JAVA Tutorial-6

1. Program 1
2. Program 2
3. Program 3
4. Program 4

1. Write a program to insert values into an array.
The user will enter a sequence of index and value to be stored at that index on the command line.
Define your exception handlers for the following cases:
 Index is out of range.
 Value < 0 and value > 5000.
 Given index has already value stored.

 
class Exceptiondemo
{ 
 public static void main(String ar[])
 {
  int a[]=new int[Integer.parseInt(ar[0])];
  int i,j=2,k;
  try{
  
   for(i=1,k=0;i<ar.length;i+=2,k++)
   {
    a[Integer.parseInt(ar[i])]=Integer.parseInt(ar[j]);
    if(a[k]<0 || a[k]>5000)
    {
     throw new InvalidValueException();
    }
    j+=2;
   }
   for(i=0;i<a.length;i++)
   {
    System.out.println(a[i]);
   }
   
  }
  catch(ArrayIndexOutOfBoundsException e)
  {
   System.out.println("Array Index Out Of Bound Exception");
  }
  catch(InvalidValueException ex)
  {
   System.out.println(ex.toString());
  }
 }
} 
class InvalidValueException extends Exception
{
   public String toString()
   {
 return ("Invalid Value Exception / 0 value is already there in array");
   }  
}

Output

2. Write a program to get the date in form of DD MM YYYY from command line argument.
Raise and handle following custom exceptions to check the validity of the entered date.
 YearException: to check for valid four digit year.
 MonthException: to check whether the month is between 01 to 12 or not.
 DateException: to check wether date is between 01 to 31 or not.
It also checks the validity if date of month February when there is a leap year.

 
class YearException extends Exception
{
 YearException()
 {
  System.out.println("Year Exception Generated");
 }
 public String toString()
 {
  return "Invalid Year";
 }
}
class MonthException extends Exception
{
 MonthException()
 {
  System.out.println("Month Exception Generated");
 }
 public String toString()
 {
  return "Invalid Month";
 }
}
class DateException extends Exception
{
 DateException()
 {
  System.out.println("Date Exception Generated");
 }
 public String toString()
 {
  return "Invalid Date";
 }
}
class ddmmyyyy
{
   public static void main(String a[])
   {
 int yyyy=Integer.parseInt(a[2]);
 int mm=Integer.parseInt(a[1]);
 int dd=Integer.parseInt(a[0]);
 try
 {
  if(a.length==3)
  {
   //YEAR
   if(a[2].length()!=4 || yyyy<1000 || yyyy>9999)
   {
    throw new YearException();
   }
   else
   {
    System.out.println("Year: "+yyyy);
   }
   //MONTH
   if(a[1].length()!=2 || mm<01 || mm>12)
   {
    throw new MonthException();
   }
   else
   {
    System.out.println("Month: "+mm);
   }
   //DATE
   if(a[0].length()!=2)
   {
    throw new DateException();
   }
   else if(mm==01 || mm==03 || mm==05 || mm==07 || mm==8 || mm==10 || mm==12)
   {
    if(dd<01 || dd>31)
    {
     throw new DateException();
    }
    else
    {
     System.out.println("Date: "+dd);
    }
   }
   else if(mm==04 || mm==06 || mm==9 || mm==11)
   {
    if(dd<01 || dd>30)
    {
     throw new DateException();
    }
    else
    {
     System.out.println("Date: "+dd);
    }
   }
   else if(mm==02)
   {
    if((yyyy%4==0) && (yyyy%100!=0) || (yyyy%400==0))
    {
     if(dd<01 || dd>29)
     {
      throw new DateException();
     }
     else
     {
      System.out.println("Date: "+dd);
     }
    }
    else
    {
     if(dd<01 || dd>28)
     {
      throw new DateException();
     }
     else
     {
      System.out.println("Date: "+dd);
     }
    }
   }
  }
 }
 catch(YearException y)
 {
  System.out.println(y.toString());
 }
 catch(MonthException m)
 {
  System.out.println(m.toString());
 }
 catch(DateException d)
 {
  System.out.println(d.toString());
 }
   }
}

Output

3. Write a method for computing x & y by doing repetitive multiplication. x and y are of type integer and are to be given as command line arguments.
Raise and handle exception(s) for invalid values of x and y. Also define method main.

class InvalidNumberException extends Exception
{
 InvalidNumberException()
 {
  System.out.println("Power Is Negative ");
 }
}
class power
{
   public static void main(String a[])
   {
 int x=Integer.parseInt(a[0]);
 int y=Integer.parseInt(a[1]);
 int temp;
 try
 {
  if(y>=0)
  {
   if(y==0)
   {
    System.out.println(+x+" Power "+y+" is: "+1);
   }
   else
   {
    temp=x; 
    int i;
    for(i=1;i<y;i++)
    {
     temp=temp*x;
    }
    System.out.println(+x+" Power "+y+" is: "+temp);
   }
  }
  else if(y<0)
  {
   throw new InvalidNumberException();
  }
 }
 catch(InvalidNumberException i)
 {
  double temp1;
  int y1=(-y);
  temp1=1/(double)x;
  for(int j=1;j<y1;j++)
  {
   temp1=temp1*(1/(double)x);
  }
  System.out.println(+(double)x+" Power "+y+" is: "+temp1);
 }
   }
}
Output

4. Declare a class called coordinate to represent 3 dimensional Cartesian coordinates( x, y and z). Define following methods:
 Constructors.
 display method, to print values of members
 add_coordinates method, to add three such coordinate objects to produce a resultant coordinate object.
 Generate and handle exception if x, y and z coordinates of the result are zero.
 main method, to show use of above methods.

class zerovalue extends Exception{}
class coordinate
{
 float x,y,z;
 coordinate()
 {
  x=0;
  y=0;
  z=0;
 }
 coordinate(float x,float y,float z)
 {
  this.x=x;
  this.y=y;
  this.z=z;
 }
 void display()
 {
  System.out.println("X: "+x);
  System.out.println("Y: "+y);
  System.out.println("Z: "+z);
 }
 void add_coordinates(coordinate obj1,coordinate obj2)
 {
  this.x=this.x+obj1.x+obj2.x;
  this.y=this.y+obj1.y+obj2.y;
  this.z=this.z+obj1.z+obj2.z;
 }
 public static void main(String args[])
 {
  coordinate c1=new coordinate(1,1,1);
  coordinate c2=new coordinate(2,2,2);
  coordinate c3=new coordinate(-3,3,3);
  c1.add_coordinates(c2,c3);
  coordinate c4=new coordinate();
  c4=c1;
  c4.display();
  try
  {
   if(c4.x==0||c4.y==0||c4.z==0)
   {
    throw new zerovalue();
   }
  }
  catch(zerovalue r)
  {
   System.out.println("Exception.No Co-Ordinate of Resultant Object Can Be Zero");
  }
 } 
}

Output