2주차 Assignment - 정다연

dayeon/advanced-java-assignment/.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

dayeon/advanced-java-assignment/advanced-java-assignment.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>

dayeon/advanced-java-assignment/src/T1/Test1.java

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+package T1;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.NoSuchElementException;
+
+public class Test1 {
+
+    public static List<Integer> list = new ArrayList<>();
+
+    public static void main(String[] args) {
+        list = Arrays.asList(1, 2, 3 ,4, 5 ,6);
+
+        double avg = list.stream()
+                .mapToDouble(Math::sqrt)
+                    .average()
+                        .orElseThrow(NoSuchElementException::new);
+
+        System.out.println(avg);
+    }
+}

dayeon/advanced-java-assignment/src/T2/ArrayProcessing.java

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+package T2;
+
+@FunctionalInterface
+public interface ArrayProcessing {
+    double apply(double[] array);
+}

dayeon/advanced-java-assignment/src/T2/Test2.java

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+package T2;
+
+public class Test2 {
+
+    public static double action(ArrayProcessing arrayProcessing) {
+        double[] array = {1, 2, 3, 4, 5, 6};
+
+        return arrayProcessing.apply(array);
+    }
+
+    public static void main(String[] args) {
+        double ans1 = action((array -> {
+            double max = 0;
+            for (int i = 0; i < array.length; i++) {
+                if (max < array[i]) { max = array[i]; }
+            } return max;
+        }));
+        System.out.println(ans1);
+
+        double ans2 = action((array -> {
+            double result = 0;
+            for (int i = 0; i < array.length; i++) {
+                result += array[i];
+            } return result / array.length;
+        }));
+        System.out.println(ans2);
+    }
+}

dayeon/advanced-java-assignment/src/T3/Test3.java

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+package T3;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+public class Test3 {
+    public static void main(String[] args) throws IOException {
+        int sum = 0;
+
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+        int count = Integer.parseInt(br.readLine());
+        try {
+            String[] strNum = br.readLine().split(" ");
+
+            for (int i = 0; i < count; i++) {
+                sum += Integer.parseInt(strNum[i]);
+            }
+            System.out.println("정수들의 합은 "+sum);
+        } catch (NumberFormatException e) {
+            System.out.println("예외가 발생했습니다!");
+            System.out.println("예외 정보: "+e);
+        }
+        br.close();
+    }
+}

dayeon/database/db-assign.sql

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+CREATE TABLE `Products` (
+	`productid`	VARCHAR(255)	NOT NULL,
+	`name`	TEXT	NULL,
+	`price`	VARCHAR(255)	NULL
+);
+
+CREATE TABLE `Customer` (
+	`custid`	VARCHAR(255)	NOT NULL,
+	`name`	TEXT	NULL,
+	`address`	TEXT	NULL,
+	`phone`	TEXT	NULL
+);
+
+CREATE TABLE `Orders` (
+	`orderid`	VARCHAR(255)	NOT NULL,
+	`orderdate`	DATE	NULL,
+	`productid`	VARCHAR(255)	NOT NULL,
+	`custid`	VARCHAR(255)	NOT NULL
+);
+
+ALTER TABLE `Products` ADD CONSTRAINT `PK_PRODUCTS` PRIMARY KEY (
+	`productid`
+);
+
+ALTER TABLE `Customer` ADD CONSTRAINT `PK_CUSTOMER` PRIMARY KEY (
+	`custid`
+);
+
+ALTER TABLE `Orders` ADD CONSTRAINT `PK_ORDERS` PRIMARY KEY (
+	`orderid`
+);
+
+INSERT INTO customer (custid, name, address, phone)
+VALUES (1, ‘이영지’, ‘서울 송파구’, ‘010-1111-1111’),
+(2, ‘안유진’, ‘서울 중구’, ‘010-2222-2222’),
+(3, ‘미미’, ‘서울 강남구’, ‘010-3333-3333’),
+(4, ‘이은지’, ‘서울 마포구’, ‘010-4444-4444’);
+
+INSERT INTO products (productid, name, price)
+VALUES (1, ‘스티커’, 2000),
+(2, ‘키링’, 3000),
+(3, ‘아크릴스텐드’, 5000),
+(4, ‘인형’, 10000);
+
+INSERT INTO orders (orderid, productid, custid, orderdate)
+VALUES (1, 1, 1, ‘2024-03-05’),
+(2, 2, 2, ‘2024-03-18’),
+(3, 4, 3, ‘2024-04-05’);
+
+SELECT customer.name, products.name, orders.orderdate
+FROM orders
+JOIN products ON products.productid = orders.productid
+JOIN customer ON customer.custid = orders.custid;