Pattern for Try Catch Do Again

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What are endeavor, catch, finally blocks in Coffee?

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An exception is an consequence (run fourth dimension error) occurred during the execution of a programme. For understanding purpose let us look at it in a different manner.

Generally, when you compile a program, if information technology gets compiled without a .class file will be created, this is the executable file in Java, and every fourth dimension you execute this .course file it is supposed to run successfully executing each line in the plan without any problems. Just, in some exceptional cases, while executing the programme, JVM encounters some ambiguous scenarios where it doesn't know what to practise.

Here are some example scenarios −

• If yous have an array of size 10 if a line in your lawmaking tries to access the 11th element in this array.
• If yous are trying to dissever a number with 0 which (results to infinity and JVM doesn't understand how to valuate information technology).

Generally, when exception occurs the program terminates abruptly at the line that acquired exception, leaving the remaining office of the program unexecuted. To foreclose this, you demand to handle exceptions.

Effort, catch, finally blocks

To handle exceptions Java provides a endeavor-grab block mechanism.

A try/catch cake is placed around the code that might generate an exception. Code inside a attempt/take hold of cake is referred to as protected code.

Syntax

try {    // Protected code } catch (ExceptionName e1) {    // Grab block }

When an exception raised inside a attempt block, instead of terminating the program JVM stores the exception details in the exception stack and proceeds to the take hold of block.

A catch statement involves declaring the blazon of exception you lot are trying to take hold of. If an exception occurs in the endeavor cake information technology is passed to the catch block (or blocks) that follows it.

If the type of exception that occurred is listed in a catch block, the exception is passed to the take hold of block much as an argument is passed into a method parameter.

Instance

import java.io.File; import java.io.FileInputStream; public class Examination {    public static void principal(String args[]){       Organisation.out.println("Hello");       try{          File file =new File("my_file");          FileInputStream fis = new FileInputStream(file);       }catch(Exception due east){          System.out.println("Given file path is not found");       }    } }

Output

Given file path is non found

The finally block follows a endeavour block or a grab block. A finally block of code always executes, irrespective of occurrence of an Exception.

Example

public form ExcepTest {    public static void main(Cord args[]) {       int a[] = new int[2];       try {          System.out.println("Access element three :" + a[iii]);       } catch (ArrayIndexOutOfBoundsException e) {          System.out.println("Exception thrown :" + eastward);       }finally {          a[0] = vi;          System.out.println("First element value: " + a[0]);          System.out.println("The finally statement is executed");       }    } }

Output

Exception thrown : java.lang.ArrayIndexOutOfBoundsException: 3 Get-go element value: 6 The finally statement is executed

Published on 06-Aug-2019 08:43:00

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Source: https://www.tutorialspoint.com/what-are-try-catch-finally-blocks-in-java

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