diff --git "a/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\237/B.java" "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\237/B.java"
new file mode 100644
index 0000000000000000000000000000000000000000..6711114f12ec957deeb4553aca8b08e640cb4b67
--- /dev/null
+++ "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\237/B.java"
@@ -0,0 +1,26 @@
+import java.util.Random;
+import java.util.Scanner;
+
+public class B {
+
+	public static void main(String[] args) {
+		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);
+		}
+		System.out.println("请输入一个数");
+		int b=scanner.nextInt();
+		System.out.println("你输入的数在随机数中有"+suiji(a,b)+"次");
+	}
+	public static int suiji(int a[],int b) {
+		int sum=0;
+		for (int i = 0; i < a.length; i++) {
+			if (b==a[i]) {
+				sum++;
+			}
+		}
+		return sum;
+	}
+}
\ No newline at end of file
diff --git "a/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\237/C.java" "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\237/C.java"
new file mode 100644
index 0000000000000000000000000000000000000000..1e651821e0ce5ecb4c9d3d73ecc5e71178c6f202
--- /dev/null
+++ "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\237/C.java"
@@ -0,0 +1,37 @@
+
+import java.util.Random;
+
+public class C {
+
+	public static void main(String[] args) {
+		Random random = new Random();
+		int[] a=new int[10];
+		for (int i = 0; i < 10; i++) {
+			a[i]=random.nextInt(10);
+		}
+		System.out.println(a);
+		int b=a[0];
+		int c=a[0];
+		int d=0;
+		int e=0;
+		for (int i = 0; i < 10; i++) {
+			if (b<a[i]) {
+				b=a[i];
+				d=i;
+			}
+			if (c>a[i]) {
+				c=a[i];
+				e=i;
+			}
+		}
+		shu(a,b,c,d,e);
+		System.out.println(a);
+	}
+	public static void shu(int a[],int b,int c,int d,int e) {
+		a[d]=a[0];
+		a[e]=a[9];
+		a[0]=b;
+		a[9]=c;
+	}
+
+}
\ No newline at end of file
diff --git "a/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\237/Mhs.java" "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\237/Mhs.java"
new file mode 100644
index 0000000000000000000000000000000000000000..46072835c342e86871bfecf96b828fd8fb13ef84
--- /dev/null
+++ "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\345\220\264\346\230\237/Mhs.java"
@@ -0,0 +1,20 @@
+import java.util.Scanner;
+
+public class A {
+
+	public static void main(String[] args) {
+		Scanner scanner = new Scanner(System.in);
+		System.out.println("请输入底数");
+		int a=scanner.nextInt();
+		System.out.println("请输入幂");
+		int b=scanner.nextInt();
+		System.out.println("幂函数值是"+mi(a,b));
+	}
+	public static int mi(int a,int b) {
+		int c=1;
+		for (int i = 1; i <= b; i++) {
+			c=c*a;
+		}
+		return c;
+	}
+}