Q. Write a Java program which creates only one object. If user attempts to create second object, he should not be able to create it. (Using Exception Handling).
Answer:
This example shows that how to create custom exception in java. When user try to create more than one object, it throws exception.
Output:
when we try to run this program it generates the exception.
NotMoreException: No more than 1 object
Answer:
This example shows that how to create custom exception in java. When user try to create more than one object, it throws exception.
NotMoreException.java
class NotMoreException extends Exception
{
NotMoreException()
{
super("No more than 1 object");
}
}
Test.java
class Test
{
static int cnt=0;
Test() throws NotMoreException
{
if (cnt == 0)
{
cnt++;
}
else
throw new NotMoreException();
}
}
Demo.java
class Demo
{
public static void main(String[] args)
{
try
{
Test t1 = new Test();
Test t2 = new Test();
Test t3 = new Test();
}
catch (NotMoreException ex)
{
System.out.println(ex);
}
}
}
Output:
when we try to run this program it generates the exception.
NotMoreException: No more than 1 object
