Ch3 Hello help

private void initDisplayButton() {
    Button displayButton = (Button) findViewById(R.id.button);
    displayButton.setOnClickListener(new OnClickListener () {

        @Override        public void onClick(View arg0) {
            EditText editName = (EditText) findViewById(R.id.editText);

            TextView textDisplay = (TextView) findViewById(R.id.textView);
            String nameToDisplay = editName.getText().toString();
            textDisplay.setText("Hello " + nameToDisplay);
        }
    });
}