JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Java Exception Handling - Multiple Cache Blocks Examples

  • A single try block can have multiple catch blocks. This is required when the try block has statements that generates different types of exceptions.
  • If the first catch block contains the Exception class object then the subsequent catch blocks are never executed.
  • The last catch block in multiple catch blocks must contain the Exception class object. This is because, the java complier gives an error saying that the subsequent catch blocks haven't been reached. This is known as Unreachable code problem.

Multiple Cache Blocks Sample Code

Code:
package com.myjava.exceptions;

import java.net.MalformedURLException;
import java.net.URL;

public class MyMultipleCatchBlocks {
    
    public static void main(String a[]){
        MyMultipleCatchBlocks mmcb = new MyMultipleCatchBlocks();
        mmcb.execute(1);
        mmcb.execute(2);
    }
    
    public void execute(int i){
        try{
            if(i == 1){
                getIntValue("7u");
            } else {
                getUrlObj("www.junksite.com");
            }
        } catch (NumberFormatException nfe){
            System.out.println("Inside NumberFormatException... "+nfe.getMessage());
        } catch (MalformedURLException mue){
            System.out.println("Inside MalformedURLException... "+mue.getMessage());
        } catch (Exception ex){
            System.out.println("Inside Exception... "+ex.getMessage());
        }
    }
    public int getIntValue(String num){
        return Integer.parseInt(num);
    }
    
    public URL getUrlObj(String urlStr) throws MalformedURLException{
        return new URL(urlStr);
    }
}

Example Output

Inside NumberFormatException... For input string: "7u"
Inside MalformedURLException... no protocol: www.junksite.com

Other Exception Handling Examples

Knowledge Centre
doPost Vs doGet methods
doGet() method is used to get information, while doPost() method is used for posting information. doGet() requests can't send large amount of information and is limited to 240-255 characters. However, doPost()requests passes all of its data, of unlimited length. A doGet() request is appended to the request URL in a query string and this allows the exchange is visible to the client, whereas a doPost() request passes directly over the socket connection as part of its HTTP request body and the exchange are invisible to the client.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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