hello

dmd.java

@@ -0,0 +1,56 @@
+import java.util.*;
+
+class area
+{
+	void display()
+	{
+		System.out.println("Area");
+	}
+}
+
+class triangle extends area
+{
+	Scanner sc = new Scanner(System.in);
+	int b,h;
+	void display()
+	{
+		System.out.println("Enter base & height:");
+		b = sc.nextInt();
+		h = sc.nextInt();
+		System.out.println("Area of triangle:"+(0.5*b*h));
+	}
+}
+
+class circle extends area
+{
+	Scanner sc = new Scanner(System.in);
+	int r;
+	void display()
+	{
+		System.out.println("Enter radius:");
+		r = sc.nextInt();
+		System.out.println("Area of triangle:"+(3.14*r*r));
+	}
+}
+
+class dmd
+{
+	public static void main(String[] args) 
+	{
+		int ch;
+		area a = null;
+		Scanner sc = new Scanner(System.in);
+		System.out.println("1.Triangle\n2.Circle\nEnter Choice:");
+		ch = sc.nextInt();
+		switch(ch)
+		{
+			case 1:
+				a = new triangle();
+				break;
+			case 2:
+				a = new circle();
+				break;
+		}
+		a.display();
+	}
+}

excep.java

@@ -0,0 +1,52 @@
+import java.util.*;
+
+class InvalidAgeException extends Exception 
+{
+	InvalidAgeException(String s) 
+	{
+		super(s);
+	}
+}
+
+/*class Testhrow 
+{
+    public  static void validate (int age) throws InvalidAgeException 
+    {
+		if(age < 18) 
+		{
+			throw new InvalidAgeException("Not valid");
+		}
+		else 
+		{
+			System.out.println("Valid");
+		}
+	}
+}*/
+class excep 
+{
+	public static void main(String args[]) 
+	{
+		Scanner sc = new Scanner(System.in);
+		int age = sc.nextInt();
+		try 
+		{
+			if(age < 18) 
+			{
+				throw new InvalidAgeException("Not valid");
+			}
+			else 
+			{
+				System.out.println("Valid");
+			}
+		}
+		catch (Exception e) 
+		{
+			System.out.println("Exception Occurs");
+		}
+		finally 
+		{
+			System.out.println("Rest of the code");
+		}
+	
+	} 
+}