An introduction to Exception Handling

Exception:

"An exception is an event or condition which interrupted the normal flow of program execution.Which causes the program termination abnormally." Example : FileNotFoundException,ArithmeticException and NullPointerException etc.

Demo program based on ArithmeticException:

package com.navneet.javatutorial;
public class ExceptionIntroduction {

public static void main(String[] args) {

m1();
}

public static void m1(){

int var1=12;
int var2=0;
int c=var1/var2;
System.out.print(c);
m2();

}
public static void m2(){

System.out.print("Method m2 statement");

}

}
Console Output:
Exception in thread "main" java.lang.ArithmeticException: / by zero
at com.navneet.javatutorial.ExceptionIntroduction.m1(ExceptionIntroduction.java:16)
at com.navneet.javatutorial.ExceptionIntroduction.main(ExceptionIntroduction.java:6)

 

The last two lines show that the method m2() not executed and the program terminates abnormally.

To avoid such conditions, exception handling comes to the picture.