Why is accessing TextView of a Fragment inside Activity throwing an error

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Because fo hasn’t been initialized in the following code snippet:

FragOne fo;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    fo.setTextViewText("This is added from Activity");
    ...
}

fo.setTextViewText() reasonably throws NPE.

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