diff --git "a/java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\276\220\351\252\217\351\271\217/Demo01.java" "b/java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\276\220\351\252\217\351\271\217/Demo01.java"
new file mode 100644
index 0000000000000000000000000000000000000000..3c9d63884509f9421c2e6e01d3ade04d0e168379
--- /dev/null
+++ "b/java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\276\220\351\252\217\351\271\217/Demo01.java"
@@ -0,0 +1,51 @@
+package sss;
+
+import java.util.Scanner;
+
+public class Demo01 {
+	private static final String AB = null;
+
+	public static void main(String[] args) {
+		Scanner scanner = new Scanner(System.in);
+		
+		System.out.println("微型计数器");
+		
+		System.out.println("请输入一个数字");
+		int B  = scanner.nextInt();
+		
+		System.out.println("请输入算法");
+		String ch =scanner.next();
+		
+		System.out.println("请输入第二个数字");
+		int  A = scanner.nextInt();
+		
+		switch(ch) {
+		case"+":
+			System.out.println(""+ A+B);
+			break;
+
+		case"-":
+			System.out.println(""
+					A-B);
+			break;
+			
+		case"*":
+			System.out.println();
+			break;
+			
+		case"/":
+			System.out.println();
+			break;
+		default:
+			System.out.println("输入错误");
+			break;
+
+		
+		}
+	}
+
+	
+		
+	}
+
+}
diff --git "a/java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\276\220\351\252\217\351\271\217/Demo02.java" "b/java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\276\220\351\252\217\351\271\217/Demo02.java"
new file mode 100644
index 0000000000000000000000000000000000000000..7015aa861a14a71a071d58ed7738a3b02191912d
--- /dev/null
+++ "b/java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\276\220\351\252\217\351\271\217/Demo02.java"
@@ -0,0 +1,13 @@
+package sss;
+
+public class Demo02 {
+
+	public static void main(String[] args) {
+		int a = 1;
+		while(a<10) {
+			System.out.println((a)+"X"+3 +"=" +(a++*3));
+		}
+
+	}
+
+}
diff --git "a/java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\276\220\351\252\217\351\271\217/Demo03.java" "b/java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\276\220\351\252\217\351\271\217/Demo03.java"
new file mode 100644
index 0000000000000000000000000000000000000000..5c888c6d10bcd5d2d69ad74b8c1a34612cfeee3c
--- /dev/null
+++ "b/java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\276\220\351\252\217\351\271\217/Demo03.java"
@@ -0,0 +1,24 @@
+package sss;
+
+import java.util.Scanner;
+
+public class Demo03 {
+
+	public static void main(String[] args) {
+		// 用循环的方法接受用户输入的五个成绩，并求它们的和。
+		Scanner scanner = new Scanner(System.in);
+		int a = 1;
+		double x;
+		double c=0;
+		
+		
+		
+			 do {System.out.println("请输入第" + a++ + "个数字");				 
+			 	 x= scanner.nextDouble();
+				 c=x+c;
+				 a=a++;}
+				
+				 while (a<=5);
+				 System.out.println("五个成绩总和："+c);}}
+	
+	
diff --git "a/java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\276\220\351\252\217\351\271\217/Demo04.java" "b/java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\276\220\351\252\217\351\271\217/Demo04.java"
new file mode 100644
index 0000000000000000000000000000000000000000..ba846f4b268792157ab94b42fc2785d0834acb9c
--- /dev/null
+++ "b/java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\276\220\351\252\217\351\271\217/Demo04.java"
@@ -0,0 +1,14 @@
+package sss;
+
+public class Demo04 {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		for (int i = 1; i <=10 ; i++) {
+			System.out.println((i)+"X"+3+"=" +(i*3));
+			
+		}
+
+	}
+
+}
diff --git "a/java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\276\220\351\252\217\351\271\217/Demo05.java" "b/java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\276\220\351\252\217\351\271\217/Demo05.java"
new file mode 100644
index 0000000000000000000000000000000000000000..47c7a8853cbc1ef0046d3000bc36978d0f87c28c
--- /dev/null
+++ "b/java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\276\220\351\252\217\351\271\217/Demo05.java"
@@ -0,0 +1,10 @@
+package sss;
+
+public class Demo05 {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+
+	}
+
+}
diff --git "a/java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\276\220\351\252\217\351\271\217/Demo06.java" "b/java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\276\220\351\252\217\351\271\217/Demo06.java"
new file mode 100644
index 0000000000000000000000000000000000000000..0bbf129911f9201aa04e73e259c9eefb83232329
--- /dev/null
+++ "b/java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\276\220\351\252\217\351\271\217/Demo06.java"
@@ -0,0 +1,35 @@
+package md.com;
+
+import java.util.Scanner;
+
+public class Demo06 {
+
+	public static void main(String[] args) {
+		Scanner scan= new Scanner (System.in);
+		System.out.println("今天星期几");
+
+		int A = scan.nextInt();
+
+
+		switch (A) {
+		case '1' :
+			System.out.println("上班");
+		case '2' :
+			System.out.println("上班");
+		case '3' :
+			System.out.println("上班");
+		case '4' :
+			System.out.println("上班");
+		case '5' :
+			System.out.println("上班");
+		break;
+		case '6' :
+			System.out.println("休息");
+		case '7' :
+			System.out.println("休息");
+			break;
+}
+
+	}
+
+}
diff --git "a/java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\276\220\351\252\217\351\271\217/Demo07.java" "b/java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\276\220\351\252\217\351\271\217/Demo07.java"
new file mode 100644
index 0000000000000000000000000000000000000000..369c5998afc14cbafffb4a215f017666d7f5e993
--- /dev/null
+++ "b/java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\276\220\351\252\217\351\271\217/Demo07.java"
@@ -0,0 +1,73 @@
+package md.com;
+
+import java.util.Scanner;
+
+public class Demo07 {
+
+	public static void main(String[] args){
+		
+		Scanner scan = new Scanner(System.in);
+
+		System.out.println("今天星期几");
+
+		int b = scan.nextInt();
+
+ switch (b) {
+
+case 1:
+
+	System.out.println("跑步");
+
+	break;
+
+case 2:
+
+	System.out.println("游泳  ");
+
+	break;
+
+case 3:
+
+	System.out.println("慢走");
+
+	break;
+
+case 4:
+
+	System.out.println("动感单车");
+
+	break;
+
+case 5:
+
+	System.out.println("拳击  ");
+
+	break;
+
+case 6:
+
+	System.out.println("爬山");
+
+	break;
+
+case 7:
+
+	System.out.println("好好吃一顿 ");
+
+	break;
+
+default:
+
+	System.out.println("输入错误");
+
+	break;
+
+}
+
+	}
+
+
+		
+
+	}
+
diff --git "a/java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\276\220\351\252\217\351\271\217/Demo08.java" "b/java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\276\220\351\252\217\351\271\217/Demo08.java"
new file mode 100644
index 0000000000000000000000000000000000000000..d6fabeeba1d7635ecd2fcfa297dc67a9148ac652
--- /dev/null
+++ "b/java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\276\220\351\252\217\351\271\217/Demo08.java"
@@ -0,0 +1,26 @@
+package md.com;
+
+import java.util.Scanner;
+
+public class Demo08 {
+
+	public static void main(String[] args) {
+		
+		Scanner scaner = new Scanner(System.in);
+
+		System.out.println("请输入数字");
+
+		int c= scaner.nextInt();
+		for (int i = 2; i < c; ) {
+			if (c%i==0) {
+				System.out.println("该数字不是素数");
+				return;
+				
+			} else {System.out.println("该数字是素数");
+
+			}
+		}
+
+	}
+
+}
diff --git "a/java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\276\220\351\252\217\351\271\217/Demo09.java" "b/java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\276\220\351\252\217\351\271\217/Demo09.java"
new file mode 100644
index 0000000000000000000000000000000000000000..e7e3418ce559c6f793365fcdf37afbd5b9f468f2
--- /dev/null
+++ "b/java\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232/\345\276\220\351\252\217\351\271\217/Demo09.java"
@@ -0,0 +1,10 @@
+package md.com;
+
+public class Demo09 {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+
+	}
+
+}