如何访问在另一个方法中创建的对象

Question

我正在尝试创建一种可以查看对象的方法。如何通过bag1方法访问view()对象？

public class ArrayBagUtilities {
    public void Create() {
        Scanner keyboard = new Scanner(System.in);
        System.out.print("Size of bag 1: ");
        int size = keyboard.nextInt();
        Bag bag1 = new ArrayBag(size);
        keyboard.nextLine();
        String itemStr;

        for (int i = 0; i < size; i++) {
            int n = i+1;
            System.out.print("Item " + n + ": ");
            itemStr = keyboard.nextLine();
            bag1.add(itemStr);
        }
    }

    public void view() {
        System.out.print(bag1);
    }
}

Answer 1

您可以将bag1声明为类的属性。

public class ArrayBagUtilities {
    private Bag bag1;
    ....
    public void Create() {
    ....
        bag1 = new ArrayBag(size);
    ....
    }

    public void view() {
        System.out.print(bag1);
    }
}