react-02.jsx

// MyButton.jsx

export default class MyButton extends Component {
  render() {
    return <button>Click me!</button>
  }
}

// MyComponent.jsx
// import MyButton from "MyButton"

export class MyComponent extends Component {
  render() {
    return (
      <div className="my-div">
        My div content
        <MyButton />  
      </div>
    );
  }
}