diff --git a/src/main/java/com/ohgiraffers/chap01/section01/literal/Application01.java b/src/main/java/com/ohgiraffers/chap01/section01/literal/Application01.java
index f1c5726..bde01a3 100644
--- a/src/main/java/com/ohgiraffers/chap01/section01/literal/Application01.java
+++ b/src/main/java/com/ohgiraffers/chap01/section01/literal/Application01.java
@@ -4,5 +4,7 @@ public class Application01 {
     public static void main(String[] args){
         // 즐거운 자바를 화면에 출력해주세요
         // 출력예시) 즐거운 자바
+
+        System.out.println("즐거운 자바");
     }
 }
diff --git a/src/main/java/com/ohgiraffers/chap01/section02/variable/Application01.java b/src/main/java/com/ohgiraffers/chap01/section02/variable/Application01.java
index 24b2bfb..d4a91bb 100644
--- a/src/main/java/com/ohgiraffers/chap01/section02/variable/Application01.java
+++ b/src/main/java/com/ohgiraffers/chap01/section02/variable/Application01.java
@@ -4,6 +4,9 @@ public class Application01 {
     public static void main(String[] args){
         // point 변수에 10의 값을 할당하고 화면에 출력해주세요
         // 출력 예시) 10
-        System.out.println(10);
+
+
+        int number = 10;
+        System.out.println(number);
     }
 }
diff --git a/src/main/java/com/ohgiraffers/chap02/section01/arithmetic/Application01.java b/src/main/java/com/ohgiraffers/chap02/section01/arithmetic/Application01.java
index d49b865..8f4d892 100644
--- a/src/main/java/com/ohgiraffers/chap02/section01/arithmetic/Application01.java
+++ b/src/main/java/com/ohgiraffers/chap02/section01/arithmetic/Application01.java
@@ -1,27 +1,53 @@
 package com.ohgiraffers.chap02.section01.arithmetic;
 
+import org.w3c.dom.ls.LSOutput;
+
 public class Application01 {
+    public static void main(String[] args) {
+
+
+        int x = 10;
+        int y = 20;
+        long x2 = 12345678l;
+        long y2 = 12345679l;
+        double num1 = 5;
+        double num2 = 10;
+
+        Application01 app1 = new Application01();
+        int result = app1.plus(x, y);
+        System.out.println(result);
+
+        int result1 = app1.minus(x,y);
+        System.out.println(result1);
+
+        long result2 = app1.multiply(x2,y2);
+        System.out.println(result2);
+
+        double result3 =app1.divide(num1,num2);
+        System.out.println(result3);
+    }
 
     // x, y를 더하는 기능을 만들고 결과를 반환해주세요
     public int plus (int x , int y){
-       return 0;
+        int result = x+y;
+        return result;
     }
 
     // x,y를 빼는 기능을 만들고 결과를 반환해주세요
     public int minus(int x, int y){
-
-        return 0;
+        int result1 = x-y;
+        return result1;
     }
 
     // x,y를 곱하는 기능을 만들고 결과를 반환해주세요
-    public long multiply(int x, int y){
-
-        return  0;
+    public long multiply(long x2, long y2){
+        long result2 =x2*y2;
+        return  result2;
     }
     // x, y를 나누고 결과를 반환해주세요
 
-    public double divide(int x, int y){
-
-        return  0.0;
+    public double divide(double num1, double num2){
+        double result3 =num1/num2;
+        return  result3;
     }
-}
+}
\ No newline at end of file
diff --git a/src/main/java/com/ohgiraffers/chap02/section01/comparsion/Application01.java b/src/main/java/com/ohgiraffers/chap02/section01/comparsion/Application01.java
index 520f31e..0a21cb8 100644
--- a/src/main/java/com/ohgiraffers/chap02/section01/comparsion/Application01.java
+++ b/src/main/java/com/ohgiraffers/chap02/section01/comparsion/Application01.java
@@ -1,21 +1,35 @@
 package com.ohgiraffers.chap02.section01.comparsion;
 
 public class Application01 {
+    public static void main(String[] args) {
+
+        Application01 app1 =new Application01();
+
+        int x = 10;
+        int y = 10;
+
+        boolean result =app1.valueCheck(x,y);
+        System.out.println(result);
+    }
 
     // 두 수의 값을 비교하여 같으면 true 다르면 false를 출력하는 프로그램을 작성해주세요
     public boolean valueCheck(int x, int y){
 
-        return true;
+        return (x == y)? true : false;
+
     }
 
     // 두 수의 값을 비교하여 큰 값을 반환하는 프로그램을 작성해주세요
     // 만약 같다면 0의 값을 반환합니다.
     public int maxNumberOf(int x, int y){
-        return  0;
+
+        return (x==y)?0:(x>y)?x:y;
     }
 
     // int x의 값이 0  ~ 100 사이의 값이 맞다면 true 아니면 false를 출력하는 프로그램을 만들어주세요
+
     public boolean rangeNum(int x){
-        return false;
+
+        return (x>=0 && x<100)? true:false;
     }
-}
+}
\ No newline at end of file