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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Knowledge Centre
What is race condition?
A race condition is a situation in which two or more threads or processes are reading or writing some shared data, and the final result depends on the timing of how the threads are scheduled. Race conditions can lead to unpredictable results and subtle program bugs. A thread can prevent this from happening by locking an object. When an object is locked by one thread and another thread tries to call a synchronized method on the same object, the second thread will block until the object is unlocked.

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