这会是接下来很长一段时间的最后一个commit(可能)，当内阁去啦

src/class10/ScannerDemo1.java

@@ -0,0 +1,19 @@
+package class10;
+
+import java.util.Scanner;
+
+public class ScannerDemo1 {
+    public static void main(String[] args) {
+        printUserInfo();
+
+
+    }
+    public static void printUserInfo(){
+        Scanner sc = new Scanner(System.in);
+        System.out.println("请输入用户名：");
+        String name = sc.next();
+        System.out.println("请输入年龄：");
+        int age = sc.nextInt();
+        System.out.println("用户名是："+name+"，年龄是："+age);
+    }
+}

src/class11/OperatorDemo1.java

@@ -0,0 +1,25 @@
+package class11;
+
+public class OperatorDemo1 {
+    public static void main(String[] args) {
+        print(10,20);
+        print2();
+    }
+    public static void print(int a,int b){
+        System.out.println(a+b);
+        System.out.println(a-b);
+        System.out.println(a*b);
+        System.out.println(a/b);
+        System.out.println(a%b);
+        System.out.println(a>b);
+        System.out.println(a<b);
+    }
+    public static void print2(){
+        int a = 5;
+        System.out.println("abc"+ a); // abc5
+        System.out.println(a+5); // 10
+        System.out.println(a+'a'+"atheism");// atheima5
+        System.out.println("atheism"+a + 'a');// atheism5a
+
+    }
+}

src/class9/TypeDemo2.java

@@ -0,0 +1,22 @@
+package class9;
+
+public class TypeDemo2 {
+    public static void main(String[] args) {
+        System.out.println(calc2((byte)110,(byte)120));
+        System.out.println(calc3((byte)110,(byte)120));
+
+        System.out.println(calc(10,20,30,'a'));
+        System.out.println(calc(10,20,30.0,'a'));
+    }
+    // 需求：接收各种类型的数据运算
+    public static double calc(int a,int b,double c,char r){
+        return a + b + c+ r;
+    }
+    public static int calc2(byte a, byte b){
+        return a + b;
+    }
+    public static int calc3(byte a, byte b){
+        byte c = (byte) (a + b);
+        return c;
+    }
+}