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    ## 과제_1 : 클래스 구조 설계해보기 목표 : 클래스를 만들어보며 클래스의 구조를 이해한다 요구사항 : - `Human`, `Lion`, `Elephant`, `Dolphin`, `Turtle` 5개의 클래스를 만든다. - 5개 클래스는 모두 `age`, `weight` 필드를 가지고 있다. - 생성자를 통해 `age`, `weight`를 초기화한다. - 각 필드는 `private` 접근 제한자를 가지고 있다. - 각 필드 정보를 수정할 수 있는 `getter`, `setter` 메서드를 구현한다. - 5개 클래스는 모두 `public void grow()` 메서드를 가지고 있으며, 해당 메서드를 호출 시 `age`가 `1` 증가한다. - 5개 클래스는 모두 `public void eat()` 메서드를 가지고 있으며, 해당 메서드를 호출 시 `weight`가 `1` 증가한다. - `Human`, `Lion`, `Elephant` 클래스는 `walk()` 메서드를 가지고 있다. - `walk()` 메서드는 `두 발로 걷는다` 또는 `네 발로 걷는다` 라는 메시지를 출력한다. - `Dolphin`, `Turtle` 클래스는 `swim()` 메서드를 가지고 있다. `swim()`메서드를 호출 시 `헤엄!`이라는 메시지를 출력한다. ## 과제_2 : 배열 정렬하기 목표 : 배열을 오름차순으로 정렬하는 코드를 작성한다. 요구사항 : - 표준 입출력으로 배열의 크기를 입력받는다. - 입력받은 크기만큼 정수형 배열을 생성한다. - 배열의 각 요소에 1~100 사이의 난수를 생성하여 저장한다. - **배열의 요소를 오름차순으로 정렬한다.** - 배열의 요소를 출력한다. --- ## 과제_1 : 클래스 구조 설계해보기 모범답안 ```java class Human { private int age; private int weight; public Human(int age, int weight) { this.age = age; this.weight = weight; } public void grow() { this.age++; } public void eat() { this.weight++; } public int getAge() { return this.age; } public int getWeight() { return this.weight; } public void setAge(int age) { this.age = age; } public void setWeight(int weight) { this.weight = weight; } public void walk() { System.out.println("두 발로 걷는다"); } } class Lion { private int age; private int weight; public Lion(int age, int weight) { this.age = age; this.weight = weight; } public void grow() { this.age++; } public void eat() { this.weight++; } public int getAge() { return this.age; } public int getWeight() { return this.weight; } public void setAge(int age) { this.age = age; } public void setWeight(int weight) { this.weight = weight; } public void walk() { System.out.println("네 발로 걷는다"); } } class Elephant { private int age; private int weight; public Elephant(int age, int weight) { this.age = age; this.weight = weight; } public void grow() { this.age++; } public void eat() { this.weight++; } public int getAge() { return this.age; } public int getWeight() { return this.weight; } public void setAge(int age) { this.age = age; } public void setWeight(int weight) { this.weight = weight; } public void walk() { System.out.println("네 발로 걷는다"); } } class Dolphin { private int age; private int weight; public Dolphin(int age, int weight) { this.age = age; this.weight = weight; } public void grow() { this.age++; } public void eat() { this.weight++; } public int getAge() { return this.age; } public int getWeight() { return this.weight; } public void setAge(int age) { this.age = age; } public void setWeight(int weight) { this.weight = weight; } public void swim() { System.out.println("헤엄!"); } } class Turtle { private int age; private int weight; public Turtle(int age, int weight) { this.age = age; this.weight = weight; } public void grow() { this.age++; } public void eat() { this.weight++; } public int getAge() { return this.age; } public int getWeight() { return this.weight; } public void setAge(int age) { this.age = age; } public void setWeight(int weight) { this.weight = weight; } public void swim() { System.out.println("헤엄!"); } } ``` ## 과제_2 : 배열 정렬하기 모범답안 ```java import java.util.Arrays; public class SortArray { public static void main(String[] args) { int[] numbers = { 3, 1, 9, 7, 5 }; for (int i = 0; i < numbers.length - 1; i++) { for (int j = 0; j < numbers.length - i - 1; j++) { if (numbers[j] > numbers[j + 1]) { int temp = numbers[j]; numbers[j] = numbers[j + 1]; numbers[j + 1] = temp; } } } System.out.println(Arrays.toString(numbers)); } } ``` > 사용된 알고리즘 : 버블 정렬 --- ### 버블 정렬 ```java // bubbleSort 메서드 public static void bubbleSort(int[] array) { int n = array.length; for (int i = 0; i < n - 1; i++) { for (int j = 0; j < n - i - 1; j++) { if (array[j] > array[j + 1]) { int temp = array[j]; array[j] = array[j + 1]; array[j + 1] = temp; } } } } ```

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