Java中的"int不能被解除引用"

BBl*_*m83 23 java int bluej

我是Java的新手,我正在使用BlueJ.我在尝试编译时不断得到"Int not be dereferenced"错误,我不确定问题是什么.错误特别发生在我底部的if语句中,其中"equals"是一个错误,"int不能被解除引用".希望得到一些帮助,因为我不知道该怎么做.先感谢您!

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();
            }
        }
    }
}
Run Code Online (Sandbox Code Playgroud)

Jun*_*san 18

id是原始类型int而不是Object.您不能像在这里那样调用基元上的方法:

id.equals
Run Code Online (Sandbox Code Playgroud)

尝试替换这个:

        if (id.equals(list[pos].getItemNumber())){ //Getting error on "equals"
Run Code Online (Sandbox Code Playgroud)

        if (id == list[pos].getItemNumber()){ //Getting error on "equals"
Run Code Online (Sandbox Code Playgroud)


Mad*_*mer 6

基本上,您尝试使用的int好像是Object,而不是(嗯...很复杂)

id.equals(list[pos].getItemNumber())
Run Code Online (Sandbox Code Playgroud)

应该...

id == list[pos].getItemNumber()
Run Code Online (Sandbox Code Playgroud)