MainActivity.java

package com.example.android.justjava;

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.TextView;

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

    @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 submitOrder(View view) {
        display(1);
    }

    /**
     * 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);
    }
}

You'll need to update the code a bit >>

package com.example.android.justjava;

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

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

    @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 submitOrder(View view) {
        display(1);
    }

    /**
     * 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);
    }
}

The >>ActionBarActivity<< is depricated!

**change two things

1. ActionBarActivity into AppCompatActivity
2. see name of folder in java folder in project tree in which MainActivity File exists.....only that file should be while importing pakage in first line...
   This will definately help if you will reach upto here in comment #section****

I still gets an error with R . package.com.example.android.justjava is underlined... Could someone please help me ?

You need to Import your package.

very confused regarding the errors , the course is not up to date and the code in the notes does not open .
can anyone help me by telling the code i should right in my java file to make my code run without the errors. It would be great help

just change

ActionBarActivity-----------into---------- AppCompatActivity

all error solved

TO USE THIS:

package com.example.android.justjava;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

/**

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

  @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 submitOrder(View view) {
    display(1);
    }

  /**

  • 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);
    }
    }

Use this, Keep your package name unchanged.

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

/**

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

  @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 submitOrder(View view) {
    display(1);
    }

  /**

  • 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);
    }
    }