The difference between java and kotlin in android studio

Java makes your line of code very long while kotlin makes it short and simple
 see below how to add a click event a button using java and kotlin

Java button click event

Button btn1 = (Button)findViewById(R.id.button1);

btn1.setOnClickListener(new View.OnClickListener() {            
    @Override
    public void onClick(View v) {
//your stuff here.
    }
});

Kotlin button click event

Val btn1 = findViewById<View>(R.id.button1) as Button

btn1.setOnClickListener {            
    
//your stuff here.
    }