Java program for user defined exception

//user defined exception in Java

Description

This program demonstrates the working of user defined exception in Java. The class which handles the user defined exception must extend the Exception class, here the class is Empid which contains the constructor Empid(). The class Employee contains the constructor Employee() which takes as input name, department and employee id. The display() function calls the user defined exception if employee id less than or equal to 0, otherwise it will print both these values.  

Program

class Empid extends Exception

{

Empid()    //Defining user defined exception

{

System.out.println("Empid Cannot be negative");

}

}

class Employee

{

String name,dept;

int empid;

public Employee(String name,String dept,int empid)

{

this.name=name;

this.dept=dept;

this.empid=empid;

}

public void display() throws Empid

{

if(empid <= 0)

throw new Empid();

else

System.out.println("Emp id= "+empid+"  Name= "+name+"  Dept= "+dept);

}

}

public class Emp

{

public static void main(String s[])

{

Employee e1=new Employee("Jibin","EC",4);

Employee e2=new Employee("Amal","ME",-5);

try

{

e1.display();

e2.display();

}

catch(Exception ex)

{

System.out.println("Error");         

}

}

}

Output

Java:  user defined exception