diff --git "a/Java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo10.java" "b/Java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo10.java"
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git "a/Java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo11.java" "b/Java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo11.java"
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git "a/Java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo2.java" "b/Java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo2.java"
new file mode 100644
index 0000000000000000000000000000000000000000..c61a486ba6daa3be307dd569481ea9949af86c7e
--- /dev/null
+++ "b/Java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo2.java"
@@ -0,0 +1,20 @@
+package com.md.lesson1;
+
+public class Demo2 {
+
+	public static void main(String[] args) {
+		int a = 3;
+		
+		
+		while(a<=9) {
+			a=a++;
+			System.out.println((a++)+"*"+"3"+"="+"?");
+			
+		}
+		
+			
+		}
+
+	}
+
+
diff --git "a/Java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo3.java" "b/Java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo3.java"
new file mode 100644
index 0000000000000000000000000000000000000000..584bbe7d92c74f42493dc2254a62090bbf6cc9b6
--- /dev/null
+++ "b/Java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo3.java"
@@ -0,0 +1,14 @@
+package com.md.lesson1;
+
+public class Demo3 {
+
+	public static void main(String[] args) {
+		int a = 0;
+		while(a<=10){
+			a++;
+			System.out.println("**********");
+			
+		}
+	}
+
+}
diff --git "a/Java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo4.java" "b/Java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo4.java"
new file mode 100644
index 0000000000000000000000000000000000000000..538a86e799810bc87770a03b2e755bc5f899972e
--- /dev/null
+++ "b/Java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo4.java"
@@ -0,0 +1,28 @@
+package com.md.lesson1;
+
+import java.util.Scanner;
+
+public class Demo4 {
+
+	public static void main(String[] args) {
+		Scanner scanner = new Scanner(System.in);
+		int a = 1;
+		int x ;
+		int c = 0;
+		
+		do {
+			System.out.println("请输入第"+  a++  +"个成绩：");
+			x = scanner .nextInt();
+			a=a++;
+			c=x+c;
+			
+			
+		} while (a<=5);
+		System.out.println("sum=" +c);
+		
+		
+		
+
+	}
+
+}
diff --git "a/Java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo5.java" "b/Java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo5.java"
new file mode 100644
index 0000000000000000000000000000000000000000..6a4162566511f5001f816ba96d1ac607d5237414
--- /dev/null
+++ "b/Java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo5.java"
@@ -0,0 +1,31 @@
+package com.md.lesson1;
+
+import java.util.Scanner;
+
+public class Demo5 {
+
+	public static void main(String[] args) {
+		Scanner scanner = new Scanner(System.in);
+		int a = 1;
+		int sum = 0;
+		while (a<=5) {
+			System.out.println("请输入成绩：");
+			a++;
+			int score = scanner.nextInt();
+			if (score>=0&&score<=100) {
+				sum = sum + score;
+				
+			} else {
+				System.out.println("改成绩有误，不列入计算！");
+				a++;
+
+			}
+			
+			
+		}
+		System.out.println("sum=" +sum);
+		
+
+	}
+
+}
diff --git "a/Java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo6.java" "b/Java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo6.java"
new file mode 100644
index 0000000000000000000000000000000000000000..a5ff58f0746af634172cecbd4932a4f5bb5ffe66
--- /dev/null
+++ "b/Java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo6.java"
@@ -0,0 +1,13 @@
+package com.md.lesson1;
+
+public class Demo6 {
+
+	public static void main(String[] args) {
+		for (int i = 3; i <=9; i=i++) {
+			System.out.println( (i++) + "*" + "3" + "=" +"?" );
+			
+		}
+
+	}
+
+}
diff --git "a/Java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo7.java" "b/Java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo7.java"
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git "a/Java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo8.java" "b/Java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo8.java"
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git "a/Java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo9.java" "b/Java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo9.java"
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git "a/Java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Deom1.java" "b/Java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Deom1.java"
new file mode 100644
index 0000000000000000000000000000000000000000..09dce648583c1b7f3e6168f928a4c7d1345365b5
--- /dev/null
+++ "b/Java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Deom1.java"
@@ -0,0 +1,61 @@
+package com.md.lesson1;
+
+import java.util.Scanner;
+
+public class Deom1 {
+
+	public static void main(String[] args) {
+		System.out.println("*********************************");
+		System.out.println("*****微型计算器              ****");
+		System.out.println("*****1、求和                 ****");
+		System.out.println("*****2、求差                 ****");
+		System.out.println("*****3、求积                 ****");
+		System.out.println("*****4、求商                 ****");
+		System.out.println("*****5、求余                 ****");
+		System.out.println("*****Q、退出                 ****");
+		System.out.println("*****请选择您想执行的操作    ****");
+		System.out.println("*********************************");
+		
+		Scanner scanner = new Scanner(System.in);
+		String choose = scanner.next();
+		
+		System.out.println("请输入第一个数字：");
+		int a = scanner.nextInt();
+		System.out.println("请输入第二个数字：");
+		int b = scanner.nextInt();
+		
+		switch (choose) {
+		case "1":
+			System.out.println("结果是："+(a+b));
+			break;
+		case "2":
+			System.out.println("结果是："+(a-b));
+			break;
+		case "3":
+			System.out.println("结果是："+(a*b));
+			break;
+		case "4":
+			System.out.println("结果是："+(a/b));
+			break;
+		case "5":
+			System.out.println("结果是："+(a%b));
+			break;
+		case "Q":
+			System.out.println("退出成功！");
+			break;
+
+
+
+		}
+
+		
+		
+
+		
+		}
+		
+		
+
+	}
+
+
diff --git "a/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo1.java" "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo1.java"
new file mode 100644
index 0000000000000000000000000000000000000000..3404fcc76c8cf7011e1797ce50f95b9b5a0c9163
--- /dev/null
+++ "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo1.java"
@@ -0,0 +1,38 @@
+package com.md.lesson01;
+
+import java.text.BreakIterator;
+import java.util.Scanner;
+import java.util.concurrent.BrokenBarrierException;
+
+public class Demo1 {
+
+	public static void main(String[] args) {
+		Scanner scanner = new Scanner(System.in);
+		int sum = 0;
+		
+		for (int i = 0; i < 5; i++) {
+			System.out.println("请输入买商品的金额：");
+			int a =scanner.nextInt();
+			sum = sum + a;
+			System.out.println(a+"元");
+			
+			if (a>-1 && a<0 && a<-1) {
+				System.out.println("金额错误 ! 重新输入。");
+				continue;
+				
+				
+			}
+			if (a==-1) {
+				System.out.println("sum="+sum);
+				break;
+				
+				
+			}
+			
+			
+			
+		}
+
+	}
+
+}
diff --git "a/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo2.java" "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo2.java"
new file mode 100644
index 0000000000000000000000000000000000000000..4acb542dc21e2feaaa906e537eb7a2a840dd6752
--- /dev/null
+++ "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo2.java"
@@ -0,0 +1,15 @@
+package com.md.lesson01;
+
+public class Demo2 {
+
+	public static void main(String[] args) {
+		int a =1;
+		
+		for (int i = 0; i < 10; i++) {
+			System.out.println("第" +(10-i)+ "天的桃子数量为" +a);
+			a = a*2+2;
+		}
+
+	}
+
+}
diff --git "a/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo3.java" "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo3.java"
new file mode 100644
index 0000000000000000000000000000000000000000..e1fa25e83a2740fab285bb9e59dcc90b7a6b775b
--- /dev/null
+++ "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo3.java"
@@ -0,0 +1,22 @@
+package com.md.lesson01;
+
+public class Demo3 {
+
+	public static void main(String[] args) {
+		int num1;
+		int num2;
+		int num3;
+		for (int i = 100; i < 999; i++) {
+			num1 = i/100;
+			num2 = i/10;
+			num2 = num2%10;
+			num3 = i%10;
+			if(num1*num1*num1+num2*num2*num2+num3*num3*num3==i){
+				System.out.println("水仙花数有：" +i);
+			}
+			
+		}
+
+	}
+
+}
diff --git "a/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo4.java" "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo4.java"
new file mode 100644
index 0000000000000000000000000000000000000000..757c5cd635f11a72f2ad3d7b75efd0b4e80e3802
--- /dev/null
+++ "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo4.java"
@@ -0,0 +1,18 @@
+package com.md.lesson01;
+
+public class Demo4 {
+
+	public static void main(String[] args) {
+		for (int i = 1; i <= 9; i++) {
+			for (int j = 1; j <=9; j++) {
+				if (i>=j) {
+					System.out.print(i + "*" + j + "=" + i*j +"\t");
+					
+				}
+			}
+			System.out.println();
+		}
+
+	}
+
+}
diff --git "a/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo5.java" "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo5.java"
new file mode 100644
index 0000000000000000000000000000000000000000..a529a17dba0be2d85ebbddf4b554cd2a6aa55c82
--- /dev/null
+++ "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo5.java"
@@ -0,0 +1,27 @@
+package com.md.lesson01;
+
+import java.util.Scanner;
+
+public class Demo5 {
+
+	public static void main(String[] args) {
+		Scanner scanner = new Scanner(System.in);
+		System.out.println("请输入正方形的边长：");
+		int a =scanner.nextInt();
+		
+		
+		
+		
+		for (int i = 0; i <a; i++) {
+			for (int j = 0; j < a; j++) {
+				System.out.print(" *");
+				
+			}
+			System.out.println();
+			
+			
+		}
+
+	}
+
+}
diff --git "a/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo6.java" "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo6.java"
new file mode 100644
index 0000000000000000000000000000000000000000..04e24ece929ff3ad4a45198b3ac906396e5c6b16
--- /dev/null
+++ "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo6.java"
@@ -0,0 +1,30 @@
+package com.md.lesson01;
+
+import java.util.Scanner;
+
+public class Demo6 {
+
+	public static void main(String[] args) {
+		Scanner scanner = new Scanner(System.in);
+		System.out.println("请输入正方形的边长：");
+		int a = scanner.nextInt();
+		
+		for (int i = 0; i < a; i++) {
+			for (int j = 0; j < a; j++) {
+				if (j==0||j==a-1||i==0||i==a-1) {
+					System.out.print(" *");
+					
+				}else {
+					System.out.print("  ");
+				}
+				
+				
+			}
+			System.out.println();
+			
+		}
+		
+
+	}
+
+}
diff --git "a/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo7.java" "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo7.java"
new file mode 100644
index 0000000000000000000000000000000000000000..cc6f85d52fb5c78efc104d722ee0a709a7826ec1
--- /dev/null
+++ "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo7.java"
@@ -0,0 +1,31 @@
+package com.md.lesson1;
+
+import java.util.Scanner;
+
+public class Demo7 {
+
+	public static void main(String[] args) {
+		//需求：
+	    //已知一个数组 arr = {19, 28, 37, 46, 50};
+		//键盘录入一个数据，查找该数据在数组中的索引，并在控
+	    //制台输出找到的索引值。
+		Scanner scanner =new Scanner (System.in);
+		
+		int[] arr = {19,28,37,46,50};
+		String [] b = new String[5];
+		int a = 0;
+		
+		
+		
+		for (int i = 0; i < 5; i++) {
+			a = a + 1;
+			System.out.println("请输入序号" + a  +":");
+			b[i] = scanner .next();
+			System.out.println(arr[i]);
+			
+		}
+		
+
+	}
+
+}
diff --git "a/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo8.java" "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo8.java"
new file mode 100644
index 0000000000000000000000000000000000000000..336ae4e9cbb97809c112e9fc73ffbfce7c0e33b1
--- /dev/null
+++ "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\345\274\240\345\256\217/Demo8.java"
@@ -0,0 +1,34 @@
+package com.md.lesson1;
+
+import java.util.Scanner;
+
+public class Demo8 {
+
+	public static void main(String[] args) {
+		//需求：在编程竞赛中，有6个评委为参赛的选手打分，分数为0-100的整数分。
+        //选手的最后得分为：
+		//去掉一个最高分和一个最低分后 的4个评委平均值 (不考虑小数部分)。
+        //补充说明：在控制台输入评委的评分后，输出选手的最终得
+		Scanner scanner = new Scanner (System.in);
+		int[] arr = {20,35,45,50,55,60};
+		String [] b = new String[6];
+		int a = 0;
+		
+		for (int i = 0; i < 6 ; i++) {
+			a = a + 1;
+			System.out.println("请输入第" + a + "位评委给的分(输入对应评委序号，如第一位输入‘1’)：");
+			b [i] = scanner .next();
+			System.out.println(arr[i]);
+			
+			
+		}
+		int c = 35;
+		int d = 45;
+		int e = 55;
+		int f = c + d + e ;
+		System.out.println("减去一个最高分，减去一个最低分，最后得分为:" +f/3);
+		
+		
+	}
+
+}