                String title = input.nextLine();
+                int price = Integer.parseInt(input.nextLine());
+                double rating = Double.parseDouble(input.nextLine());
+                int other = Integer.parseInt(input.nextLine());
+
+                if (EBook.class.getSimpleName().equals(type))
+                    this.compare(new EBook(title, price, rating, other));
+
+                if (PrintedBook.class.getSimpleName().equals(type))
+                    this.compare(new PrintedBook(title, price, rating, other));
+                break;
+
+            } catch (NumberFormatException e) {
+                System.out.println("잘못된 입력입니다. 처음부터 다시 입력하세요.");
+                continue;
+            }
+        }
+    }
+
+    public Book getHighest() {
+        return highest;
+    }
+
+    public void compare(Book book) {
+        if (highest == null)
+            highest = book;
+        else
+            highest = highest.compareHigherRating(book);
+    }
+}
 
 public class g2 {
     public static void main(String[] args) {
 
         // 이 부분에 code를 작성해주세요!
-
+        var sc = new Scanner(System.in);
+        BookManager bookManager = new BookManager();
+        for (int i = 0; i < 3; ++i)
+            bookManager.scanBook(sc);
+        sc.close();
+        bookManager.getHighest().printData();
     }
 
 }