如何在Java中随机选择按钮文本？

Question

Friends,

I am a Civil Engineer. Now i am working now in Android Developing. I know Java and C# but i am mentally set my Programming knowledge is only editing like Reading and Understand. How to increase my skill like writing Programs Specially for C# and Java.

Thank You.

then its my Question..

For example I have 3 buttons and 3 int values.

How to make buttons text randomly choose from 3 int values string while button click.

It's a Simple maths game for Android Platforms.

        TextView textA = (TextView) findViewById(R.id.textView);
        TextView textB = (TextView) findViewById(R.id.textView3);
        final Button button1 = (Button) findViewById(R.id.button1);
        final Button button2 = (Button) findViewById(R.id.button2);
        final Button button3 = (Button) findViewById(R.id.button3);


        Random rand = new Random();
        final int x = rand.nextInt(1000);
        Random randB = new Random();
        int y = randB.nextInt(1000);
        Random randw = new Random();
        int w = randw.nextInt(1000);
        Random randz = new Random();
        int z = randz.nextInt(1000);

        int A = x;
        int B = y;
        int Wrong1 = (A + w);
        int Wrong2 = (A + z);
        final int CorrectAnswer = (A + B);

        String text = "text";
        Button[] arr = {button1, button2, button3};
        Random r = new Random();
        Button b = arr[r.nextInt(arr.length)];
        b.setText(text);

        int Ans1 = CorrectAnswer;
        int Ans2 = Wrong1;
        int Ans3 = Wrong2;


        textA.setText("" + A);
        textB.setText("" + B);
        button1.setText("" + Wrong1);
        button2.setText("" + Wrong2);
        button3.setText("" + CorrectAnswer);
        final int ACAns;
        ACAns = Integer.parseInt(button3.getText().toString());
        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                int AAns = Integer.parseInt(button1.getText().toString());


                if ((AAns == ACAns)) {
                    Toast.makeText(getBaseContext(), "Your answer is correct!", Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(getBaseContext(), "Your answer is Wrong!", Toast.LENGTH_SHORT).show();
                }

            }
        });
        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                int BAns = Integer.parseInt(button2.getText().toString());
                int ACAns = Integer.parseInt(button1.getText().toString());
                if ((BAns == ACAns)) {
                    Toast.makeText(getBaseContext(), "Your answer is correct!", Toast.LENGTH_SHORT).show();
                } else {
                    }    
            }
        });
        button3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                int CAns = Integer.parseInt(button3.getText().toString());
                int ACAns = Integer.parseInt(button3.getText().toString());
                if ((CAns == ACAns)) {
                    Toast.makeText(getBaseContext(), "Your answer is correct!", Toast.LENGTH_SHORT).show();                      

                    return;
                } else {
                    Toast.makeText(getBaseContext(), "Your answer is Wrong!", Toast.LENGTH_SHORT).show();
                }

Answer 1

Take two arrays.

String buttonNamesArray[] = {"name1", "name2", "name3"};
int indexArray[] = {0, 1, 2};

Now generate a random number by any logic and do a modulus by 3 (length of indexArray) operation to get an index in the range [0-2]. Now do

randomIndex = randomNumber % 3;
if(indexArray[randomIndex] != -1) {
    //assign the next button value buttonNamesArray[randomIndex]
    indexArray[randomIndex] = -1;
}

Perform this in a loop until all buttons are not over.

This is just the logic and not the actual code.

Answer 2

Store the string values in an array of size 3. Generate a random number between 0 and 2. Keep that value in a variable and assign the string associated to that value to your button. Reduce your array by deleting the string you've already assigned. Then generate a random int between 0 and 1. Assign again to a button. Delete the element you've just assigned and finally assign the last string value to your last button.

Sorry for the lack of code but I'm on my phone, it's not really easy to code on phones.

Hope this helps