String concat doesnt work

Asked Feb 20 '16 at 16:48

Active Feb 20 '16 at 16:48

Viewed 40 times

When I use string.concat(something.toString()); it doesnt works but on the other hand if i do simple concatenation it works.

For example

Integer x = 5;
String y = "Number is : ";    
y.concat(x.toString());
System.out.println(y);

this output is >> Number is :

but if I do this >> y = y + x.toString(); the output is >> Number is : 5

asked Feb 20 '16 at 16:48

usamagk

2

String are immutable. – Tunaki Feb 20 '16 at 16:51
1

N.B: `String.concat` is the same as `+` - use that instead. – Boris the Spider Feb 20 '16 at 16:52
`concat` works, but you are using it incorrectly. You need to keep the result instead of discarding. – Peter Lawrey Feb 20 '16 at 17:58

0 Answers0