diff --git "a/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\350\256\270\350\207\252\346\246\225/Demo1.java" "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\350\256\270\350\207\252\346\246\225/Demo1.java"
new file mode 100644
index 0000000000000000000000000000000000000000..7f61d92310fd8eeaefcb6e8bc7067c82d879d04f
--- /dev/null
+++ "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\350\256\270\350\207\252\346\246\225/Demo1.java"
@@ -0,0 +1,23 @@
+package com.md.lession8;
+
+import java.util.Scanner;
+
+public class Demo1 {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+			Scanner scanner=new Scanner(System.in);
+			System.out.println("请输入第一个数");
+			int a =scanner.nextInt();
+			System.out.println("请输入第二个数");
+			int b =scanner.nextInt();
+			System.out.println("请输入第三个数");
+			int c =scanner.nextInt();
+			int sum=(a*a*a)+(b*b*b)+(c*c*c);
+			System.out.println(sum);
+		}
+
+
+	}
+
+
diff --git "a/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\350\256\270\350\207\252\346\246\225/Demo2.java" "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\350\256\270\350\207\252\346\246\225/Demo2.java"
new file mode 100644
index 0000000000000000000000000000000000000000..c4c940b399ffb13b62bad87a857774afca96ae1a
--- /dev/null
+++ "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\350\256\270\350\207\252\346\246\225/Demo2.java"
@@ -0,0 +1,24 @@
+package com.md.lession8;
+
+import java.util.Scanner;
+
+public class Demo2 {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		Scanner scanner =new Scanner(System.in);
+		System.out.println("请用户输入一个数");
+		int a =(int) scanner.nextDouble();
+		System.out.println("请用户输入一个数");
+		int b=scanner.nextInt();
+		int c = 1;
+		for (int i = 1; i <= b; i++) {
+			c=a*c;
+			}
+		System.out.println(c);
+				}
+		
+
+	}
+
+
diff --git "a/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\350\256\270\350\207\252\346\246\225/Demo3.java" "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\350\256\270\350\207\252\346\246\225/Demo3.java"
new file mode 100644
index 0000000000000000000000000000000000000000..28a2f43ba18c949ea96c64e85814f117d235d12e
--- /dev/null
+++ "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\350\256\270\350\207\252\346\246\225/Demo3.java"
@@ -0,0 +1,28 @@
+package com.md.lession8;
+
+import java.util.Random;
+import java.util.Scanner;
+
+public class Demo3 {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		Scanner scanner=new Scanner(System.in);
+		Random random =new Random();
+		int[]a=new int[20];
+		for (int i = 0; i < 20; i++) {
+			a[i]=random.nextInt(10)+1;
+		}
+		System.out.println("璇风敤鎴疯緭鍏ヤ竴涓暟");
+		int b=scanner.nextInt();
+		int sum=0;
+		for (int i = 0; i < a.length; i++) {
+			if (b==a[i]) {
+				sum++;
+			}
+		}
+		System.out.println(sum);
+	}
+	}
+
+
diff --git "a/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\350\256\270\350\207\252\346\246\225/Demo4.java" "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\350\256\270\350\207\252\346\246\225/Demo4.java"
new file mode 100644
index 0000000000000000000000000000000000000000..13b8d3d832e991216d8091923f60658e9c8bfd99
--- /dev/null
+++ "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\350\256\270\350\207\252\346\246\225/Demo4.java"
@@ -0,0 +1,42 @@
+package com.md.lession8;
+
+import java.util.Random;
+
+public class Demo4 {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		Random random = new Random();
+		int[] a = new int[10];
+		for (int i = 0; i < a.length; i++) {
+			a[i] = random.nextInt(10) + 1;
+		}
+		int max = a[0];
+		int mix = a[0];
+		int maxIndex = 0;
+		int mixIndex = 0;
+
+		for (int i = 0; i < a.length; i++) {
+			if (max < a[i]) {
+				max = a[i];
+				maxIndex = i;
+			}
+			if (mix > a[i]) {
+				mix = a[i];
+				mixIndex = i;
+			}
+		}
+
+		int temp = a[0];
+		a[0] = max;
+		a[maxIndex] = temp;
+
+		temp = a[a.length - 1];
+		a[a.length - 1] = mix;
+		a[mixIndex] = temp;
+		for (int i = 0; i < a.length; i++) {
+			System.out.println(a[i]);
+		}
+	}
+
+}