Help on task 3

Question

int cannot be dereferenced error

LandingActivity.java

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class LandingActivity extends Activity {

    public Button mThrustButton;
    public TextView mTypeLabel;
    public EditText mPassengersField;

    public Spaceship mSpaceship;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_landing);
      mSpaceship = new Spaceship("FIREFLY");


        mThrustButton = (Button)findViewById(R.id.thrustButton);
        mTypeLabel = (TextView)findViewById(R.id.typeTextView);
        mPassengersField = (EditText)findViewById(R.id.passengersEditText);

        mTypeLabel.setText(mSpaceship.getType());


       mPassengersField = (mSpaceship.getNumPassengers().toString());


      // Add your code here!
    }
}

Spaceship.java

public class Spaceship {
    private String mType;
    private int mNumPassengers = 0;

    public String getType() {
      return mType;
    }

    public void setType(String type) {
      mType = type;
    }

    public int getNumPassengers() {
      return mNumPassengers;
    }

    public void setNumPassengers(int numPassengers) {
      mNumPassengers = numPassengers;
    }

    public Spaceship() {
      mType = "SHUTTLE";
    }

    public Spaceship(String type) {
      mType = type;
    }
}

Answer 1 · 2014-12-18T20:02:12Z

December 18, 2014 8:02pm

First, you need to use the .setText() method:

mPassengersField.setText();

Also, you can't cast an int to a String like that. The toString method is a feature of the Integer class, and thus only works with Integer objects, not with primitive ints.

You could solve this in a couple of ways. First, you could concatenate the integer value with on empty string:

"" + mSpaceship.getNumPassengers();

The other way is to cast the int to an Integer, and then apply the .toString() method:

((Integer)mSpaceship.getNumPassengers()).toString();

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drizzy drake

drizzy drake

Help on task 3

1 Answer

Mikael Enarsson

Mikael Enarsson