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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  7. How to read URL content?
  8. How to encode URL content?
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  10. How to get my machine IP address?
  11. How to get IP address of a host?
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Knowledge Centre
What is abstract class or abstract method?
We cannot create instance for an abstract class. We can able to create instance for its subclass only. By specifying abstract keyword just before class, we can make a class as abstract class.

public abstract class MyAbstractClass{

}

Abstract class may or may not contains abstract methods. Abstract method is just method signature, it does not containes any implementation. Its subclass must provide implementation for abstract methods. Abstract methods are looks like as given below:

public abstract int getLength();
Famous Quotations
The greatest obstacle to discovery is not ignorance; it is the illusion of knowledge.
-- Daniel J. Boorstin

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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