generateoption.java

public void setRandomOptions()
{
    String[] answers = {};
    String[] options = {"PH", "USA", "NK", "SK"};

    Integer opt = 0;
    while (2 > opt) {
        String randomOption = options[new Random().nextInt(options.length)];
        
        // page eto working
        /*
        if (opt == 0) {
            b2.setText(randomOption);
        } else if (opt == 1) {
            b3.setText(randomOption);
        }
        opt++;
        */

        // eto d working pero walang error
        if (!indexExists(answers, opt)) {
            answers[opt] = randomOption;
            opt++;
        }
    }

    b2.setText(answers[0]);
    b3.setText(answers[1]);
}


public boolean indexExists(String[] array,int index){
    if(array!=null && index >= 0 && index < array.length)
        return true;
    else
        return false;
}