CS8382-OBJECT ORIENTED PROGRAMMING LABORATORY-Create user defined Exception Handling in Java

CS8382-OBJECT ORIENTED PROGRAMMING LABORATORY


CREATE A USER DEFINED EXCEPTION HANDLING IN JAVA 

PROGRAM:


 import java.util.Scanner;
import java.io.*;
public class Demo{
public static void main(String args[]){
try {
int ch;
  System.out.println("enter\n1.arithmeticexception\n2.arrayindexOfBoundexception\n3.Nullpointerexception\n4.NumberFormtexception \n enter your choice:\n");
Scanner in=new Scanner(System.in);
ch=in.nextInt();

 switch(ch)
{

   case 1:
           int  a;
           a=args.length;
           System.out.println("a"+a);
           int b=42/a;
            break;
case 2:
           int c[]={1};
           c[42]=99;
           break;

 case 3:
             String s=null;
             System.out.println(s.length());
             break;
case 4:
              String ab;
              ab= "abc";
              int i=Integer.parseInt(ab);
              break;

 default:
        System.out.println("enter vaild input....");
}
} 
catch(ArithmeticException e)
{
System.out.println("divide by zero:"+e);
}
catch(ArrayIndexOutOfBoundsException e)
{
System.out.println("array index oob:"+e);
}
catch(NullPointerException e)
{
System.out.println("Null pointer exception"+e);
}  
catch(NumberFormatException e)
{
System.out.println("Number Formt exception"+e);
} 
}
}
--------------------------------------------------------------------
output:
enter
1.arithmeticexception
2.arrayindexOfBoundexception
3.Nullpointerexception
4.NumberFormtexception 
 enter your choice:

 1
a0

divide by zero:java.lang.ArithmeticException: / by zero
enter
1.arithmeticexception
2.arrayindexOfBoundexception
3.Nullpointerexception
4.NumberFormtexception 
 enter your choice:

 2

array index oob:java.lang.ArrayIndexOutOfBoundsException: 42

 enter
1.arithmeticexception
2.arrayindexOfBoundexception
3.Nullpointerexception
4.NumberFormtexception 
 enter your choice:

 3

Null pointer exceptionjava.lang.NullPointerException

 enter
1.arithmeticexception
2.arrayindexOfBoundexception
3.Nullpointerexception
4.NumberFormtexception 
 enter your choice:

 4

Number Formt exceptionjava.lang.NumberFormatException: For input string: "abc"
--------------------------------------------------------------------------------------------------------------------------



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