JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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How To Create URL Object by passing protocol, host, port and path in Java?


Description:

The URL class provides additional constructor for creating a URL object. This constructor is useful when you are working with URLs, such as HTTP URLs, that have host name, filename, port number, and reference components in the resource name portion of the URL. This constructor is useful when you do not have a String containing the complete URL specification, but you do know various components of the URL.


Code:
package com.myjava.url;

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

public class MyUrlConstruct {

    public static void main(String a[]){
    
        try {
            String protocol = "http";
            String host = "www.java2novice.com";
            int port = 80;
            String path = "/java_thread_examples/";
            URL url = new URL(protocol, host, port, path);
            System.out.println(url.toString());
        } catch (MalformedURLException ex) {
            ex.printStackTrace();
        }
    }
}

Example Output

http://www.java2novice.com:80/java_thread_examples/

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Knowledge Centre
Difference between Enumeration and Iterator
The functionality of Enumeration and the Iterator are same. You can get remove() from Iterator to remove an element, while while Enumeration does not have remove() method. Using Enumeration you can only traverse and fetch the objects, where as using Iterator we can also add and remove the objects. So Iterator can be useful if you want to manipulate the list and Enumeration is for read-only access.
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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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