How to Create User Defined Exception in Java

Apart from existing Exceptions in java, we can create our own Exceptions (User defined exceptions in java), we will how to..

Required files

• Client.java [ My business logic will goes here ]
• MyOwnExceptionClass.java  [ This is our own Exception class ]

Note: Our user defined class must extend from Exception class, and we must override the toString() method to display our exception message.

Client.java

package java4s; public class Client { public static void main(String[] args)throws Exception { int price = -120; if(price < 0) throw new MyOwnExceptionClass(price); else System.out.println("Your age is :"+price); } }

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package java4s; public class Client { public static void main(String[] args)throws Exception {    int price = -120;    if(price < 0)       throw new MyOwnExceptionClass(price);    else       System.out.println("Your age is :"+price);    } }

MyOwnExceptionClass.java

package java4s; public class MyOwnExceptionClass extends Exception { private int price; public MyOwnExceptionClass(int price){ this.price = price; } public String toString(){  return "Price should not be in negative, you are entered" +price; } }

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package java4s; public class MyOwnExceptionClass extends Exception {     private int price;     public MyOwnExceptionClass(int price){         this.price = price;     }     public String toString(){         return "Price should not be in negative, you are entered" +price;     } }