diff --git a/OOP/Java/Lab/Week10/Sum.java b/OOP/Java/Lab/Week10/Sum.java
new file mode 100644
index 0000000..4943b49
--- /dev/null
+++ b/OOP/Java/Lab/Week10/Sum.java
@@ -0,0 +1,46 @@
+import java.util.*;
+class floatnum extends Exception
+{
+    float input;
+    floatnum(float num)
+    {
+        input=num;
+    }
+    public String toString()
+    {
+        return "Error:"+input+" is a Floating point number";
+    }
+}
+class Input_Exception
+{
+    public static void main(String[] args) {
+        int n,sum=0;
+        float input=0;
+        Scanner in=new Scanner(System.in);
+        System.out.println("Enter the numbers one at a time,enter -1 to calculate the sum");
+        while(true)
+        {
+            try
+            {
+                input=in.nextFloat();
+                if(input == -1)
+                {
+                    System.out.println("Sum="+sum);
+                    break;
+                }
+                else if(input%1!=0)
+                {
+                    throw new floatnum(input);
+                }
+                else
+                {
+                    sum=sum+(int)(input);
+                }
+            }
+            catch(floatnum e)
+            {
+                System.out.println(e.toString());
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/OOP/Java/Lab/Week10/Valid_matrix.java b/OOP/Java/Lab/Week10/Valid_matrix.java
new file mode 100644
index 0000000..9766198
--- /dev/null
+++ b/OOP/Java/Lab/Week10/Valid_matrix.java
@@ -0,0 +1,29 @@
+import java.util.*;
+class InvalidMatrixException extends Exception
+{
+    public String toString()
+    {
+        return "InvalidMatrixException:this is an Invalid Matrix";
+    }
+}
+public class Valid_matrix {
+    public static void main(String[] args) {
+        int row,col;
+        Scanner in=new Scanner(System.in);
+        System.out.println("Enter the number of rows and columns");
+        row=in.nextInt();
+        col=in.nextInt();
+        try
+        {
+            if(row!=col)
+            {
+                throw new InvalidMatrixException();
+            }
+            System.out.println("This is a valid matrix");
+        }
+        catch(InvalidMatrixException e)
+        {
+            System.out.println(e.toString());
+        }
+    }
+}
diff --git a/OOP/Java/Lab/Week10/numberformatexception.java b/OOP/Java/Lab/Week10/numberformatexception.java
new file mode 100644
index 0000000..602b9e3
--- /dev/null
+++ b/OOP/Java/Lab/Week10/numberformatexception.java
@@ -0,0 +1,17 @@
+import java.util.*;
+public class numberformatexception {
+    public static void main(String[] args) {
+        int a;
+        Scanner in=new Scanner(System.in);
+        System.out.print("Input:");
+        try{
+            a=Integer.parseInt(in.nextLine());
+            System.out.println("Number entered is "+a);
+        }
+        catch(NumberFormatException e)//As NumberFormatException is typecasting error 
+        {
+            System.out.println("Error:"+e.toString());
+        }
+    }
+    
+}
diff --git a/OOP/Java/Lab/Week10/root.java b/OOP/Java/Lab/Week10/root.java
new file mode 100644
index 0000000..6e624c1
--- /dev/null
+++ b/OOP/Java/Lab/Week10/root.java
@@ -0,0 +1,23 @@
+import java.util.*;
+public class root {
+ public static void main(String[] args) {
+    Scanner in=new Scanner(System.in);
+    System.out.println("Enter the number");
+    double num=in.nextDouble();
+    try
+    {
+        if(num<0)
+        {
+            throw new Exception();
+        }
+        System.out.print("Sqaure root="); 
+    }
+    catch(Exception e)
+    {
+        System.out.print("Negative number was entered\nsqaure root=i");
+        num=-num;
+    }
+    double root=Math.sqrt(num);
+    System.out.print(root);
+ }  
+}
\ No newline at end of file
diff --git a/OOP/Java/Lab/Week10/student.java b/OOP/Java/Lab/Week10/student.java
new file mode 100644
index 0000000..6e7085b
--- /dev/null
+++ b/OOP/Java/Lab/Week10/student.java
@@ -0,0 +1,47 @@
+import java.util.*;
+class studrecord{
+    String Name;
+    int rollno;
+    int marks[]=new int[3];
+    int percent=0;
+    studrecord(String name,int roll, int marks[])
+    {
+        Name=name;
+        rollno=roll;
+        this.marks=marks;
+        percent=(marks[0]+marks[1]+marks[2])/3;
+    }
+    char getgrade()
+    {    
+        if(percent>90)
+            return 'A';
+        else if(percent>80)
+            return 'B';
+        else if(percent>70)
+            return 'C';
+        return 'F'; 
+    } 
+}
+public class student {
+    public static void main(String[] args) {
+        Scanner in=new Scanner(System.in);
+        try{
+            System.out.println("Enter the name,roll number and the marks in 3 subjects simutaneously");
+            String name=in.nextLine();
+            int roll=Integer.parseInt(in.nextLine());
+            int marks[]=new int[3];
+            for(int i=0;i<3;i++)
+            {
+                int a=Integer.parseInt(in.nextLine());
+                marks[i]=a;
+            }
+            studrecord stud=new studrecord(name, roll, marks);
+            System.out.println("Succesfully Entered");
+            System.out.println("Percentage="+stud.percent+"%\nGrade:"+stud.getgrade());
+        }
+        catch(NumberFormatException e)
+        {
+            System.out.println("Error:NumberFormatException Occured");
+        }
+    }
+}