JustJava java code

gistfile1.txt

package com.example.android.justjava;

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

public class MainActivity extends AppCompatActivity {
    int numberOfCoffees = 0;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        display(numberOfCoffees);
    }



    public void submitOrder(View view) {
        display(numberOfCoffees);
        displayPrice(numberOfCoffees*3);
    }


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

    public void quantityMines(View view) {
        if(numberOfCoffees != 0)
        {
            numberOfCoffees = numberOfCoffees - 1;
        }

        display(numberOfCoffees);
    }
    /**
     * 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));
    }
}