Using hashsets with Java

1

So I’m experimenting with this code

Using the compiler on

I’m just trying to add these strings to a set then print them however I get this error

/MyClass.java:4: error: cannot find symbol
	Set< String > set = new HashSet<>();
	^
  symbol:   class Set
  location: class MyClass
/MyClass.java:4: error: cannot find symbol
	Set< String > set = new HashSet<>();
	                        ^
  symbol:   class HashSet
  location: class MyClass
2 errors

What’s going on? How do I fix this?

2

is this all your code?
it may be better to link to a public space where we can see your full code.
(do you think you might be missing an import statement?)

3

Yeah that’s it. This is the exact code I have on the JDoodle editor.

4

import java.util.*;

add that to the top

1 Like
5

It worked! Thanks a ton. I’m new to Java, what does this line do exactly? What is it importing?

6

ah! Well, if you are new to java, you may want to learn some fundamentals about java libraries and how to import them.

here’s some resources you can look into

7

Also, the code returns

a
x
z

I understand hash sets (or just sets?) cannot contain duplicates. Although, why in this order? Should it not be Apple, banana, cherry? Why is banana first?

8

this would be because java Hashsets do not guarantee the order of the data.

1 Like
9

So would it be accurate to say that hash set order is randomized?

10

not random. Just no promise that the order is maintained.

11

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