程序在nextLine()上停顿[不是因为缺少用户输入]

Question

要非常明确的是，我的程序不是简单的等待用户输入。当行

choice = in.nextInt();

我的菜单甚至不会出现，如果我输入任何类型的输入，程序就会被打断。如果没有next.Int()行，这个方法看起来工作得很好，菜单会显示出来，如果我事先手动设置我的选择，我会穿越开关。我甚至尝试在这行前后使用in.nextline(目前已被注释掉)来清除挂起的回车，但这似乎也没有帮助。

我不知道为什么这一行似乎会在我的代码中造成问题。

为了了解更多的背景，这里是 nextInt()给我带来问题的方法。

public void Manage() throws ListException {
    Scanner in = new Scanner(System.in);
    System.out.println("1. Display items");
    System.out.println("2. Add item");
    System.out.println("3. Insert item");
    System.out.println("4. Delete item");
    System.out.println("5. Exit");

    System.out.println("Enter option:");
    //int choice = in.nextInt();
    choice = in.nextInt();
    //in.nextLine();

    switch (choice) {
        //display
        case 1:
            System.out.println(dList);
            break;
        //add
        case 2:
            System.out.println("Please enter the address:");
            String a = in.nextLine();
            System.out.println("Please enter the square footage:");
            double f = in.nextDouble();
            System.out.println("Please enter the value:");
            double v = in.nextDouble();
            try {
                Dwelling x = new Dwelling(a,f,v);
                dList.add(x);
            }
            catch (ListException e) {
                throw new ListException("add");
            }
            break;
        //insert
        case 3:
            System.out.println("Please enter the address:");
            String ad = in.nextLine();
            System.out.println("Please enter the square footage:");
            double fo = in.nextDouble();
            System.out.println("Please enter the value:");
            double va = in.nextDouble();
            int p = in.nextInt();
            try {
                Dwelling y = new Dwelling(ad,fo,va);
                dList.insert(y,p);
            }
            catch (ListException e) {
                throw new ListException("insert");
            }
            System.out.println("Please enter the position to insert:");
            break;
        //delete
        case 4:
            System.out.println("Please enter the position to delete:");
            int d = in.nextInt();
            try {
                dList.delete(d);
            }
            catch (ListException e) {
                throw new ListException("delete");
            }
            break;
        //exit
        case 5:
            break;
    }
 //use update method to update data file

}//end of manage method