sankaa

package patterns1;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.InputMismatchException;
import java.util.Scanner;

public class ExceptionDemo {
public static void main(String[] args) {
	ExceptionDemo ed = new ExceptionDemo();
	//ed.divide1();
	//ed.divide2(); 
	//ed.divide3(); 
	//ed.checkedExceptionDemo(); 
	try {
		ed.getPassword();
	} catch (PwdException e) {
		// TODO Auto-generated catch block
		//e.printStackTrace();
	} 
	
}

private void getPassword() throws PwdException {
	// TODO Auto-generated method stub
	Scanner sc = new Scanner(System.in); 
	System.out.println("enter password");
	String password = sc.next(); 

	if(password.length() <8)
	{
		//PwdException pwde = new PwdException("Less than 8 Exception"); 
		//throw pwde; 
		throw new PwdException("Less than 8 Exception"); //Anonymous Object
	}
}

private void checkedExceptionDemo() {
	// TODO Auto-generated method stub
	//Scanner sc = new Scanner(System.in); 
	 // String fileName = sc.next();//c://new.txt 
	 // File file = new File(fileName); 
	  /*try {
	   file.createNewFile();
	  } catch (IOException e1) {
	   // TODO Auto-generated catch block
	   e1.printStackTrace();
	  } */
	File file = new File("abcd.txt"); 
	  try {
	   FileReader fr = new FileReader(file);
	  } catch (FileNotFoundException e) {
	   // TODO Auto-generated catch block
	   System.out.println("Please check file location");
	  } 
	  
	 
}

private void divide3() {
	// TODO Auto-generated method stub
	 int[] ar = new int[5]; 
	  try {
	  //login - username, password
	   // 10 minutes
	   //System.out.println("hi");
	   System.out.println(10/0);
	   System.out.println("hi");
	   
	  }
	  catch(Exception e)
	  {
	   //e.printStackTrace();
	   //System.out.println(e.getMessage()); 
	   
	   System.out.println("Check Check");
	  }
	  finally
	  {
	   
	   System.out.println("finally block");
	  }
	  System.out.println("Proceed further");
	   
	 
}

private void divide2() {
	// TODO Auto-generated method stub
	Scanner sc  = new Scanner(System.in); 
	  try 
	  { // Exception Possible area
	  System.out.println("Enter two no.s ");
	  int no1 = sc.nextInt(); 
	  int no2 = sc.nextInt(); 
	  System.out.println(no1/no2);
	  try {
	  int[] ar = new int[no1];
	  System.out.println(ar[0]);
	  }
	  catch(NegativeArraySizeException ne)
	  {
	   System.out.println("Please check array length");
	  }
	  }
	  catch(Exception e)
	  {        
	   System.out.println("Something went wrong"); 
	  }
	  System.out.println("Hi");
}

private void divide1() {
	// TODO Auto-generated method stub
	Scanner sc  = new Scanner(System.in); 
	  try { // Exception Possible area
	  System.out.println("Enter two no.s ");
	  int no1 = sc.nextInt(); 
	  int no2 = sc.nextInt(); 
	  System.out.println(no1/no2);
	  int[] ar = new int[no1];
	  System.out.println(ar[0]);
	  }
	  catch(ArithmeticException ae)
	  { // Exception Handling area
	  System.out.println("Please check no2 "); 
	  //divide(); 
	  }
	  catch(InputMismatchException ime)//two
	  {
	   System.out.println("Check inputs ");
	  }
	  catch(Exception e)//-7 , 2
	  {        
	   System.out.println("Something went wrong"); 
	  }
	  System.out.println("Hi");
	  
	 
}
}

Outputs:

getPassword:

enter password

1234
Less than 8 Exception

checkedExceptionDemo:

Please check file location

divide3:

Check Check
finally block
Proceed further

divide2:

1
-6
0
0
Hi

divide1:

Enter two no.s
1
two
Check inputs
Hi

package patterns1;

public class PwdException extends Exception {
	//If this class is sub class RuntimeException - UnCheckedException
		//Otherwise, it is Checked Exception
		public PwdException(String message)
		{
			System.out.println(message);
		}
}