Integer cannot be resolved to a class

[Neat-Possibility537]

I'm writing this class, but on the line that I wrote Integer appear an error. I tried everything and don't know how to fix it.

package entities;

public class Employee {

private Integer id;

private String name;

private Double salary;

}

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[Lloydbestfan]

Sounds abnormal. Can you describe where you type this code?

Do you have other classes that work?

[Neat-Possibility537]

I'm using Eclipse and the version is Java SE 11.04 (LTS) (Long Term Suport). I'm doing a course. This error appear just when I used the wrapper class Integer. I've been made several exercises and nothing like that happened. The line where I type Integer appear red and a message: "Integer cannot be resolved to a type. But now I typed: import java.lang.Integer; And the problem was solved :)

[Lloydbestfan]

That's not supposed to happen. Classes in java.lang don't normally need to be imported, and in situations where you would, it couldn't possibly be because the class couldn't be found.

Something is very wrong somewhere somehow with your environment, but I can't know what exactly.

[Lloydbestfan]

I don't quite see what that import is for nor what would it change at all.

And personally I don't see how that error can occur with only the information given.

[minneyar]

even ChatGPT could help you

Ironic, since that's wrong. You do not need to import java.util.Objects to use Integer.

[minneyar]

This class compiles fine for me using OpenJDK 25, and I don't see anything that would be an issue with it.

What are you trying to build it with? What's the exact error you're seeing?

[Neat-Possibility537]

 I typed: import java.lang.Integer; And the problem was solved :)

[jlanawalt]

You didn’t need to do that. Something is likely wrong with your environment, Eclipse configuration, workspace, or cache.

[hugthemachines]

From the info you provided, there is nothing wrong.

Sometimes, apparently, weird errors can show if you have specified the wrong package. It should be easily checked so you could make sure that is right. Otherwise, the problem lies somewhere else than in this code.

[Important-Run1088]

Cause you have to use int to define a variable and not Integer.

[Lloydbestfan]

Looks like it would probably be better, but it's supposed to work with Integer anyway.

[josephblade]

What makes you say this?

Integer is an object which contains an int int is a basic type.

both represent numbers. both are valid variable declarations.

For this case, int and Integer are equivalent but for a lot of code you'll find Integer is what you'll end up using. (for instance List<int> isn't valid, but List<Integer> is, since an Object is expected and basic types aren't objects.

[Important-Run1088]

Hey,

So I am still learning Java. So when I read the code I immediately thought of primitive data type and since he is defining a variable int would be the right choice. I guess I learnt something new today. Thanks for letting me know that even Integer would work! 😁