New method in MainActivity.java

/**
 * This method displays the given price on the screen.
 */
private void displayPrice(int number) {
       TextView priceTextView = (TextView) findViewById(R.id.price_text_view);
       priceTextView.setText(NumberFormat.getCurrencyInstance().format(number));
}

error: invalid method declaration; return type required
} displayPrice(2*5);
^

don't why my app is crashing after clicking on the ORDER button

How do I resolve this error?

Code of [chetan081] approach

private void displayPrice(int number) {
TextView priceTextView = (TextView) findViewById(R.id.price);
priceTextView.setText("₹ "+ number);
}

How do i resolve this error

After latest update of Android studio it should be this code in Kotlin:

/**
* This method displays the given price on the screen.
*/
private fun displayPrice(number: Int) {
val priceTextView = findViewById(com.example.justjava.R.id.price_text_view) as TextView
priceTextView.setText(java.text.NumberFormat.getCurrencyInstance().format(number))
}