What Are Exceptions?
Exceptions are unexpected events that disrupt the normal flow of a program. In Java, exceptions provide a structured way to signal and handle these unusual conditions, allowing your code to react gracefully when something goes wrong. Rather than letting your program crash or behave unpredictably, you can use exceptions to detect problems and decide how to handle them.
It is important to distinguish between exceptions and errors in Java. Exceptions are conditions that a program might want to catch and handle, such as invalid input or a missing file. Errors, on the other hand, represent serious problems that are usually outside the control of your program, like running out of memory. Exception handling is necessary because it enables your program to recover from or respond to problems without abruptly terminating, improving both reliability and user experience.
Main.java
12345678910package com.example; public class Main { public static void main(String[] args) { int numerator = 10; int denominator = 0; int result = numerator / denominator; // This line will throw an exception System.out.println("Result: " + result); } }
In this code, the statement int result = numerator / denominator; attempts to divide 10 by 0. Since dividing by zero is not allowed in Java, the program throws an ArithmeticException at this line. Because there is no code to handle the exception, the program will terminate immediately, and the message about the result will never be printed. This demonstrates how exceptions can interrupt the normal execution of your code if they are not properly managed.
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Exceptions are unexpected events that disrupt the normal flow of a program. In Java, exceptions provide a structured way to signal and handle these unusual conditions, allowing your code to react gracefully when something goes wrong. Rather than letting your program crash or behave unpredictably, you can use exceptions to detect problems and decide how to handle them.
It is important to distinguish between exceptions and errors in Java. Exceptions are conditions that a program might want to catch and handle, such as invalid input or a missing file. Errors, on the other hand, represent serious problems that are usually outside the control of your program, like running out of memory. Exception handling is necessary because it enables your program to recover from or respond to problems without abruptly terminating, improving both reliability and user experience.
Main.java
12345678910package com.example; public class Main { public static void main(String[] args) { int numerator = 10; int denominator = 0; int result = numerator / denominator; // This line will throw an exception System.out.println("Result: " + result); } }
In this code, the statement int result = numerator / denominator; attempts to divide 10 by 0. Since dividing by zero is not allowed in Java, the program throws an ArithmeticException at this line. Because there is no code to handle the exception, the program will terminate immediately, and the message about the result will never be printed. This demonstrates how exceptions can interrupt the normal execution of your code if they are not properly managed.
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