I'm not getting something. String == String False

Question

Why is this False? I can't get it. DataBaseHelper.getBoolean(); is a string value. In this if statement it outputs the same result but it says it is not equal with each other..

            String a = DataBaseHelper.getBoolean(id);
            String b = DataBaseHelper.getBoolean(id);
            if (a==b){
                newTextView.setText(DataBaseHelper.getBoolean(id) + " == " + DataBaseHelper.getBoolean(id) + " is TRUE \n");
            } else {
                newTextView.setText(DataBaseHelper.getBoolean(id) + " == " + DataBaseHelper.getBoolean(id) + " is FALSE \n");
            }

getBoolean method from toher class.

public String getBoolean(int randomIndex) {
        // TODO Auto-generated method stub
        open();
        Cursor c = myDataBase.query(TABLE_NAME1, columns, WHATTODONOW_COLUMN_ID
                + "=" + randomIndex, null, null, null, null);
        if (c != null) {
            c.moveToFirst();
            String text = c.getString(8);
            return text;
        }
        closee();
        return null;
    }

Comparing a string value by using `==` will not work, use `equals()` method. — Glenn, Jun 18 '13 at 10:42

Blackbelt · Accepted Answer · 2013-06-18T10:52:09.243

2

because String a and String b objects are different (== test for reference equality). you should compare String instance through equals

if (a.equals(b)) {}

edited Jun 18 '13 at 10:52

answered Jun 18 '13 at 10:40

Blackbelt

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Strange. Actually that is not `address`. This is because of `a` and `b` both are different object. – Pankaj Kumar Jun 18 '13 at 10:48
It was what I meant. Your definition is more clear, thanks @PankajKumar – Blackbelt Jun 18 '13 at 10:52
No concept of address in Java. BTW most welcome – Pankaj Kumar Jun 18 '13 at 10:56

score 1 · Answer 2 · answered Jun 18 '13 at 10:41

1

You should use a.equals(b) or a.equalsIgnoreCase(b) instead of == operator to compare String. == operator compares the references of the two operands. Your a and b are different String objects hence it fails .

answered Jun 18 '13 at 10:41

AllTooSir

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score 1 · Answer 3 · answered Jun 18 '13 at 10:42

1

Try with one of following

if (a.equals(b)) {}

And

if (a.equalsIgnoreCase(b)) {}

answered Jun 18 '13 at 10:42

Hardik Joshi

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I'm not getting something. String == String False

3 Answers3