java - 如何将 newItem 设置为 JOptionPane？

Question

public static InventoryItem addNewItem(){

    InventoryItem newItem;
    JOptionPane.showInputDialog(null," Enter new product name.",
                    " by Marquis Watkins", JOptionPane.QUESTION_MESSAGE) 
    JOptionPane.showInputDialog(null," Enter product price." ,
                    " by Marquis Watkins", JOptionPane.QUESTION_MESSAGE);
    JOptionPane.showInputDialog(null,"Enter quantity of product.",
                    " by Marquis Watkins", JOptionPane.QUESTION_MESSAGE);

    return newItem;
}

此方法使用 JOptionPane.showInputDialog() 从用户获取三个输入

然后使用输入的值构造一个新的 InventoryItem 对象并返回给调用者和对该新 InventoryItem 的对象引用。

大约 10-12 行。如何设置 newItem 以返回我的 JOptionPane 输入屏幕？

Answer 1

如果没有 InventoryItem 的代码，我们无法知道，但像这样的事情应该会让您走上正轨。正如@Cinnam 的评论中提到的，您需要存储返回值:

public static InventoryItem addNewItem() {

    String name = JOptionPane.showInputDialog(null," Enter new product name."," by Marquis Watkins", JOptionPane.QUESTION_MESSAGE);
    String price = JOptionPane.showInputDialog(null," Enter product price." ," by Marquis  Watkins", JOptionPane.QUESTION_MESSAGE);
    String quantity = JOptionPane.showInputDialog(null,"Enter quantity of product."," by Marquis Watkins", JOptionPane.QUESTION_MESSAGE);

    return new InventoryItem(name, price, quantity);
}

这里我假设您可以从 3 个字符串构造一个 InventoryItem。