code for random text output

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code is :

TextView tv1;Button b1;

private String jokes[] = {"text1","text2","text3","text4"};

tv1 = (TextView) findViewById(R.id.textview);b1 = (Button) findViewById(R.id.button);
b1.setOnClickListener(new View.OnClickListener() {
    @Override    public void onClick(View v) {
        Random random=new Random();        int num = random.nextInt(jokes.length);        tv1.setText(jokes[num]);    }
});