Android - Using Intent in an application to show another activity

In my Android application, I have two activity classes. I have a button on the first one and I want to show the second when it is clicked, but I get an error. Here are the classes:

public class FirstActivity extends Activity { 
 
  @Override 
  public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
 
    Button orderButton = (Button)findViewById(R.id.order); 
 
    orderButton.setOnClickListener(new View.OnClickListener() { 
 
      @Override 
      public void onClick(View view) { 
        Intent intent = new Intent(FirstActivity.this, OrderScreen.class); 
        startActivity(intent); 
      } 
 
    }); 
  } } 

The second class that should show when the button is clicked, but never does:

public class OrderScreen extends Activity { 
 
  @Override 
  public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.order); 
 
    Button orderButton = (Button) findViewById(R.id.end); 
 
    orderButton.setOnClickListener(new View.OnClickListener() { 
 
      @Override 
      public void onClick(View view) { 
        finish(); 
      } 
 
    }); 
  } } 

How do I create a button that will show the second activity?

 

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