View difference between Paste ID: B3FCuaG1 and MBSr4dVa

-private Stack zahlenStapel = new Stack ();
+package com.example.stackrechner;
 
 import android.support.v7.app.ActionBarActivity;
 import android.os.Bundle;
 import android.view.Menu;
 import android.view.MenuItem;
 
 private Stack zahlenStapel = new Stack ();
 
 public class MainActivity extends ActionBarActivity implements ActionListener {
 
 	@Override
 	protected void onCreate(Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);
 		setContentView(R.layout.activity_main);
 	}
 
 	@Override
 	public boolean onCreateOptionsMenu(Menu menu) {
 		// Inflate the menu; this adds items to the action bar if it is present.
 		getMenuInflater().inflate(R.menu.main, menu);
 		return true;
 	}
 
 	  public void actionPerformed(ActionEvent event) {
 		    String cmd = event.getActionCommand();
 		    if (cmd.equals("Enter")){
 		    	String strInhalt = R.layout.tfEingabe.getText();
 		        Double zahl = new Double (strInhalt);
 		        zahlenStapel.push(zahl);
 		        R.layout.tfAnzeige.setText ("");
 		      }
 	  }
 }