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

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Other Exception Handling Examples

Knowledge Centre
Inner class and Anonymous class
Inner class: classes defined in other classes, including those defined in methods are called inner classes. An inner class can have any accessibility including private.

Anonymous class: Anonymous class is a class defined inside a method without a name and is instantiated and declared in the same place and cannot have explicit constructors.

About Author

My name is 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 at java2novice@gmail.com or you can comment on the page.

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Reference: Java™ Platform Standard Ed. 6 - API Specification | Java is registered trademark of Oracle.
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