Why does String.replace not work?

Question

I am a little bit confused at the moment. I tried that:

String test = "KP 175.105";
test.replace("KP", "");
System.out.println(test);

and got:

KP 175.105

However, I want:

175.105

What's wrong with my code?

btw sorry for my stupid question. I guess its time to go to bed... — maximus, Mar 16 '13 at 14:40
This question may be a duplicate, but it is much easier to understand than the one it is supposedly a duplicate of. — Suragch, May 04 '15 at 03:42

score 146 · Accepted Answer · edited Feb 27 '20 at 03:25

146

You did not assign it to test. Strings are immutable.

test = test.replace("KP", "");

You need to assign it back to test.

edited Feb 27 '20 at 03:25

shmosel

answered Mar 16 '13 at 14:37

PSR

5

You have no idea how much anguish you saved me. TYSM – Brenann Sep 23 '18 at 01:38
not working for "...","" – withoutOne Dec 03 '19 at 11:26

score 19 · Answer 2 · answered Mar 16 '13 at 14:36

19

Strings are immutable so you need to assign your test reference to the result of String.replace:

test = test.replace("KP", "");

answered Mar 16 '13 at 14:36

Reimeus

score 7 · Answer 3 · answered Mar 16 '13 at 14:38

7

String is immutable in java so you have to do

test =test.replace("KP", "");

answered Mar 16 '13 at 14:38

Achintya Jha

3 Answers3