diff --git a/RxJava/practice/src/main/java/org/example/common/Car.java b/RxJava/practice/src/main/java/org/example/common/Car.java
new file mode 100644
index 00000000..339fadf8
--- /dev/null
+++ b/RxJava/practice/src/main/java/org/example/common/Car.java
@@ -0,0 +1,73 @@
+package org.example.common;
+
+public class Car {
+    private CarMaker carMaker;
+    private CarType carType;
+    private String carName;
+    private int carPrice;
+    private boolean isNew;
+
+    public Car(String carName){
+        this.carName = carName;
+    }
+
+    public Car(String carName, CarType carType){
+        this.carName = carName;
+        this.carType = carType;
+    }
+
+    public Car(CarMaker carMaker, String carName, CarType carType, int carPrice){
+        this.carMaker = carMaker;
+        this.carName = carName;
+        this.carType = carType;
+        this.carPrice = carPrice;
+    }
+
+    public Car(CarMaker carMaker, CarType carType, String carName, int carPrice, boolean isNew) {
+        this.carMaker = carMaker;
+        this.carType = carType;
+        this.carName = carName;
+        this.carPrice = carPrice;
+        this.isNew = isNew;
+    }
+
+    public CarMaker getCarMaker() {
+        return carMaker;
+    }
+
+    public void setCarMaker(CarMaker carMaker) {
+        this.carMaker = carMaker;
+    }
+
+    public CarType getCarType() {
+        return carType;
+    }
+
+    public void setCarType(CarType carType) {
+        this.carType = carType;
+    }
+
+    public String getCarName() {
+        return carName;
+    }
+
+    public void setCarName(String carName) {
+        this.carName = carName;
+    }
+
+    public int getCarPrice() {
+        return carPrice;
+    }
+
+    public void setCarPrice(int carPrice) {
+        this.carPrice = carPrice;
+    }
+
+    public boolean isNew() {
+        return isNew;
+    }
+
+    public void setNew(boolean aNew) {
+        isNew = aNew;
+    }
+}
\ No newline at end of file
diff --git a/RxJava/practice/src/main/java/org/example/common/CarFilter.java b/RxJava/practice/src/main/java/org/example/common/CarFilter.java
new file mode 100644
index 00000000..c278dfce
--- /dev/null
+++ b/RxJava/practice/src/main/java/org/example/common/CarFilter.java
@@ -0,0 +1,29 @@
+package org.example.common;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.function.Predicate;
+
+public class CarFilter {
+    // 사용자 정의 Predicate 사용
+    public static List<Car> filterCarByCustomPredicate(List<Car> cars, CarPredicate p) {
+        List<Car> resultCars = new ArrayList<>();
+        for(Car car : cars)
+            if (p.test(car)) {
+                resultCars.add(car);
+            }
+
+        return resultCars;
+    }
+
+    // java.util.function 패키지에 내장된 Predicate 사용
+    public static List<Car> filterCarByBuiltinPredicate(List<Car> cars, Predicate<Car> p) {
+        List<Car> resultCars = new ArrayList<>();
+        for(Car car : cars)
+            if (p.test(car)) {
+                resultCars.add(car);
+            }
+
+        return resultCars;
+    }
+}
\ No newline at end of file
diff --git a/RxJava/practice/src/main/java/org/example/common/CarMaker.java b/RxJava/practice/src/main/java/org/example/common/CarMaker.java
new file mode 100644
index 00000000..15e93d92
--- /dev/null
+++ b/RxJava/practice/src/main/java/org/example/common/CarMaker.java
@@ -0,0 +1,9 @@
+package org.example.common;
+
+public enum CarMaker {
+    HYUNDAE,
+    CHEVROLET,
+    KIA,
+    SSANGYOUNG,
+    SAMSUNG
+}
\ No newline at end of file
diff --git a/RxJava/practice/src/main/java/org/example/common/CarPredicate.java b/RxJava/practice/src/main/java/org/example/common/CarPredicate.java
new file mode 100644
index 00000000..9fb498b2
--- /dev/null
+++ b/RxJava/practice/src/main/java/org/example/common/CarPredicate.java
@@ -0,0 +1,5 @@
+package org.example.common;
+
+public interface CarPredicate {
+    boolean test(Car car);
+}
\ No newline at end of file
diff --git a/RxJava/practice/src/main/java/org/example/common/CarType.java b/RxJava/practice/src/main/java/org/example/common/CarType.java
new file mode 100644
index 00000000..0812a27c
--- /dev/null
+++ b/RxJava/practice/src/main/java/org/example/common/CarType.java
@@ -0,0 +1,7 @@
+package org.example.common;
+
+public enum CarType {
+    SEDAN,
+    SUV,
+    PICKUPTRUK
+}
\ No newline at end of file
diff --git a/RxJava/practice/src/main/java/org/example/common/SampleData.java b/RxJava/practice/src/main/java/org/example/common/SampleData.java
new file mode 100644
index 00000000..77f7a878
--- /dev/null
+++ b/RxJava/practice/src/main/java/org/example/common/SampleData.java
@@ -0,0 +1,94 @@
+package org.example.common;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+
+public class SampleData {
+    public static CarMaker[] carMakersDuplicated = {
+            CarMaker.CHEVROLET,
+            CarMaker.HYUNDAE,
+            CarMaker.SAMSUNG,
+            CarMaker.SSANGYOUNG,
+            CarMaker.CHEVROLET,
+            CarMaker.HYUNDAE,
+            CarMaker.KIA,
+            CarMaker.SSANGYOUNG
+    };
+
+    public static CarMaker[] carMakers = {
+            CarMaker.CHEVROLET,
+            CarMaker.HYUNDAE,
+            CarMaker.SAMSUNG,
+            CarMaker.SSANGYOUNG,
+            CarMaker.KIA
+    };
+
+    public static List<Car> carList =
+            Arrays.asList(
+                    new Car(CarMaker.CHEVROLET, "말리부", CarType.SEDAN, 23_000_000),
+                    new Car(CarMaker.HYUNDAE, "쏘렌토", CarType.SUV, 33_000_000),
+                    new Car(CarMaker.CHEVROLET, "트래버스", CarType.SUV, 50_000_000),
+                    new Car(CarMaker.HYUNDAE, "팰리세이드", CarType.SEDAN, 28_000_000),
+                    new Car(CarMaker.CHEVROLET, "트랙스", CarType.SUV, 18_000_000),
+                    new Car(CarMaker.SSANGYOUNG, "티볼리", CarType.SUV, 23_000_000),
+                    new Car(CarMaker.SAMSUNG, "SM6", CarType.SUV, 40_000_000),
+                    new Car(CarMaker.SSANGYOUNG, "G4렉스턴", CarType.SUV, 43_000_000),
+                    new Car(CarMaker.SAMSUNG, "SM5", CarType.SEDAN, 35_000_000)
+            );
+
+    // A, B, C 구간의 차량 속도 데이터
+    public static final Integer[] speedOfSectionA = {100, 110, 115, 130, 160};
+    public static final Integer[] speedOfSectionB = {85, 90, 100, 110, 105, 113, 125};
+    public static final Integer[] speedOfSectionC = {98, 88, 111, 123, 155, 124, 136, 143};
+
+    // 지점 A의 월별 매출
+    public static final List<Integer> salesOfBranchA = Arrays.asList(
+                15_000_000, 25_000_000, 10_000_000, 35_000_000, 23_000_000, 40_000_000, 50_000_000, 45_000_000,
+                35_000_000, 23_000_000, 15_000_000, 10_000_000
+            );
+
+    // 지점 B의 월별 매출
+    public static final List<Integer> salesOfBranchB = Arrays.asList(
+            11_000_000, 23_000_000, 15_000_000, 32_000_000, 13_000_000, 45_000_000, 55_000_000, 43_000_000,
+            25_000_000, 28_000_000, 19_000_000, 13_000_000
+    );
+
+    // 지점 C의 월별 매출
+    public static final List<Integer> salesOfBranchC = Arrays.asList(
+            12_000_000, 21_000_000, 19_000_000, 33_000_000, 33_000_000, 41_000_000, 52_000_000, 48_000_000,
+            32_000_000, 21_000_000, 18_000_000, 14_000_000
+    );
+
+
+    // 서울의 시간별 미세먼지 농도
+    public static final List<Integer> seoulPM10List = Arrays.asList(
+      45, 30, 68, 70, 100, 110, 120, 90, 80, 60, 50, 60, 70, 80, 100, 150, 140, 130, 170, 130, 90, 86, 67, 50
+    );
+
+    // 부산의 시간별 미세먼지 농도
+    public static final List<Integer> busanPM10List = Arrays.asList(
+            35, 30, 63, 50, 80, 90, 100, 80, 70, 50, 55, 60, 65, 75, 80, 90, 100, 90, 120, 110, 70, 66, 65, 55
+    );
+
+    // 인천의 시간별 미세먼지 농도
+    public static final List<Integer> incheonPM10List = Arrays.asList(
+            55, 40, 73, 70, 85, 99, 120, 85, 75, 73, 80, 70, 95, 95, 100, 120, 110, 120, 140, 120, 100, 125, 135, 125
+    );
+
+    // 1시간 동안 서울의 온도 변화 데이터
+    public static Integer[] temperatureOfSeoul = {10, 13, 14, 12, 11, 9};
+
+    // 1시간 동안 서울의 습도 변화 데이터
+    public static Integer[] humidityOfSeoul = {45, 35, 33, 43, 32, 62};
+
+
+    public static Observable<String> getSpeedPerSection(String section, long interval, final Integer[] speedData){
+        return Observable.interval(interval, TimeUnit.MILLISECONDS)
+                .take(speedData.length)
+                .map(Long::intValue)
+                .map(i -> section + " 지점의 차량 속도: " + speedData[i]);
+    }
+
+
+}
\ No newline at end of file