how to create custom exception? and the condition is if the string length is greater than 100, just throw exception and catch?

Question

package test2;

public class StringLargeException {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub

    }    
}

Answer 1

Simple; put the following into some Test.java ... compile and run.

class MyException extends Exception {
   MyException(String message) { super(message); }
}

public static void main(String args[]) throws Exception {
  throw new MyException("you didnt see this one coming");
}

Answer 2

1. make a class A that extends From Exception class
2. make a constructor that you can pass a message to the class
3. then when you want to throw the exception just type throw new A("Message");