Question

我正在向数组中添加对象。我可以成功添加第一个对象，并循环到第二个对象。在我添加第二个对象后，当方法结束时，数组会删除第二个对象。

这是一堂课，所以我们只限于学到的基本知识。我错过了什么？

public class Assignment02Driver {

Scanner input = new Scanner(System.in);
Item yourItem = new Item();
Item[] cargohold = new Item[1];
Item[] holdThis = new Item[1];
int numberOItems = 0;
int index = 0;

public static void main(String[] args) {
    new Assignment02Driver();
}

public Assignment02Driver() {

System.out.println("Welcome to the BlackStar Cargo Hold interface.");
System.out.println("Please select a number from the options below");
System.out.println("");

while (true) {
    // Give the user a list of their options
        System.out.println("1: Add an item to the cargo hold.");

        // Get the user input
        int userChoice = input.nextInt();
        input.nextLine();

        switch (userChoice) {
    case 1:
                addItem(cargohold);
                break;
 // Other Stuff


 // Add Item Method
private void addItem(Item cargohold[]) {
    Item cargo = new Item();
    while (numberOItems > 10) {
        System.out.println("We're too good at pirating. Go remove some loot.");
    }

    // Name item
    System.out.println("What item did you loot?"); // Hey you!
    String item = input.nextLine(); // What item was gained
    cargo.setName(item); // Save in position 1 of array        

    // Item weight
    System.out.println("What is its weight in kilograms?");
    double mass = input.nextDouble();
    cargo.setWeight(mass);

    // Item value

    // Item durability

    // Item ID

我认为问题出现在这里，但我不知道如何解决它：

    // Resize the array and add the item to it
    if (numberOItems == cargohold.length) {
        Item[] holdThis = new Item[cargohold.length + 1];
    for (int i = 0; i < numberOItems; i++) {
                holdThis[i] = cargohold[i];
    }
            cargohold = holdThis;

    }
    cargohold[numberOItems] = cargo;

    // Add item to count
    numberOItems++;
}

在它存在此方法之后，第二个项目将从数组中删除/丢失。如果我尝试添加另一个项目，我会收到一个越界错误。

迭代后数组丢弃对象

0 个答案: