LoadData-SharedPreference

package zihadrizkyef.learn.sharedpreferences;

import android.content.Context;
import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Button;

import android.widget.TextView;
public class LoadData extends AppCompatActivity{
    TextView tvName, tvAge, tvEmail;
    Button bBack;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_load_data);

        tvName = (TextView) findViewById(R.id.tvName);
        tvAge = (TextView) findViewById(R.id.tvAge);
        tvEmail = (TextView) findViewById(R.id.tvEmail);
        bBack = (Button) findViewById(R.id.bBack);

        SharedPreferences sharedPreferences = getSharedPreferences("test.sp", Context.MODE_PRIVATE);
        tvName.setText("Name : "+sharedPreferences.getString("key", "''"));
        tvAge.setText("Age : "+sharedPreferences.getString("age", "''"));
        tvEmail.setText("Email : "+sharedPreferences.getString("email", "''"));
//        tvName.setText("Name : "+sharedPreferences.getString("name", "N/A"));
//        tvAge.setText("Age : "+String.valueOf(sharedPreferences.getInt("age", 0)));
//        tvEmail.setText("Email : "+sharedPreferences.getString("email", "N/A"));
    }
}