java - 类型不匹配 : cannot convert from double[][] to double[]

Question

我对 Java 很陌生，这个问题刚刚出现，我尝试搜索但无法找出为什么会发生这种情况。

public class Cliente{

    private int clientID;
    private String clientName;
    private double clientDebt;
    private double[][] clientHistory;


    public void registerID(int newID) {
        this.clientID = newID;
    }

    // Here is the issue
    public void newInvoice(double[][] invoice) {
        this.clientHistory[this.clientHistory.length] = invoice;
    }

}

Answer 1

您是否想跟踪发票数量不断变化的发票列表？如果是这样，您可能需要使用 ArrayList 。此类允许您添加新发票而不删除旧发票。你的类看起来像这样:

public class Cliente{

    private int clientID;
    private String clientName;
    private double clientDebt;
    private ArrayList<double[]> clientHistory = new ArrayList<double[]>();


    public void registerID(int newID) {
        this.clientID = newID;
    }

    // Here is the issue
    public void newInvoice(double[] invoice) {
        clientHistory.add(invoice);
    }

}