diff --git a/Average.java b/Average.java
deleted file mode 100644
index d1c1539..0000000
--- a/Average.java
+++ /dev/null
@@ -1,16 +0,0 @@
-import java.util.Scanner;
-public class Average {
-    public static void main(String args[]){
-        Scanner scanner = new Scanner(System.in);
-        System.out.println("Hello");
-        double input1;
-        double input2;
-        double input3;
-        double result;
-        input1 = scanner.nextDouble();
-        input2 = scanner.nextDouble();
-        input3 = scanner.nextDouble();
-        result = (input1+input2+input3)/3;
-        System.out.println(result);
-    }
-}
diff --git a/Change.java b/Change.java
deleted file mode 100644
index eed5ccb..0000000
--- a/Change.java
+++ /dev/null
@@ -1,22 +0,0 @@
-public class Change {
-
-    public static void main(String args[]) {
-//1start
-/*
-        String a = "a:b:c:d";
-        char changed[] = a.toCharArray();
-
-        for (int n = 0; n < a.length(); n++) {
-            if (changed[n] == ':') {
-                changed[n] = '#';
-            }
-        }
-*/
-//1end
-// 2start
-        String a = "a:b:c:d";
-        a = a.replace(":", "#");//2end
-        System.out.println(a);//주석을 지우면 a 대신 changed를 넣어도 됨
-
-    }
-}
diff --git a/Entry.java b/Entry.java
new file mode 100644
index 0000000..49b68dd
--- /dev/null
+++ b/Entry.java
@@ -0,0 +1,25 @@
+import java.util.Scanner;
+
+public class Entry {
+    int speed;
+    String name = "";
+
+    public static void main(String args[]) {
+        int entryNumber;
+        Scanner scanner = new Scanner(System.in);
+        System.out.println("참가자 수를 입력하세요.");
+        entryNumber = scanner.nextInt();
+        Entry[] entryArray = new Entry[entryNumber];
+        for (int a = 0; a < entryNumber; a++) {
+            entryArray[a] = new Entry();
+            System.out.println(a + 1 + "번째 참가자의 speed를 입력하세요.");
+            entryArray[a].speed = scanner.nextInt();
+            System.out.println(a + 1 + "번째 참가자의 이름를 입력하세요.");
+            entryArray[a].name = scanner.next();
+        }
+        System.out.println("---------참가자 소개----------");
+        for (int a = 0; a < entryNumber; a++) {
+            System.out.println("speed : " + entryArray[a].speed + "     name : " + entryArray[a].name);
+        }
+    }
+}
diff --git a/IDNumber.java b/IDNumber.java
deleted file mode 100644
index 9bb72a4..0000000
--- a/IDNumber.java
+++ /dev/null
@@ -1,12 +0,0 @@
-import java.util.Scanner;
-
-public class IDNumber {
-    public static void main(String args[]){
-        String iD;
-        String yearMonthDay;//나중에 따로 저장해서 시도해 볼 것
-        Scanner scanner = new Scanner(System.in);
-        iD = scanner.nextLine();
-        System.out.println(iD.substring(0,6));
-        System.out.println(iD.substring(7,14));
-    }
-}
diff --git a/ListToArray.java b/ListToArray.java
deleted file mode 100644
index 080d1ab..0000000
--- a/ListToArray.java
+++ /dev/null
@@ -1,15 +0,0 @@
-import java.util.ArrayList;
-import java.util.Arrays;
-
-public class ListToArray {
-    public static void main(String argc[]){
-
-        ArrayList<String> myList = new ArrayList<>(Arrays.asList("Life", "is", "too", "short"));
-        System.out.println(myList); // [Life, is, too, short] 출력
-        String string = "";
-        for (String item : myList) {
-            string += item + " ";
-        }
-        System.out.println(string);
-    }
-}
diff --git a/ToSet.java b/ToSet.java
deleted file mode 100644
index 45a529e..0000000
--- a/ToSet.java
+++ /dev/null
@@ -1,17 +0,0 @@
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.HashSet;
-import java.util.Set;
-
-public class ToSet {
-    public static void main(String args[]) {
-
-        ArrayList<Integer> numbers = new ArrayList<>(Arrays.asList(1, 1, 1, 2, 2, 3, 3, 3, 4, 4, 5));
-        System.out.println(numbers);  // [1, 1, 1, 2, 2, 3, 3, 3, 4, 4, 5] 출력
-        Set<Integer> objective = new HashSet<>(numbers);
-        System.out.println(objective);
-
-    }
-}
-
-
diff --git a/test1.txt b/test1.txt
deleted file mode 100644
index f13588b..0000000
--- a/test1.txt
+++ /dev/null
@@ -1 +0,0 @@
-asdfasdf