问当点击第三个孩子的按钮时，我如何调用另一个孩子的方法？

EN

class Main extends Component{
  constructor(){
    super();
    this.state = {
      amount: 10,
    };
  }

  handleOnPayButtonClick = () => {
// here I should be able to runValidations on both the children
    this.setState({
      amount: 20,
    });
  }

render(){
  <Addresss />
  <PaymentDetails />
  <PayButton
      onPayButtonClicked={() => this.handleOnPayButtonClick()}
  />
}
}

class Address extends Component{

  runValidation = ()=>{
// validations for this component state
  }
......
}

class PaymentDetails extends Component{

  runValidation = ()=>{
// validations for this component state
  }
......
}

class PayButton extends Component{
   <Button onClick={props ? props.onPayButtonClicked : undefined}>
}```

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