diff --git "a/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\346\235\216\345\255\220\346\272\220/Demo01.java" "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\346\235\216\345\255\220\346\272\220/Demo01.java"
new file mode 100644
index 0000000000000000000000000000000000000000..1434d72c20e3bfda3775f0ba2b1f08b832cb6905
--- /dev/null
+++ "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\346\235\216\345\255\220\346\272\220/Demo01.java"
@@ -0,0 +1,19 @@
+package lession;
+
+import java.util.Scanner;
+
+public class Demo01 {
+
+	public static void main(String[] args) {
+		Scanner scanner = new Scanner(System.in);
+		System.out.println("请输入第一个数值");
+		int a = scanner.nextInt();
+		System.out.println("请输入第二个数值");
+		int b = scanner.nextInt();
+		System.out.println("请输入第三个数值");
+		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/\346\235\216\345\255\220\346\272\220/Demo02.java" "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\346\235\216\345\255\220\346\272\220/Demo02.java"
new file mode 100644
index 0000000000000000000000000000000000000000..f3e529e31a1f4bdbbe4aa8c1fefdf0de8a3d30de
--- /dev/null
+++ "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\346\235\216\345\255\220\346\272\220/Demo02.java"
@@ -0,0 +1,21 @@
+package lession;
+
+import java.util.Scanner;
+
+public class Demo02 {
+
+
+	public static void main(String[] args) {
+		Scanner scan =new Scanner(System.in);
+		System.out.println("值");
+		int a =(int) scan.nextDouble();
+		System.out.println("值");
+		int b=scan.nextInt();
+		int c = 1;
+		for (int i = 1; i <= b; i++) {
+			c=a*c;
+			}
+		System.out.println(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/\346\235\216\345\255\220\346\272\220/Demo03.java" "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\346\235\216\345\255\220\346\272\220/Demo03.java"
new file mode 100644
index 0000000000000000000000000000000000000000..5ea2ec27750bd5962902ac5e120465636660318e
--- /dev/null
+++ "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\346\235\216\345\255\220\346\272\220/Demo03.java"
@@ -0,0 +1,37 @@
+package lession;
+
+import java.util.Random;
+import java.util.Scanner;
+
+public class Demo03 {
+
+	public static void main(String[] args) {
+		Scanner scanner = new Scanner(System.in);
+		Random random = new Random();
+		int a = random.nextInt(100)+1;
+		System.out.println("系统已随机生成了数字");
+		int b ;
+		int c = 0 ;
+		while (true) {
+			System.out.println("请猜：");
+			b = scanner.nextInt();
+			
+			if (b<a) {
+				System.out.println("你猜小了！");
+			}else if (b>a){
+				System.out.println("你猜大了！");
+			}else {
+				if (c==1) {
+					System.out.println("你真棒！一次就中了！");
+				}else if(c>=2&&c<6) {
+					System.out.println("恭喜你，猜对了！");
+				}else {
+					System.out.println("有点菜！");
+				}
+				break;
+			}
+		}
+
+	}
+
+}
diff --git "a/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\346\235\216\345\255\220\346\272\220/Demo04.java" "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\346\235\216\345\255\220\346\272\220/Demo04.java"
new file mode 100644
index 0000000000000000000000000000000000000000..69b4bdfde92460286daeb9ee6dfe8b3aea794962
--- /dev/null
+++ "b/java\347\254\254\345\215\201\346\254\241\344\275\234\344\270\232/\346\235\216\345\255\220\346\272\220/Demo04.java"
@@ -0,0 +1,58 @@
+package lession;
+
+import java.util.Random;
+import java.util.Scanner;
+
+public class Demo04 {
+
+	public static void main(String[] args) {
+		Scanner scanner = new Scanner(System.in);
+		Random random = new Random();
+		int [] nums = new int[10];
+		
+		for (int i = 0 ; i < 10 ; i++) {
+			System.out.println("请输入数字：");
+			nums[i] = scanner.nextInt();
+		}
+		int max = nums [0];
+		int min = nums [0];
+		
+		for(int i = 0 ; i < nums.length ; i++) {
+			if(max<nums[i]) {
+				max = nums[i];
+			}
+			if(min>nums[i]) {
+				min = nums[i];
+			}
+		}
+		System.out.println("change之前");
+		for(int i= 0 ; i < nums.length ; i++) {
+			System.out.print(nums[i]+"\t");
+		}
+			
+		change(max,min,nums);
+		
+		System.out.println("change之后");
+		for(int i= 0 ; i < nums.length ; i++) {
+			System.out.print(nums[i]+"\t");
+		}
+
+	}
+
+	private static void change(int max, int min, int[] nums) {
+		int maxIndex = 0 ;
+		int minIndex = 0 ;
+		int temp;
+		
+		for(int i = 0 ; i < nums.length ; i++) {
+			if (max == nums[i]) {
+				maxIndex = i ;
+			}
+			if (min == nums[i]) {
+				minIndex = i ;
+			}
+		}
+		
+	}
+
+}