diff --git a/lesson37/java/App/.vscode/launch.json "b/Lesson 37 - \330\247\331\204\330\257\330\261\330\263/java/App/.vscode/launch.json"
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rename from lesson37/java/App/.vscode/launch.json
rename to "Lesson 37 - \330\247\331\204\330\257\330\261\330\263/java/App/.vscode/launch.json"
diff --git a/lesson37/java/App/App/app1.java "b/Lesson 37 - \330\247\331\204\330\257\330\261\330\263/java/App/App/app1.java"
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rename from lesson37/java/App/App/app1.java
rename to "Lesson 37 - \330\247\331\204\330\257\330\261\330\263/java/App/App/app1.java"
diff --git a/lesson38/java/.vscode/launch.json "b/Lesson 38 - \330\247\331\204\330\257\330\261\330\263/java/.vscode/launch.json"
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rename to "Lesson 38 - \330\247\331\204\330\257\330\261\330\263/java/.vscode/launch.json"
diff --git a/lesson38/java/package1/App1.java "b/Lesson 38 - \330\247\331\204\330\257\330\261\330\263/java/package1/App1.java"
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rename from lesson38/java/package1/App1.java
rename to "Lesson 38 - \330\247\331\204\330\257\330\261\330\263/java/package1/App1.java"
diff --git a/lesson38/java/package2/App2.java "b/Lesson 38 - \330\247\331\204\330\257\330\261\330\263/java/package2/App2.java"
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rename from lesson38/java/package2/App2.java
rename to "Lesson 38 - \330\247\331\204\330\257\330\261\330\263/java/package2/App2.java"
diff --git a/lesson39/package1/.vscode/launch.json "b/Lesson 39 - \330\247\331\204\330\257\330\261\330\263/package1/.vscode/launch.json"
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rename from lesson39/package1/.vscode/launch.json
rename to "Lesson 39 - \330\247\331\204\330\257\330\261\330\263/package1/.vscode/launch.json"
diff --git a/lesson39/package1/package1/App1.java "b/Lesson 39 - \330\247\331\204\330\257\330\261\330\263/package1/package1/App1.java"
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rename from lesson39/package1/package1/App1.java
rename to "Lesson 39 - \330\247\331\204\330\257\330\261\330\263/package1/package1/App1.java"
diff --git a/lesson39/package1/package1/App2.java "b/Lesson 39 - \330\247\331\204\330\257\330\261\330\263/package1/package1/App2.java"
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rename from lesson39/package1/package1/App2.java
rename to "Lesson 39 - \330\247\331\204\330\257\330\261\330\263/package1/package1/App2.java"
diff --git a/lesson39/package1/package1/App3.java "b/Lesson 39 - \330\247\331\204\330\257\330\261\330\263/package1/package1/App3.java"
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rename from lesson39/package1/package1/App3.java
rename to "Lesson 39 - \330\247\331\204\330\257\330\261\330\263/package1/package1/App3.java"
diff --git a/lesson40/java/.vscode/launch.json "b/Lesson 40 - \330\247\331\204\330\257\330\261\330\263/java/.vscode/launch.json"
similarity index 100%
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rename to "Lesson 40 - \330\247\331\204\330\257\330\261\330\263/java/.vscode/launch.json"
diff --git a/lesson40/java/Admin.java "b/Lesson 40 - \330\247\331\204\330\257\330\261\330\263/java/Admin.java"
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rename from lesson40/java/Admin.java
rename to "Lesson 40 - \330\247\331\204\330\257\330\261\330\263/java/Admin.java"
diff --git a/lesson40/java/User.java "b/Lesson 40 - \330\247\331\204\330\257\330\261\330\263/java/User.java"
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rename from lesson40/java/User.java
rename to "Lesson 40 - \330\247\331\204\330\257\330\261\330\263/java/User.java"
diff --git a/lesson41/java/.vscode/launch.json "b/Lesson 41 - \330\247\331\204\330\257\330\261\330\263/java/.vscode/launch.json"
similarity index 100%
rename from lesson41/java/.vscode/launch.json
rename to "Lesson 41 - \330\247\331\204\330\257\330\261\330\263/java/.vscode/launch.json"
diff --git a/lesson41/java/App.java "b/Lesson 41 - \330\247\331\204\330\257\330\261\330\263/java/App.java"
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rename from lesson41/java/App.java
rename to "Lesson 41 - \330\247\331\204\330\257\330\261\330\263/java/App.java"
diff --git a/lesson41/java/Payment.java "b/Lesson 41 - \330\247\331\204\330\257\330\261\330\263/java/Payment.java"
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rename from lesson41/java/Payment.java
rename to "Lesson 41 - \330\247\331\204\330\257\330\261\330\263/java/Payment.java"
diff --git a/lesson42/App.java "b/Lesson 42 - \330\247\331\204\330\257\330\261\330\263/App.java"
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rename from lesson42/App.java
rename to "Lesson 42 - \330\247\331\204\330\257\330\261\330\263/App.java"
diff --git a/lesson43/App.java "b/Lesson 43 - \330\247\331\204\330\257\330\261\330\263/App.java"
similarity index 100%
rename from lesson43/App.java
rename to "Lesson 43 - \330\247\331\204\330\257\330\261\330\263/App.java"
diff --git a/lesson44/App.java "b/Lesson 44 - \330\247\331\204\330\257\330\261\330\263/App.java"
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rename from lesson44/App.java
rename to "Lesson 44 - \330\247\331\204\330\257\330\261\330\263/App.java"
diff --git a/lesson45/App.java "b/Lesson 45 - \330\247\331\204\330\257\330\261\330\263/App.java"
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rename from lesson45/App.java
rename to "Lesson 45 - \330\247\331\204\330\257\330\261\330\263/App.java"
diff --git a/lesson46/App.java "b/Lesson 46 - \330\247\331\204\330\257\330\261\330\263/App.java"
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rename from lesson46/App.java
rename to "Lesson 46 - \330\247\331\204\330\257\330\261\330\263/App.java"
diff --git a/lesson46/Payment.java "b/Lesson 46 - \330\247\331\204\330\257\330\261\330\263/Payment.java"
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rename from lesson46/Payment.java
rename to "Lesson 46 - \330\247\331\204\330\257\330\261\330\263/Payment.java"
diff --git a/Lesson 9 + 30/App.java "b/Lesson 47 - \330\247\331\204\330\257\330\261\330\263/App.java"
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rename from Lesson 9 + 30/App.java
rename to "Lesson 47 - \330\247\331\204\330\257\330\261\330\263/App.java"
diff --git a/Lesson 9 + 30/string_method.txt "b/Lesson 47 - \330\247\331\204\330\257\330\261\330\263/string_method.txt"
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rename from Lesson 9 + 30/string_method.txt
rename to "Lesson 47 - \330\247\331\204\330\257\330\261\330\263/string_method.txt"
diff --git "a/Lesson 48 - \330\247\331\204\330\257\330\261\330\263/App.java" "b/Lesson 48 - \330\247\331\204\330\257\330\261\330\263/App.java"
new file mode 100644
index 0000000..b92dc28
--- /dev/null
+++ "b/Lesson 48 - \330\247\331\204\330\257\330\261\330\263/App.java"	
@@ -0,0 +1,27 @@
+
+public class App{
+  
+     App(){
+       
+     }
+     public static void main(String[] args) {
+  
+        int number1 = 10;
+        int number2 = 20;
+        System.out.println("العدد الأكبر يكون : " + Math.max(number1, number2));
+        System.out.println("العدد الأصغر يكون : " + Math.min(number1, number2));
+        System.out.println("الجذر تربيعي للعدد 36 يكون " + Math.sqrt(36));
+        int number3 = -15;
+        System.out.println("القيمة مطلقة للعدد - 15 يكون : " + Math.abs(number3));
+        
+        double random_number = Math.random();
+        System.out.println("العدد العشوائي يكون : " + random_number);
+     }
+     
+ }
+ 
+ 
+ 
+ 
+ 
+       
\ No newline at end of file
diff --git "a/Lesson 48 - \330\247\331\204\330\257\330\261\330\263/math_java.txt" "b/Lesson 48 - \330\247\331\204\330\257\330\261\330\263/math_java.txt"
new file mode 100644
index 0000000..0667dfe
--- /dev/null
+++ "b/Lesson 48 - \330\247\331\204\330\257\330\261\330\263/math_java.txt"	
@@ -0,0 +1,18 @@
+
+
+
+
+
+
+		//      Math.max(x,y)   يستخدم لإيجاد العدد الأكبر بين عددين 
+		//      Math.min(x,y)   يستخدم لإيجاد العدد الأصغر بين عددين 
+		//      Math.sqrt(x)    يستخدم لعرض الجذر التربيعي للعدد الذي تحدده
+
+		//      Math.abs(x)     يستخدم لتحويل عدد سلبي إلى عدد إيجابي 
+		//      Math.random()   يقوم بجلب لك عدد عشوائي بين 0 و 1
+
+
+
+		        Coder Shiyar - مهندس شيار
+		        --------------------------------
+			https://youtube.com/codershiyar
\ No newline at end of file
diff --git a/lesson47/App.java "b/Lesson 9 + 30 - \330\247\331\204\330\257\330\261\330\263/App.java"
similarity index 100%
rename from lesson47/App.java
rename to "Lesson 9 + 30 - \330\247\331\204\330\257\330\261\330\263/App.java"
diff --git a/lesson47/string_method.txt "b/Lesson 9 + 30 - \330\247\331\204\330\257\330\261\330\263/string_method.txt"
similarity index 100%
rename from lesson47/string_method.txt
rename to "Lesson 9 + 30 - \330\247\331\204\330\257\330\261\330\263/string_method.txt"