diff --git "a/\346\226\271\346\263\225\347\273\203\344\271\240/\345\274\240\351\221\253/Deom02.java" "b/\346\226\271\346\263\225\347\273\203\344\271\240/\345\274\240\351\221\253/Deom02.java"
new file mode 100644
index 0000000000000000000000000000000000000000..0f5c7109450270fb59621d1f1695311d9ddc66aa
--- /dev/null
+++ "b/\346\226\271\346\263\225\347\273\203\344\271\240/\345\274\240\351\221\253/Deom02.java"
@@ -0,0 +1,18 @@
+
+public class Deom02 {
+
+	public static void main(String[] args) {
+		int[] arr = {2,3,4,5,6};
+		int number = max(arr);
+		System.out.println(number);
+	}
+	public static int max(int[] arr) {
+		int max = arr[0];
+		for (int i = 0; i < arr.length; i++) {
+			if (arr[i] > max) {
+				max = arr [i];
+			}
+		}
+		return max;
+	}
+}
diff --git "a/\346\226\271\346\263\225\347\273\203\344\271\240/\345\274\240\351\221\253/Deom03.java" "b/\346\226\271\346\263\225\347\273\203\344\271\240/\345\274\240\351\221\253/Deom03.java"
new file mode 100644
index 0000000000000000000000000000000000000000..b110b7502796402203e71194e0b4c89e4a903c87
--- /dev/null
+++ "b/\346\226\271\346\263\225\347\273\203\344\271\240/\345\274\240\351\221\253/Deom03.java"
@@ -0,0 +1,21 @@
+
+public class Deom03 {
+
+	public static void main(String[] args) {
+		int [] arr= {11,22,33,44,55};
+		arrr(arr);
+	}
+	public static void arrr(int [] aee) {
+		for (int i = 0; i < aee.length; i++) {
+			if (i==0) {
+				System.out.print("["+aee[i]+",");
+			}
+			else if (i<(aee.length-1)) {
+				System.out.print(aee[i]+",");
+			}
+			else {
+				System.out.print(aee[i]+"]");
+			}
+		}
+	}
+}
diff --git "a/\346\226\271\346\263\225\347\273\203\344\271\240/\345\274\240\351\221\253/Deom04.java" "b/\346\226\271\346\263\225\347\273\203\344\271\240/\345\274\240\351\221\253/Deom04.java"
new file mode 100644
index 0000000000000000000000000000000000000000..3dfccec01b824663082cf89abe606ecbf7b1e1c4
--- /dev/null
+++ "b/\346\226\271\346\263\225\347\273\203\344\271\240/\345\274\240\351\221\253/Deom04.java"
@@ -0,0 +1,26 @@
+
+public class Deom04 {
+
+	public static void main(String[] args) {
+		int [] arr = {20,30,40,50,60};
+		int[] maxandmin = getmaxandmin(arr);
+		System.out.println(maxandmin[0]);
+		System.out.println(maxandmin[1]);
+	}
+	public static int [] getmaxandmin(int[] arr) {
+		int max = arr[0];
+		for (int i = 1; i < arr.length; i++) {
+			if (max < arr[i]) {
+				max = arr[i];
+			}
+		}
+		int min = arr[0];
+		for (int i = 1; i < arr.length; i++) {
+			if (min > arr[i]) {
+				min = arr[i];
+			}
+		}
+		int [] maxandmin = {max,min};
+		return maxandmin;
+	}
+}