java - Java中的"int cannot be dereferenced"

Question

我对 Java 还很陌生，我正在使用 BlueJ。我在尝试编译时不断收到这个“Int cannot be dereferenced”错误，我不确定问题是什么。该错误特别发生在我底部的 if 语句中，它说“等于”是一个错误，“int 不能被取消引用”。希望得到一些帮助，因为我不知道该怎么做。提前谢谢!

public class Catalog {
    private Item[] list;
    private int size;

    // Construct an empty catalog with the specified capacity.
    public Catalog(int max) {
        list = new Item[max];
        size = 0;
    }

    // Insert a new item into the catalog.
    // Throw a CatalogFull exception if the catalog is full.
    public void insert(Item obj) throws CatalogFull {
        if (list.length == size) {
            throw new CatalogFull();
        }
        list[size] = obj;
        ++size;
    }

    // Search the catalog for the item whose item number
    // is the parameter id.  Return the matching object 
    // if the search succeeds.  Throw an ItemNotFound
    // exception if the search fails.
    public Item find(int id) throws ItemNotFound {
        for (int pos = 0; pos < size; ++pos){
            if (id.equals(list[pos].getItemNumber())){ //Getting error on "equals"
                return list[pos];
            }
            else {
                throw new ItemNotFound();
            }
        }
    }
}

Answer 1

id 是原始类型 int 而不是 Object。您不能像在此处那样调用原语上的方法:

id.equals

尝试替换这个:

        if (id.equals(list[pos].getItemNumber())){ //Getting error on "equals"

与

        if (id == list[pos].getItemNumber()){ //Getting error on "equals"