为什么我不能创建Java列表？

Question

I can't make the code below run. The feedback I get is "cannot find symbol" and the place where it occurs is at the letter 'i' on the line "private List products;".

The error message is: [ERROR] \\Users\\Filip\\Dropbox\\EclipseWorkspace\\ProductsCarts\\src\\main\\java\\hello\\Cart.java:[8,14] error: cannot find symbol

I don't know if it matters but I am using the Spring Boot framework and Maven.

What is wrong? (Observe that the class Cart consist of a list of Product. The code for a product is presented below this on)

package main.java.hello;

import java.util.LinkedList;
import java.util.List;

public class Cart {
    private int id;
    private List<Product> products;

    public Cart(int id){
        this.id=id;
        //products=new LinkedList<Product>();

    }
}

The code for Product:

package main.java.hello;

public class Product {
    private int id;
    private String name;
    private double priceIncVat;
    private double vatPercentage;
    private double vatAmount;



    public Product(int id, String name, float priceIncVat, float vatAmount){
        this.id=id;
        this.name=name;
        this.priceIncVat=priceIncVat;
        this.vatPercentage=(vatAmount/priceIncVat);

    }

}

Here is the complete error message:

 [ERROR] \Users\Filip\Dropbox\EclipseWorkspace\ProductsCarts\src\main\java\hello\Cart.java:[8,14] error: cannot find symbol
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project gs-handling-form-submission: Compilation failure
[ERROR] \Users\Filip\Dropbox\EclipseWorkspace\ProductsCarts\src\main\java\hello\Cart.java:[8,14] error: cannot find symbol
[ERROR] -> [Help 1]
 [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
 [ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
C:\Users\Filip\Dropbox\EclipseWorkspace\ProductsCarts>

Answer 1

You're mixing directory layouts. Maven puts source code in src/main/java , not just src . Your package declaration thinks you're just putting the code in src . Remove the extra components, and you may not be using m2eclipse to manage the Eclipse build; install and import your project as a Maven project if not.

Answer 2

Just create the sample java project and install the "m2eclipse" plugin to manage the eclipse build. and then right click on your project go to configure and click on convert to maven option then your project was converted to maven, in you project directory root folder pom.xml file was generated. and check with your package folder like src/main/java and src/test/java etc. then create package in this location src/main/java and create the java file. if u need to add any jar files for your project just update the pom.xml file it contains

<groupId>....</groupid>
<artifactId>...</artifactId>
<version>....</version>`enter code here`