diff --git "a/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\350\265\265\345\230\211\351\252\217/Demo.java" "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\350\265\265\345\230\211\351\252\217/Demo.java"
new file mode 100644
index 0000000000000000000000000000000000000000..693bdb65737ff971edce686d4f2a8210e7280654
--- /dev/null
+++ "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\350\265\265\345\230\211\351\252\217/Demo.java"
@@ -0,0 +1,18 @@
+
+public class Demo {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		for (int i = 1; i <= 9; i++) {
+			for (int j = 1; j <= 9; j++) {
+				if(!(i>j)) {
+					System.out.println(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/\350\265\265\345\230\211\351\252\217/Demo2.java" "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\350\265\265\345\230\211\351\252\217/Demo2.java"
new file mode 100644
index 0000000000000000000000000000000000000000..e4f424a9a40001c62c6bf1bf86f6b703259698ed
--- /dev/null
+++ "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\350\265\265\345\230\211\351\252\217/Demo2.java"
@@ -0,0 +1,25 @@
+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("请输入正方形边长：");
+		int num = scanner.nextInt();
+		
+		for (int i = 0; i < num; i++) {
+			for (int j = 0; j < num; j++) {
+				if(i==0 ||i==num-1|| j==0 ||j==num-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/\350\265\265\345\230\211\351\252\217/Demo3.java" "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\350\265\265\345\230\211\351\252\217/Demo3.java"
new file mode 100644
index 0000000000000000000000000000000000000000..976a351d525cc8565d64dbda9f05ba1baaa50ed2
--- /dev/null
+++ "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\350\265\265\345\230\211\351\252\217/Demo3.java"
@@ -0,0 +1,36 @@
+import java.util.Scanner;
+
+public class Demo3 {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		Scanner scanner = new Scanner (System.in);
+		
+		System.out.println("请输入菱形的边长：");
+		int size=scanner.nextInt();
+		
+		for (int i = 1; i <= size; i++) {
+			for (int j = 1; j <= size - i; j++) {
+				System.out.print(" ");
+			}
+			
+			for (int k = 1; k <= 2 * i - 1; k++) {
+				System.out.print('*');
+			}
+			System.out.println();
+		}
+		for (int i = 1; i <= size-1; i++) {
+			for (int j = 1; j <= i; j++){
+				System.out.print(" ");
+			}
+			
+			for (int k = 2*size-3; k >= 2 * i - 1; k--){
+				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/\350\265\265\345\230\211\351\252\217/Demo4.java" "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\350\265\265\345\230\211\351\252\217/Demo4.java"
new file mode 100644
index 0000000000000000000000000000000000000000..0ad372b949b0902ead5284837366527c6bc1d820
--- /dev/null
+++ "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\350\265\265\345\230\211\351\252\217/Demo4.java"
@@ -0,0 +1,22 @@
+import java.util.Scanner;
+
+public class Demo4 {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stu\
+Scanner scanner = new Scanner(System.in);
+		
+		System.out.println("请输入正方形边长：");
+		int num = scanner.nextInt();
+		
+		for (int i = 0; i < num; i++) {
+			for (int j = 0; j < num; 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/\350\265\265\345\230\211\351\252\217/Demo5.java" "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\350\265\265\345\230\211\351\252\217/Demo5.java"
new file mode 100644
index 0000000000000000000000000000000000000000..ac77dac3a3cbb3a496a1b4f4faa83463ca86c09f
--- /dev/null
+++ "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\350\265\265\345\230\211\351\252\217/Demo5.java"
@@ -0,0 +1,24 @@
+import java.util.Scanner;
+
+public class Demo5 {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+   Scanner scanner = new  Scanner (System.in);
+		
+		int sum =0;
+		
+		for (int i = 0; i < 5; i++) {
+			System.out.println("请用户输入金额：");
+			 int num= scanner.nextInt();
+			 
+			 if( num ==-1) {
+					break;
+				}
+			 sum += num;
+		}System.out.println("金额总额为"+sum);
+		
+
+	}
+
+}
diff --git "a/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\350\265\265\345\230\211\351\252\217/Demo6.java" "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\350\265\265\345\230\211\351\252\217/Demo6.java"
new file mode 100644
index 0000000000000000000000000000000000000000..695f399cb5402fc6801bbdeef32700bcd0606965
--- /dev/null
+++ "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\350\265\265\345\230\211\351\252\217/Demo6.java"
@@ -0,0 +1,18 @@
+import java.util.Scanner;
+
+public class Demo6 {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		Scanner scanner=new Scanner(System.in);
+		int a=1;
+		for (int i = 1; i < 10; i++) {
+		a=(a+1)*2;
+		}
+		System.out.println(a);
+	    }
+	    
+
+	}
+
+
diff --git "a/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\350\265\265\345\230\211\351\252\217/Demo7.java" "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\350\265\265\345\230\211\351\252\217/Demo7.java"
new file mode 100644
index 0000000000000000000000000000000000000000..31e8f9794d96104465ca9937ac8f9194a9e47da3
--- /dev/null
+++ "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\350\265\265\345\230\211\351\252\217/Demo7.java"
@@ -0,0 +1,31 @@
+import java.util.Scanner;
+
+public class Demo7 {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		Scanner scanner=new Scanner(System.in);
+		int []a=new int[6];
+		int sum=0;
+		for (int i = 0; i < 6; i++) {
+			System.out.println("请为选手评分");
+		 a[i]=scanner.nextInt();
+		 sum+=a[i];
+		}
+		int max=a[0];
+		int min=a[0];
+		for(int k=1;k<6;k++) {
+			if(max<a[k]) {
+				max=a[k];
+			}
+		}
+		for(int g=1;g<6;g++) {
+			if(min>a[g]) {
+				min=a[g];
+				}
+		}
+		System.out.println("选手最终得分为："+((sum-max-min)/4));
+
+	}
+
+}
diff --git "a/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\350\265\265\345\230\211\351\252\217/Demo8.java" "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\350\265\265\345\230\211\351\252\217/Demo8.java"
new file mode 100644
index 0000000000000000000000000000000000000000..5e1928e0136d94908f6da5437f59696961978384
--- /dev/null
+++ "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\350\265\265\345\230\211\351\252\217/Demo8.java"
@@ -0,0 +1,21 @@
+
+public class Demo8 {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		int a;
+		int b;
+		int c;
+		
+		for (int i = 100; i <= 999; i++) {
+			a = i / 100;
+			b= i % 100 / 10;
+			c = i % 100 % 10;
+			if (a * a * a + b * b*b+ c * c * c== i) {
+				System.out.println(i); 
+			}
+		}
+
+	}
+
+}
diff --git "a/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\350\265\265\345\230\211\351\252\217/Demo9.java" "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\350\265\265\345\230\211\351\252\217/Demo9.java"
new file mode 100644
index 0000000000000000000000000000000000000000..bedc86875d28f77c761d7e269c4b8effe250781c
--- /dev/null
+++ "b/Java\347\254\254\345\205\253\346\254\241\344\275\234\344\270\232/\350\265\265\345\230\211\351\252\217/Demo9.java"
@@ -0,0 +1,17 @@
+import java.util.Scanner;
+
+public class Demo9 {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		Scanner scanner=new Scanner(System.in);
+		
+		int arr[]= {19,28,37,46,50};
+		System.out.println("请输入一个有用的数据");
+		int i=scanner.nextInt();
+		int sum=arr[i];
+		System.out.println("索引值为："+sum);
+
+	}
+
+}