[WEEK1] 기본 과제 & 도전 과제

firstClass/basicAssignments/.gitignore

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+### IntelliJ IDEA ###
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

firstClass/basicAssignments/basicAssignments.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

firstClass/basicAssignments/src/Main.java

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+public class Main {
+    public static void main(String[] args) {
+        System.out.println("Hello world!");
+    }
+}

firstClass/basicAssignments/src/abstractMethod.java

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+abstract class Food{ // 부모 클래스 추상화
+
+    abstract public void eat(String name); // 선언은 되어 있으나 구현은 하지 않은 상태
+    abstract public void hate(String food);
+
+    abstract public void count(int food);
+
+    }
+class Eggplant extends Food {		// 추상클래스 Food를 상속받은 자손 클래스
+    @Override
+    public void eat(String name) {			// 오버라이드
+        System.out.println(name + "이 음식을 먹습니다.");
+    }
+    @Override
+    public void hate(String food){
+        System.out.println("으! 아차! 이 음식은" + food + "였네요." );
+    }
+    @Override
+
+    public void count(int food){
+        System.out.println("맛있는건줄 알고 " + food + "개나 먹었어요.");
+    }
+}
+
+
+public class abstractMethod {
+    public static void main(String[] args) {
+        Eggplant eggplant = new Eggplant(); // 인스턴스
+        eggplant.eat("유진");
+        eggplant.hate("가지");
+        eggplant.count(3); // 오버 로딩 같은 food 지만 다른 타입으로 동작
+    }
+}
+

firstClass/basicAssignments/src/generic.java

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+class Test<T>{ // 제네릭 클래스 생성
+    private T value;
+
+    public T get() {
+        return value;
+    }
+    public void set(T value) {
+        this.value = value;
+    }
+
+}
+
+public class generic {
+
+    public static void main(String[] args) {
+        Test<String> StringGeneric = new Test<String>(); // 제네릭 인스턴스 타입을 다르게 생성
+        Test<Integer> IntGeneric = new Test<Integer>();
+
+        StringGeneric.set("어려운것 같아요");
+        String str = StringGeneric.get(); // String 형식
+
+        IntGeneric.set(20);
+        int val = IntGeneric.get(); // Int 형식
+
+        System.out.println("제네릭은 " + str);
+        System.out.println("한 이정도..." + val);
+    }
+
+}

firstClass/basicAssignments/src/interfaceJava.java

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+interface Animal {                  // Animal 인터페이스
+    public abstract void talk();
+
+}
+
+interface Feed {                    // Food 인터페이스
+    public abstract void food(String food);
+    public abstract void cnt(int cnt);
+}
+
+class Hamster implements Animal,Feed { // 인터페이스 다중 상속 가능
+    public String talk = "쥑쥑";
+
+    @Override                           // 인터페이스의 경우 모든 메서드를 무조건 호출
+    public void talk() {
+        System.out.println("햄스터는 " + this.talk);
+    }
+    @Override
+    public void food(String food) {
+        System.out.println("나는 " + food + "를 좋아해");
+    }
+    @Override
+    public void cnt(int cnt) {
+        System.out.println("오늘 " + cnt + "개 먹었어.쥑쥑");
+    }
+}
+public class interfaceJava {
+    public static void main(String[] args) {
+        Hamster hamster = new Hamster();
+        hamster.talk();
+        hamster.food("해바라기씨");
+        hamster.cnt(5);
+    }
+}

firstClass/moreAssignment/.gitignore

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+### IntelliJ IDEA ###
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

firstClass/moreAssignment/moreAssignment.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>