C# "is" operator alternative in Java

Question

in C# when I want to know if an object is an instance of a particular type or not, I can use "is" operator:

String foo = "hi :)"
if (foo is String) ...

how can I do it in java? (I know I can use try statement, any other way?)

score 26 · Accepted Answer · answered Aug 09 '13 at 12:59

26

Java equivalent:

String foo = "hi :)"
if (foo instanceof String)

answered Aug 09 '13 at 12:59

rocketboy

1

`is` in C# can assign the value to a new instance. `instanceof` seems that only checks for type equality. – ageroh May 21 '21 at 08:01

score 12 · Answer 2 · answered Aug 09 '13 at 12:59

You'd use instanceof - that's the equivalent of is in C#. Note that there's no equivalent of as.

See the JLS section 15.20.2 for more details of instanceof, but it's basically the same as is:

// Note: no point in using instanceof if foo is declared to be String!
Object foo = "hello";
if (foo instanceof String)
{
    ...
}

score 6 · Answer 3 · answered Aug 09 '13 at 12:59

6

instanceof is the java equivalent to the C# is operator.

answered Aug 09 '13 at 12:59

William Morrison

score 6 · Answer 4 · answered Aug 09 '13 at 13:00

6

Try something like this:-

String foo = "hi :)"
if (foo instanceof String)
{
 ......
}

answered Aug 09 '13 at 13:00

Rahul Tripathi

score 5 · Answer 5 · answered Aug 09 '13 at 13:00

5

if (foo instanceof String)

I believe is what you're looking for

answered Aug 09 '13 at 13:00

jongusmoe

score 4 · Answer 6 · answered Aug 09 '13 at 13:00

4

In java you can use "instanceof" instead of "is"

String foo = "hi :)"
if (foo instanceof String)

answered Aug 09 '13 at 13:00

Marseld

6 Answers6