React JS - State with class component

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App.js - 


import './App.css';
import React, {useState, Component} from 'react';

class App extends Component{

  constructor(){
    super();
    this.state={data:"Krishan"}
  }
  fun2(){
    this.setState({data:"Dev"})
  }
  render(){
    return(
      <div>
        <h1>{this.state.data}</h1>
        <button onClick={()=>this.fun2()}>Click Me</button>
      </div>
    )
  }
}
export default App;


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