diff --git a/Thread/src/main/java/com/nhnacademy/parkminsu/assignment/Consumer.java b/Thread/src/main/java/com/nhnacademy/parkminsu/assignment/Consumer.java
new file mode 100644
index 0000000..42a0954
--- /dev/null
+++ b/Thread/src/main/java/com/nhnacademy/parkminsu/assignment/Consumer.java
@@ -0,0 +1,58 @@
+package com.nhnacademy.parkminsu.assignment;
+
+import java.util.Random;
+import java.util.concurrent.ThreadLocalRandom;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+public class Consumer implements Runnable {
+    private Mart mart;
+    private Thread thread;
+    private AtomicBoolean isCheck;
+
+    private int buyItem;
+
+    public Consumer(Mart mart, String name) {
+        this.mart = mart;
+        this.thread = new Thread(this, name);
+        this.isCheck = new AtomicBoolean(false);
+    }
+
+    public void start() {
+        thread.start();
+    }
+
+    public void stop() {
+        thread.interrupt();
+    }
+
+    public void join() throws InterruptedException {
+        thread.join();
+    }
+
+    public Thread getThread() {
+        return thread;
+    }
+
+
+    @Override
+    public void run() {
+        getBuyItem();
+        this.mart.enterStore(buyItem);
+        try {
+            Thread.sleep(ThreadLocalRandom.current().nextInt(1000, 10000));
+            this.mart.sellStoreItem(buyItem);
+            System.out.println(thread.getName() + "가 구매했습니다");
+            isCheck.set(true);
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+            System.out.println(e.getMessage());
+
+        }
+        this.mart.exitStore(buyItem);
+    }
+
+    private void getBuyItem() {
+        Random random = new Random();
+        this.buyItem = random.nextInt(this.mart.getStore().length);
+    }
+}
diff --git a/Thread/src/main/java/com/nhnacademy/parkminsu/assignment/Main.java b/Thread/src/main/java/com/nhnacademy/parkminsu/assignment/Main.java
new file mode 100644
index 0000000..4267dd8
--- /dev/null
+++ b/Thread/src/main/java/com/nhnacademy/parkminsu/assignment/Main.java
@@ -0,0 +1,29 @@
+package com.nhnacademy.parkminsu.assignment;
+
+
+import com.nhnacademy.parkminsu.assignment.exception.NegativeNumException;
+
+import java.util.concurrent.ThreadLocalRandom;
+
+
+public class Main {
+    public static void main(String[] args) {
+        try {
+            Mart mart = new Mart(5);
+            String name = "손님";
+            int loop = 1;
+
+            Producer producer = new Producer(mart);
+            producer.start();
+
+            while (true) {
+                Consumer consumer = new Consumer(mart, name + loop);
+                consumer.start();
+                loop += 1;
+                Thread.sleep(ThreadLocalRandom.current().nextInt(1000, 10000));
+            }
+        } catch (NegativeNumException | InterruptedException e) {
+            System.out.println(e.getMessage());
+        }
+    }
+}
diff --git a/Thread/src/main/java/com/nhnacademy/parkminsu/assignment/Mart.java b/Thread/src/main/java/com/nhnacademy/parkminsu/assignment/Mart.java
new file mode 100644
index 0000000..d85aa61
--- /dev/null
+++ b/Thread/src/main/java/com/nhnacademy/parkminsu/assignment/Mart.java
@@ -0,0 +1,55 @@
+package com.nhnacademy.parkminsu.assignment;
+
+
+import com.nhnacademy.parkminsu.assignment.exception.NegativeNumException;
+
+public class Mart {
+    private Store[] store;
+    private int storeNum;
+
+    public Mart(int storeNum) throws NegativeNumException {
+        isCheckNegativeNum(storeNum);
+        this.storeNum = storeNum;
+        initStore();
+    }
+
+    private void initStore() {
+        this.store = new Store[this.storeNum];
+        String str = "store";
+        for (int i = 0; i < store.length; i++) {
+            this.store[i] = new Store(str + i);
+        }
+    }
+
+    private void isCheckNegativeNum(int num) throws NegativeNumException {
+        if (isNegativeNum(num)) {
+            throw new NegativeNumException("음수를 입력하셨습니다");
+        }
+    }
+
+    private boolean isNegativeNum(int num) {
+        return num < 0;
+    }
+
+    public Store[] getStore() {
+        return store;
+    }
+
+    public void enterStore(int buyItemStore) {
+        System.out.println(buyItemStore + "번 째 마트에 입장했습니다");
+        store[buyItemStore].enter();
+    }
+
+    public void sellStoreItem(int buyItemStore) {
+        store[buyItemStore].sell();
+    }
+
+    public void exitStore(int storeNum) {
+        store[storeNum].exit();
+    }
+
+    public void buyStore(int storeNum) {
+        System.out.println("공급자가 " + storeNum + "매장에 들어갔습니다");
+        store[storeNum].buy();
+    }
+}
diff --git a/Thread/src/main/java/com/nhnacademy/parkminsu/assignment/Producer.java b/Thread/src/main/java/com/nhnacademy/parkminsu/assignment/Producer.java
new file mode 100644
index 0000000..4c44be5
--- /dev/null
+++ b/Thread/src/main/java/com/nhnacademy/parkminsu/assignment/Producer.java
@@ -0,0 +1,49 @@
+package com.nhnacademy.parkminsu.assignment;
+
+import java.util.Random;
+import java.util.concurrent.ThreadLocalRandom;
+
+/**
+ * N개의 품목을 납품할 수 있음
+ */
+public class Producer implements Runnable {
+    private Mart mart;
+    Thread thread;
+    private int productItem;
+
+    public Producer(Mart mart) {
+        this.mart = mart;
+        thread = new Thread(this);
+    }
+
+    public void start() {
+        thread.start();
+    }
+
+    public void stop() {
+        thread.interrupt();
+    }
+
+    public void join() throws InterruptedException {
+        thread.join();
+    }
+
+    @Override
+    public void run() {
+        while (!Thread.interrupted()) {
+            try {
+                produceGood();
+                Thread.sleep(ThreadLocalRandom.current().nextInt(1_000, 10_000));
+                mart.buyStore(productItem);
+            } catch (InterruptedException e) {
+                Thread.currentThread().interrupt();
+                System.out.println(e.getMessage());
+            }
+        }
+    }
+
+    public void produceGood() {
+        Random random = new Random();
+        this.productItem = random.nextInt(mart.getStore().length);
+    }
+}
diff --git a/Thread/src/main/java/com/nhnacademy/parkminsu/assignment/Store.java b/Thread/src/main/java/com/nhnacademy/parkminsu/assignment/Store.java
new file mode 100644
index 0000000..0e3d93c
--- /dev/null
+++ b/Thread/src/main/java/com/nhnacademy/parkminsu/assignment/Store.java
@@ -0,0 +1,94 @@
+package com.nhnacademy.parkminsu.assignment;
+
+import java.util.concurrent.Semaphore;
+import java.util.concurrent.atomic.AtomicInteger;
+
+/**
+ * 마트에서는 N개의 품목 매장
+ * 생산자가 품목을 납품하기 전까지 어떤 품목인지는 알 수 없음
+ * 소비자는 품목별로 매장을 이용할 수 있음
+ */
+public class Store {
+
+    private AtomicInteger items;
+    private AtomicInteger currentPeople;
+    private final String name;
+    private final int storeMaxPeople = 5;
+
+    private final Semaphore semaphore;
+
+    public Store(String name) {
+        this.name = name;
+        this.items = new AtomicInteger(0);
+        this.currentPeople = new AtomicInteger(0);
+        this.semaphore = new Semaphore(storeMaxPeople);
+    }
+
+    /**
+     * 매장에 사람이 들어오면 count + 1해줌
+     */
+    public void enter() {
+        try {
+            this.semaphore.acquire();// +1 5명 자동 lock
+            System.out.println("\n" + this.name + " 매장에 손님이 들어왔습니다");
+            this.currentPeople.addAndGet(1); // 손님이 들어오면 +1
+            System.out.println(this.name + " 매장 손님의 수: " + currentPeople + "\n");
+
+        } catch (InterruptedException e) {
+            System.out.println(e.getMessage());
+        }
+
+    }
+
+    public void exit() {
+        semaphore.release();// -1
+        currentPeople.addAndGet(-1);
+        System.out.println();
+        System.out.println(this.name + "매장에 손님이 나갔습니다");
+        System.out.println();
+
+    }
+
+    public synchronized void buy() { // 공급자한테 마트가 삼
+        while (items.get() > 10) {
+            try {
+                System.out.println();
+                System.out.println(this.name + "매장에 물품이 많습니다");
+                System.out.println();
+                wait();
+            } catch (InterruptedException e) {
+                System.out.println(e.getMessage());
+                Thread.currentThread().interrupt();
+            }
+        }
+        if (items.get() <= 0) {
+            notifyAll();
+        }
+        items.addAndGet(1);
+        System.out.println();
+        System.out.println(this.name + "매장에 물품을 추가했습니다");
+        System.out.println(this.name + "매장 현재 물품 수: " + items.get());
+        System.out.println();
+
+
+    }
+
+    public synchronized void sell() { // 소비자 파는거
+        while (items.get() <= 0) {// 물품이 없을 때
+            try {
+                System.out.println();
+                System.out.println(this.name + "매장에 물품이 없습니다");
+                System.out.println();
+                wait();
+            } catch (InterruptedException e) {
+                Thread.currentThread().interrupt();
+            }
+        }
+        notifyAll();
+        items.addAndGet(-1); // -1
+        System.out.println(this.name + "매장에 현재 남은 물품: " + items.get());
+        System.out.println();
+    }
+
+
+}
diff --git a/Thread/src/main/java/com/nhnacademy/parkminsu/assignment/exception/NegativeNumException.java b/Thread/src/main/java/com/nhnacademy/parkminsu/assignment/exception/NegativeNumException.java
new file mode 100644
index 0000000..4229c53
--- /dev/null
+++ b/Thread/src/main/java/com/nhnacademy/parkminsu/assignment/exception/NegativeNumException.java
@@ -0,0 +1,7 @@
+package com.nhnacademy.parkminsu.assignment.exception;
+
+public class NegativeNumException extends Exception {
+    public NegativeNumException(String message) {
+        super(message);
+    }
+}
diff --git a/Thread/src/main/java/com/nhnacademy/parkminsu/exam/Consumer.java b/Thread/src/main/java/com/nhnacademy/parkminsu/exam/Consumer.java
new file mode 100644
index 0000000..91e0981
--- /dev/null
+++ b/Thread/src/main/java/com/nhnacademy/parkminsu/exam/Consumer.java
@@ -0,0 +1,48 @@
+package com.nhnacademy.parkminsu.exam;
+
+import java.util.concurrent.ThreadLocalRandom;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+/**
+ * 소비자는 매장에 입장 후 물건을 구매
+ * 매장에는 입장 인원 제한이 있으므로 인원 초과시 기다림
+ * 매장에 입장하면 물거은 구매하고 퇴장
+ * 1~10초 간격으로 구매
+ */
+public class Consumer implements Runnable {
+    private Store store;
+    private Thread thread;
+    private AtomicBoolean isCheck;
+
+
+    public Consumer(String name, Store store) {
+        this.thread = new Thread(this, name);
+        this.store = store;
+        this.isCheck = new AtomicBoolean(false);
+    }
+
+    public void start() {
+        thread.start();
+    }
+
+    public void stop() {
+        thread.interrupt();
+    }
+
+
+    @Override
+    public void run() {
+        store.enter();
+        try {
+            Thread.sleep(ThreadLocalRandom.current().nextInt(1000, 10000));
+            store.sell();
+            System.out.println(thread.getName() + "가 구매했습니다");
+            isCheck.set(true);
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+            System.out.println(e.getMessage());
+        }
+
+        store.exit();
+    }
+}
diff --git a/Thread/src/main/java/com/nhnacademy/parkminsu/exam/Main.java b/Thread/src/main/java/com/nhnacademy/parkminsu/exam/Main.java
new file mode 100644
index 0000000..2b9e083
--- /dev/null
+++ b/Thread/src/main/java/com/nhnacademy/parkminsu/exam/Main.java
@@ -0,0 +1,23 @@
+package com.nhnacademy.parkminsu.exam;
+
+public class Main {
+    public static void main(String[] args) throws InterruptedException {
+        Store store = new Store();
+        String name = "손님";
+        int loop = 1;
+        Proceducer proceducer = new Proceducer(store);
+        proceducer.start();
+
+        while (true) {
+            Consumer consumer = new Consumer(name + loop, store);
+
+
+            consumer.start();
+            loop += 1;
+            Thread.sleep(1500);
+            //Thread.sleep(ThreadLocalRandom.current().nextInt(1000, 10000));
+
+
+        }
+    }
+}
diff --git a/Thread/src/main/java/com/nhnacademy/parkminsu/exam/Proceducer.java b/Thread/src/main/java/com/nhnacademy/parkminsu/exam/Proceducer.java
new file mode 100644
index 0000000..eb99263
--- /dev/null
+++ b/Thread/src/main/java/com/nhnacademy/parkminsu/exam/Proceducer.java
@@ -0,0 +1,42 @@
+package com.nhnacademy.parkminsu.exam;
+
+import java.util.concurrent.ThreadLocalRandom;
+
+/**
+ * 생산자는 매장에 물건이 부족하지 않도록 채워둠
+ * 물건은 1~10초 간격으로 채움
+ * Thread내에서 난수 생성을 위해서는 ThreadLocalRandom.current().nextInt()
+ * 사용
+ */
+public class Proceducer implements Runnable {
+    private final Store store;
+    private Thread thread;
+
+    public Proceducer(Store store) {
+        this.store = store;
+        thread = new Thread(this);
+    }
+
+    public void start() {
+        thread.start();
+    }
+
+    public void stop() {
+        thread.interrupt();
+    }
+
+    @Override
+    public void run() {
+        try {
+            while (!Thread.interrupted()) {
+                Thread.sleep(ThreadLocalRandom.current().nextInt(1000, 10000));
+                store.buy();
+            }
+        } catch (InterruptedException e) {
+            System.out.println(e.getMessage());
+            Thread.currentThread().interrupt();
+
+        }
+
+    }
+}
diff --git a/Thread/src/main/java/com/nhnacademy/parkminsu/exam/Store.java b/Thread/src/main/java/com/nhnacademy/parkminsu/exam/Store.java
new file mode 100644
index 0000000..850ea5d
--- /dev/null
+++ b/Thread/src/main/java/com/nhnacademy/parkminsu/exam/Store.java
@@ -0,0 +1,90 @@
+package com.nhnacademy.parkminsu.exam;
+
+import java.util.concurrent.Semaphore;
+import java.util.concurrent.atomic.AtomicInteger;
+
+/**
+ * 물건을 납품 받아서 판매
+ * 10개의 물건만 전시
+ * 매장은 최대 5명까지만 동시 입장
+ * 물건 구매는 동시에 1명만 가능
+ * 물건 판매 후 빈 공간에 생기면 생산자에게 알려줌
+ * 물건 납품은 동시에 1명만 가능
+ * 매장에서 물건이 들어오면 소비자에게 알려줌
+ */
+public class Store {
+    private final AtomicInteger consumerCount;
+    private final AtomicInteger thingsCount;
+    private final Semaphore semaphore;
+
+    @SuppressWarnings("checkstyle:MissingJavadocMethod")
+    public Store() {
+        semaphore = new Semaphore(5);
+        consumerCount = new AtomicInteger(0);
+        thingsCount = new AtomicInteger(0);
+    }
+
+    /**
+     * 손님이 들어오면 count가 1 증가
+     */
+    public void enter() {
+        try {
+            semaphore.acquire();
+            consumerCount.addAndGet(1); // +1
+            System.out.println();
+            System.out.println("입장했습니다");
+            System.out.println("사람 수: " + consumerCount.get());
+        } catch (InterruptedException e) {
+            System.out.println(e.getMessage());
+        }
+    }
+
+    /**
+     * 손님이 나가면 count를 1 감소
+     */
+    public void exit() {
+        consumerCount.addAndGet(-1);
+        System.out.println("손님이 나갔습니다");
+        System.out.println();
+        semaphore.release();
+    }
+
+
+    public synchronized void buy() { // 공급자한테 마트가 삼
+        while (thingsCount.get() > 10) {
+            try {
+                System.out.println("물품이 많습니다");
+                wait();
+            } catch (InterruptedException e) {
+                System.out.println(e.getMessage());
+                Thread.currentThread().interrupt();
+            }
+        }
+        thingsCount.addAndGet(1);
+        System.out.println();
+        System.out.println("물품을 추가했습니다");
+        System.out.println("현재 물품 수: " + thingsCount.get());
+        System.out.println();
+
+        notifyAll();
+    }
+
+    public synchronized void sell() { // 소비자 파는거
+        while (thingsCount.get() <= 0) {// 물품이 없을 때
+            try {
+                System.out.println("물품이 없습니다");
+                System.out.println();
+                wait();
+            } catch (InterruptedException e) {
+                Thread.currentThread().interrupt();
+            }
+        }
+        notifyAll();
+        thingsCount.addAndGet(-1); // -1
+        System.out.println("상품을 판매했습니다");
+        System.out.println("현재 남은 물품: " + thingsCount.get());
+        System.out.println();
+
+
+    }
+}