java code for coffee

MainActivity.java

/**
 * Add your package below. Package name can be found in the project's AndroidManifest.xml file.
 * This is the package name our example uses:
 *
 * package com.example.android.justjava;
 */

package  com.example.andriod.jusjava;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.TextView;
import java.text.NumberFormat;
import java.lang.String;

import static android.R.id.message;

/**
 * This app displays an order form to order coffee.
 */
public class MainActivity extends AppCompatActivity {

    int numberOfCoffees = 0;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    /**
     * This method is called when the order button is clicked.
     */

    public void increment(View view)
    {
        numberOfCoffees = numberOfCoffees + 1 ;
        display(numberOfCoffees);

    }
    public void decrement(View view)
    {

        numberOfCoffees = numberOfCoffees - 1  ;
        display(numberOfCoffees);

    }

    public void submitOrder(View view)
    {
        String priceMessage = "₹ " + (numberOfCoffees * 5) +  "\n Thank you!";
        displayMessage(priceMessage);

    }
    /**
     * This method displays the given quantity value on the screen.
     */
    private void display(int number) {
        TextView quantityTextView = (TextView) findViewById(R.id.quantity_text_view);
        quantityTextView.setText("" + number);
    }

    /**
     * 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));
    }
    /**
     * This method displays the given text on the screen.
     */
    private void displayMessage(String message) {
        TextView priceTextView = (TextView) findViewById(R.id.price_text_view);
        priceTextView.setText(message);
    }

}