Java KeyEvent - why "Unknown" != "Unknown"?

Question

Why does

KeyEvent.getKeyText(0).substring(0, 7) == "Unknown"

return false when

System.out.print(KeyEvent.getKeyText(0).substring(0, 7));

prints exactly "Unknown"?

score 2 · Accepted Answer · edited May 23 '17 at 11:51

2

In Java Strings are objects, so you should not compare with ==. You have to call equals on strings to compare there content. If you compare them with == you compare them by reference.

KeyEvent.getKeyText(0).substring(0, 7).equals("Unknown");

An alternative would be contains:

KeyEvent.getKeyText(0).contains("Unknown");

See this post: Java String.equals versus ==

edited May 23 '17 at 11:51

Community

1
1

answered Jul 26 '15 at 13:44

morpheus05

4,772
2
32
47

4

You *can* compare with `==`, but it compares the references, that's all. – Jon Skeet Jul 26 '15 at 13:44

Java KeyEvent - why "Unknown" != "Unknown"?

1 Answers1