@@ -0,0 +1,23 @@
+package array;
+
+public class ArraryDi0 {
+    public static void main(String[] args) {
+        // 2X3 2차원 배열을 만든다.
+        int [][] arr = new int[2][3]; //행2, 열3
+
+        arr[0][0] = 1; //0행, 0열
+        arr[0][1] = 2; //0행, 1열
+        arr[0][2] = 3; //0행, 2열
+        arr[1][0] = 4; //1행, 0열
+        arr[1][1] = 5; //1행, 1열
+        arr[1][2] = 6; //1행, 2열
+
+        System.out.print(arr[0][0] + " ");
+        System.out.print(arr[0][1] + " ");
+        System.out.print(arr[0][2] + " ");
+        System.out.println();
+        System.out.print(arr[1][0] + " ");
+        System.out.print(arr[1][1] + " ");
+        System.out.print(arr[1][2] + " ");
+    }
+}
@@ -0,0 +1,24 @@
+package array;
+
+public class ArraryDi1 {
+    public static void main(String[] args) {
+        // 2X3 2차원 배열을 만든다.
+        int [][] arr = new int[2][3]; //행2, 열3
+
+        arr[0][0] = 1; //0행, 0열
+        arr[0][1] = 2; //0행, 1열
+        arr[0][2] = 3; //0행, 2열
+        arr[1][0] = 4; //1행, 0열
+        arr[1][1] = 5; //1행, 1열
+        arr[1][2] = 6; //1행, 2열
+
+        for(int row = 0; row < 2; row++) {
+
+            System.out.print(arr[row][0] + " ");
+            System.out.print(arr[row][1] + " ");
+            System.out.print(arr[row][2] + " ");
+            System.out.println();
+        }
+
+    }
+}
@@ -0,0 +1,23 @@
+package array;
+
+public class ArraryDi2 {
+    public static void main(String[] args) {
+        // 2X3 2차원 배열을 만든다.
+        int [][] arr = new int[2][3]; //행2, 열3
+
+        arr[0][0] = 1; //0행, 0열
+        arr[0][1] = 2; //0행, 1열
+        arr[0][2] = 3; //0행, 2열
+        arr[1][0] = 4; //1행, 0열
+        arr[1][1] = 5; //1행, 1열
+        arr[1][2] = 6; //1행, 2열
+
+        for(int row = 0; row < 2; row++) {
+            for(int column = 0; column < 3; column++) {
+                System.out.print(arr[row][column] + " ");
+            }
+            System.out.println();
+        }
+
+    }
+}
@@ -0,0 +1,19 @@
+package array;
+
+public class ArraryDi3 {
+    public static void main(String[] args) {
+        // 2X3 2차원 배열을 만든다.
+        int [][] arr = {
+                {1,2,3,},
+                {4,5,6}
+        };
+
+        for(int row = 0; row < arr.length; row++) {
+            for(int column = 0; column < arr[row].length; column++) {
+                System.out.print(arr[row][column] + " ");
+            }
+            System.out.println();
+        }
+
+    }
+}
@@ -0,0 +1,19 @@
+package array;
+
+public class Array1Ref2 {
+    public static void main(String[] args) { 
+        int[] students; //배열 변수 선언
+        students = new int[5];
+
+        //변수 값 대입
+        students[0] = 90;
+        students[1] = 80;
+        students[2] = 70;
+        students[3] = 60;
+        students[4] = 50;
+
+        for (int i = 0; i < students.length; i++)
+        System.out.println("학생" + (i + 1) + " 점수 : " + students[i]);
+
+    }
+}
@@ -0,0 +1,12 @@
+package array;
+
+public class Array1Ref3 {
+    public static void main(String[] args) { 
+        int[] students; //배열 변수 선언
+        students = new int[]{90,80,70,60,50}; //배열 생성과 초기화
+
+        for (int i = 0; i < students.length; i++)
+        System.out.println("학생" + (i + 1) + " 점수 : " + students[i]);
+
+    }
+}
@@ -0,0 +1,12 @@
+package array;
+
+public class Array1Ref4 {
+    public static void main(String[] args) { 
+
+        int[] students = {90,80,70,60,50}; //배열 생성과 초기화
+
+        for (int i = 0; i < students.length; i++)
+        System.out.println("학생" + (i + 1) + " 점수 : " + students[i]);
+
+    }
+}
@@ -0,0 +1,19 @@
+package array;
+
+public class ArrayDi4 {
+    public static void main(String[] args) {
+        int[][] arr = new int[4][4];
+
+        int i = 1;
+        for(int row = 0; row < arr.length; row++) {
+            for(int column = 0; column < arr[row].length; column++) {
+                arr[row][column] = i++;
+            }
+        }
+        for(int row = 0; row < arr.length; row++){
+            for(int column = 0; column<arr[row].length; column++)
+                System.out.print(arr[row][column]+ " ");
+            System.out.println();
+        }
+    }
+}
@@ -0,0 +1,24 @@
+package array;
+
+public class EnhancedFor1 {
+    public static void main(String[] args) {
+        int[] numbers = new int[]{1, 2, 3, 4, 5};
+
+        for (int i = 0; i < numbers.length; i++) {
+            int number = numbers[i];
+            System.out.print(number + " ");
+        }
+        //향상된 for문, for-each문
+        System.out.println();
+        for (int number : numbers) {
+            System.out.print(number + " ");
+        }
+
+        System.out.println();
+
+        //for-each문을 사용할 수 없는 경우
+        for(int i = 0; i < numbers.length; i++) {
+            System.out.println("number" + i + "번의 결과는 : " + numbers[i]);
+        }
+    }
+}