Using a dot in a string name

Question

The following line of code will not compile:

String 89.9 = new String("Hot 89.9");

It gives the following errors:

src/mainPackage/Userinterface.java:73: error: ';' expected
        String Hot89.9 = new String("Hot 89.9");
                    ^

src/mainPackage/Userinterface.java:73: error: invalid method declaration; return type required
        String Hot89.9 = new String("Hot 89.9");
                             ^

src/mainPackage/Userinterface.java:73: error: illegal start of type
        String Hot89.9 = new String("Hot 89.9");

Am I doing something wrong when I am creating my string?

here `String 89.9` instead of `89.9` there must be some variable name. you must read the variable naming convention rule. — Rustam, Oct 08 '14 at 11:29
Variable naming rules: http://docs.oracle.com/javase/tutorial/java/nutsandbolts/variables.html — Krayo, Oct 08 '14 at 11:31

Suresh Atta · Accepted Answer · 2014-10-08T11:44:50.627

3

You cannot create a variable name starting with numeric's.
You cannot use period with in the variable name in Java.

Try to change it to something else

String hot89_9= new String("Hot 89.9");

Period have a special meaning in Java (dot operator)

edited Oct 08 '14 at 11:44

answered Oct 08 '14 at 11:30

Suresh Atta

118,038
37
189
297

score 2 · Answer 2 · answered Oct 08 '14 at 11:29

2

Variable name cannot begin with a number, or contain '.' in it.

String s89_9 = new String("Hot 89.9");

answered Oct 08 '14 at 11:29

bigGuy

1,692
1
22
36

2

variable name must not contain '.`(dot) – Rustam Oct 08 '14 at 11:30

score 0 · Answer 3 · answered Oct 08 '14 at 11:29

0

You cannot have a period (dot) in a variable name

If you really want you can try this

String s89_9 = new String("Hot 89.9");

answered Oct 08 '14 at 11:29

David Pilkington

13,297
3
39
67

@TheLostMind yes why? – David Pilkington Oct 08 '14 at 11:31
89_99 is not valid variable name – bigGuy Oct 08 '14 at 11:32
@DavidPilkington because it does not compile - variable names cannot start with a numer. – l4mpi Oct 08 '14 at 11:32
@DavidPilkington - I suggest you try it again. I don't think it will compile. – TheLostMind Oct 08 '14 at 11:34

score 0 · Answer 4 · answered Oct 08 '14 at 11:29

0

Yes, you try to use a period (.) in a variable name. That is NOT allowed.

answered Oct 08 '14 at 11:29

stealthjong

10,502
13
43
83

score 0 · Answer 5 · answered Oct 08 '14 at 11:30

0

You can't have a variable name with "." and the best practice to declare a variable name is to use lower case for the first character

answered Oct 08 '14 at 11:30

Thiagz

109
1
12

score 0 · Answer 6 · answered Oct 08 '14 at 11:30

0

U cannot use dot (".") for naming in Java. Dot is for methods and properties:

Integer.valueOf("123");
String name = worger.name;

answered Oct 08 '14 at 11:30

Toro Boro

377
5
15

score 0 · Answer 7 · answered Oct 08 '14 at 11:31

0

No, a dot is not allowed in an identifier name. Only special characters you can use is a $ and _

Checkout the naming rules for identifiers here

answered Oct 08 '14 at 11:31

Aman Gautam

3,499
2
20
25

score 0 · Answer 8 · answered Oct 08 '14 at 11:32

0

You cannot use .(dot) in a variable name. Only alphanumeric characters and _ (underscore) are allowed in the variable name.

answered Oct 08 '14 at 11:32

Amal

278
1
11

score 0 · Answer 9 · answered Oct 08 '14 at 11:36

0

[http://docs.oracle.com/javase/tutorial/java/nutsandbolts/variables.html][1]

http://www.c4learn.com/java/java-variable-naming-rules/

Have a look at these links...

answered Oct 08 '14 at 11:36

kiturk3

538
9
30

score 0 · Answer 10 · answered Oct 08 '14 at 11:37

0

A small note, creating a new String object is worse in perfomance as opposed to just directly giving in the string.

answered Oct 08 '14 at 11:37

engineercoding

832
6
14

Using a dot in a string name

10 Answers10