Reputation: 1353

How to cast a string to an URL in java?

My java code is below.I wrote url=URL(s); but it is not true.I want to make a casting operation to convert a string that is taken from the user ,to an URL.How can I do this operation?Is there any method to do this?

    public static void main(String[] args) {
    System.out.println("Welcome to Download Manager");
    URL url;
    String s;
    Scanner scan= new Scanner(System.in);
    s=scan.nextLine();
    url=URL(s);
    Download download=new Download(url);
}

Upvotes: 27

Answers (6)

Evandro Pomatti

Reputation: 15144

As of Java 20, the URL constructor has been deprecated and developers who still need to use URL are now encouraged to adtop the java.net.URI class:

If you know the input, you can use the java.net.URI::create method instead:

URL url = URI.create(s).toURL();

This method works the same behavior as the constructor, with a twist:

This method is provided for use in situations where it is known that the given string is a legal URI, for example for URI constants declared within a program, and so it would be considered a programming error for the string not to parse as such.

Upvotes: 1

ofskyMohsen

Reputation: 1211

You should first convert your string into a URI , then convert the URI into a URL .

For example:

String str = "http://google.com";
URI uri = new URI(str);
URL url = uri.toURL();

Please note, there are 2 unhandled exceptions; so you should wrap the above code within 2 try/catch statements.

Upvotes: 10

Lazy Senior

Reputation: 171

Use the URL constructor

public static void main(String[] args) {
        System.out.println("Welcome to Download Manager");
        URL url;
        String s;
        Scanner scan= new Scanner(System.in);
        s=scan.nextLine();
        url= new URL(s);
        Download download=new Download(url);
    }

Upvotes: 7

Grzegorz Olszewski

Reputation: 1428

You can't cast String to URL, since String is not a subclass of URL. You can create new instance of URL, passing String as argument to the constructor. In Java, you always invoke constructor using keyword new: