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To access a URL within a class component, you can use the "window.location.href" property.

For example, to display the current URL in a class component, you can create a method that returns the current URL and call it in the render method. Here's how you can do it:

class MyComponent extends React.Component {
    getCurrentUrl = () => {
        return window.location.href;
    }

    render() {
        const url = this.getCurrentUrl();
        return (
            <div>
                <p>The current URL is: {url}</p>
            </div>
        );
    }
}

This will display the current URL in the component.