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How can I call methods from a different java project?

It's as the title says. I'm trying to call methods defined in another Java project. Is there a way I can do that? I tried import statements but that didn't work.
EDIT:
So here is what is sitting in the code now in terms of imports:
enter image description here
and here are some of the functions I want to call that are in the other project:
enter image description here
What I've tried is:
import com.example.cs320EthicsPlayer.api.*
but that doesn't work it just says import can't be resolved.
Where the 2 projects are located:
enter image description here
I'm not too familiar with mvn directories but we are using maven. The methods I want to call are from the cs320EthicsPlayer folder (project) and the file I'm calling it from is from partyinthebackend (another project). I haven't called on the other project at all, and that's what I'm trying to figure out.
Class Path for the file I'm trying to call the functions from:
enter image description here

Let's say we have a class Test inside a package com.example :
package com.example;
public class Test {
public static String getHalloWorld (){
return "Hello world";
}
}
All we need if we want to use our class Test in another package is to use import like that
import com.example.Test;
class OtherPackage {
public static void main(String[] args) {
String geeting = Test.getHalloWorld();
System.out.println(geeting);
}
}
You should remember anything you want to use in another package it should be public.
So just check where is the method, which package and class include the method you are trying to import.
Let's fix your problem now:
try
import com.example*
Now you import the whole package, but you should remember you can import and use just the public method from the package example.
Update:
I see you have updated your question again, and you want to use maven, I think that will answer your question :
Java project dependency on another project
I hope that answers your question.

If it is in the same project but different package you can just doing
import package name...
If it is a complete different project you can't import them. You need to re-insert the methods.

How to access the source code for an imported class in Java?

In some code I'm looking at, there was this import statement.
import husaynhakeem.io.facedetector.models.FaceBounds
How do I find the code in this FaceBounds class? I have tried looking on the user's github but I have not been able to find the actual class. The only classes I find are Facing.kt, Orientation.kt and models.kt but not the Facebounds class. https://github.com/husaynhakeem/android-face-detector/tree/master/facedetector/src/main/java/husaynhakeem/io/facedetector/models

data class FaceBounds(val id: Int, val box: Rect)
It's in models.kt

Using classes in my project that originate in a jar file

I'm using Eclipse on a Windows 7 64x machine. I've researched this problem and found many have had a similar one, but no solution I came across quite worked for me.
I'm working on a Project named Assignment_1, on a class named Percolation. I'd like to use the object WeightedQuickUnionUF which is inside a package contained within a jar file, named algs4.jar.
I seem to have added the Jar file I'm interested in to the build-path (it now appears under "Referenced Libraries"). The jar file algs4.jar resides in a folder named lib inside my project's folder.
However, when I try to declare an object of type WeightedQuickUnionUF inside my class, I get an error "WeightedQuickUnionUF cannot be resolved to a type".
I tried various import commands (including just import WeightedQuickUnionUF )before the class declaration and all of them yield the error "The import so and so cannot be resolved".
For example, this piece of code yields both of these errors. One at the import line, and another at the declaration of the WeightedQuickUnionUF object:
package assignment_1_package;
import algs4.WeightedQuickUnionUF;
public class Percolation {
private int[][] grid;
public int gridDimension;
private int opensGrid[][];
private WeightedQuickUnionUF model;
... //rest of class body here
This has baffled me for an entire day and I can't seem to figure this out. Thanks for your efforts.
Edit: here is a link to the class I wish to import: http://algs4.cs.princeton.edu/15uf/WeightedQuickUnionUF.java.html

Assuming you are talking about the algs4.jar of the class http://algs4.cs.princeton.edu/code/ , your import is incorrect you should do :
import WeightedQuickUnionUF;
BUT it's never a good idea to have class in the default package and it's actually not allowed to import a type from the unnamed package: this gives a compilation error.
http://docs.oracle.com/javase/specs/jls/se5.0/html/packages.html#7.4.2:
A type-import-on-demand declaration (§7.5.2) imports all the
accessible (§6.6) types of a named type or package as needed. It is a
compile time error to import a type from the unnamed package.
So in your case to solve your issue just create your classes in the default package so you don't have to do the import at all.

I'm in the same class, had the same problem. Removing my equivalent to these two statements
package assignment_1_package;
import algs4.WeightedQuickUnionUF;
resolved the problem. That's to say the following now resolves correcly
private WeightedQuickUnionUF model;

In my case, it helped adding
import edu.princeton.cs.algs4.StdRandom;
import edu.princeton.cs.algs4.StdStats;
import edu.princeton.cs.algs4.WeightedQuickUnionUF;

java import user defined package - error: cannot find symbol

My directory structure is as follows:
/WorkingDirectory
MyCollection.java
/au/edu/au
/UserInterface
UserInterface.java
/Collection
Album.java
CDAlbum.java
DVDAlbum.java
CollectionFactory.java
Where Album.java is an interface implemented by CDAlbum.java and DVDAlbum.java. Each .java file has the appropriate
package au.edu.uow.UserInterface;
or
package au.edu.uow.Collection;
line.
In UserInterface.java I declare an ArrayList of type Album, which gives me compile errors of
.\au\edu\uow\UserInterface\UserInterface.java:9: error: cannot find symbol
private ArrayList<Album> myCollection;
^
symbol: class Album
location: class UserInterface
I am compiling from MyCollection.java, which has import statements for both packages.
what is causing this error? I tried adding
import au.edu.uow.Collection
to UserInterface.java, but to no avail.

You need either:
import au.edu.uow.Collection.*;
or:
import au.edu.uow.Collection.Album;
Using wildcard imports is more convenient but some consider this a bad practice. This is a matter of style; decide for yourself.
It is also considered good style for package names to be in all-lower-case, although this is not enforced by the compiler.

So, you folder structure looks like /au/edu/au & your trying to import from au.edu.uow
Apart from what JimN has suggested, I think you'll find that Java will complain that te package doesn't exist or the files in /au/edu/au are in the wrong package
Either change the directory structure or package structure to match each other

Java type cannot be resolved MIME type class

I know this is a common question asked but I've been searching and I've included the class into eclipse through the buildpath. I start to write the import statement and it autocompletes options for me so I know it's finding the class.
My problem is how come it's giving this error when I'm reading the docs and it says the constructor method is MimeUtil2() ?
http://www.jarvana.com/jarvana/view/eu/medsea/mimeutil/mime-util/2.1/mime-util-2.1-javadoc.jar!/eu/medsea/mimeutil/MimeUtil2.html#MimeUtil2()
package com.jab.app;
import java.io.File;
import eu.medsea.mimeutil.*;
public class CheckFileType {
private void GetMimeType(File filename){
MimeUtil2 test = new MimeUtil2(); //Produces the error saying java type cannot be resolved
}

I think you need to import
import eu.medsea.mimeutil.*;
According to the documentation, the type is eu.medsea.mimeutil.MimeUtil2

I ended up finding out that I was using the test-source.jar not the main jar file itself. The sourceforge page made the default as the source file instead of the main jar file.
It was buried inside of the files page.