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Thread: Checking if input value is in an array

  1. #1
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    Default Checking if input value is in an array

    Hi
    So I'm trying to make a somewhat simple Android application.
    A user enters a value in a numberbox.
    The program checks if that number is in an array.
    If it is, in a textbox it says "Yes" if it isn't, in the same text box it says "No"




    public class MainActivity extends AppCompatActivity {
     
        private Integer enterDate; private Button btnCheck; private TextView resVal;
     
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
            setSupportActionBar(toolbar);
     
            enterDate = (Integer) findViewById(R.id.enterDate);
            btnCheck = (Button) findViewById(R.id.btnCheck);
            resVal = (TextView) findViewById(R.id.resVal);
     
            btnCheck.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
     
                    Integer[] array = {1,3,5,7};
                    Set<Integer> set = new HashSet<Integer>(Arrays.asList(array));
                    boolean enterDate = set.contains(enterDate);
                    if(enterDate) {
                        resVal.setText("Yes");
                    }else {
                                resVal.setText("No");
                            }
                        }
                }
        }});

    I'm getting three errors:

    error: ')' expected
    error: illegal start of type
    error: reached end of file while parsing

    They all point me to the last line of code
    Attached Images Attached Images
    Last edited by tetanusot; October 9th, 2018 at 06:10 PM.

  2. #2
    Member John Joe's Avatar
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    Default Re: Checking if input value is in an array

    You are declared enterDate as integer, so just initialized it like this
    int enterDate = 0

    Below code is not needed.
    enterDate = (Integer) findViewById(R.id.enterDate);
    Whatever you are, be a good one

  3. #3
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    Default Re: Checking if input value is in an array

    Quote Originally Posted by John Joe View Post
    You are declared enterDate as integer, so just initialized it like this
    int enterDate = 0

    Below code is not needed.
    enterDate = (Integer) findViewById(R.id.enterDate);
    Thanks for your reply.
    I deleted this line
    enterDate = (Integer) findViewById(R.id.enterDate);
    but where do I put this?
    int enterDate = 0
    and by the way, this enterDate variable is actually the number that I want to get from input in the numberbox

  4. #4
    Member John Joe's Avatar
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    Default Re: Checking if input value is in an array

    and by the way, this enterDate variable is actually the number that I want to get from input in the numberbox
    Then you need to add an editText, and then assign the input to enterDate variable when button is clicked.

    See the example below

    public class MainActivity extends AppCompatActivity {
     
        private Button btnCheck;
        private TextView resVal;
        private EditText editText;
     
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
            setSupportActionBar(toolbar);
     
            editText = (EditText) findViewById(R.id.editText);  // create an editText
     
            btnCheck = (Button) findViewById(R.id.btnCheck);
            resVal = (TextView) findViewById(R.id.resVal);
     
            btnCheck.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
     
                    Integer[] array = {1, 3, 5, 7};
                    Set<Integer> set = new HashSet<Integer>(Arrays.asList(array));
     
                    String enterDate = editText.getText().toString();    // get the input from editText, then assign to enterDate variable
                    int value = Integer.parseInt(enterDate);
     
                    boolean enterDate1 = set.contains(value);
                    if (enterDate1) {
                        resVal.setText("Yes");
                    } else {
                        resVal.setText("No");
                    }
                }
     
            });
        }
    }
    Last edited by John Joe; October 10th, 2018 at 03:38 AM.
    Whatever you are, be a good one

  5. #5
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    Default Re: Checking if input value is in an array

    Quote Originally Posted by John Joe View Post
    Then you need to add an editText, and then assign the input to enterDate variable when button is clicked.

    See the example below

    public class MainActivity extends AppCompatActivity {
     
        private Button btnCheck;
        private TextView resVal;
        private EditText editText;
     
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
            setSupportActionBar(toolbar);
     
            editText = (EditText) findViewById(R.id.editText);  // create an editText
     
            btnCheck = (Button) findViewById(R.id.btnCheck);
            resVal = (TextView) findViewById(R.id.resVal);
     
            btnCheck.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
     
                    Integer[] array = {1, 3, 5, 7};
                    Set<Integer> set = new HashSet<Integer>(Arrays.asList(array));
     
                    String enterDate = editText.getText().toString();    // get the input from editText, then assign to enterDate variable
                    int value = Integer.parseInt(enterDate);
     
                    boolean enterDate1 = set.contains(value);
                    if (enterDate1) {
                        resVal.setText("Yes");
                    } else {
                        resVal.setText("No");
                    }
                }
     
            });
        }
    }
    This returns an error
    error: cannot find symbol variable editText


    I just changed the ID attribute in content and it worked.
    I really appreciate your help.
    Thanks a TON!
    Last edited by tetanusot; October 10th, 2018 at 06:36 AM.

  6. #6
    Member John Joe's Avatar
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    Default Re: Checking if input value is in an array

    You''re welcome
    Whatever you are, be a good one

  7. #7
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    Default Re: Checking if input value is in an array

    Please check the last line where you have put a curly brace and a semi colon.

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