Question

我在JAVA编写程序，我正在使用HashMap。

$ ~/.local/bin/spyder3
Failed to write user configuration file.
Please submit a bug report.
Traceback (most recent call last):
  File "/home/stelios/.local/lib/python3.6/site-packages/spyder/utils/external/lockfile.py", line 150, in lock
    symlink(str(os.getpid()), self.name)
FileExistsError: [Errno 17] File exists: '9449' -> '/home/stelios/.config/spyder-py3/spyder.lock'

Plane是我创建的一个类：

 private HashMap<Integer,Plane> planes;

然后我尝试打印HashMap的所有组件：

public class Plane {
   private int planeNumber;
   private int departureTime;
   private int arrivalTime;
   private int flightDuration;
   private int aerialDrops;

   //constructors...
}

问题是我想打印描述平面的所有变量的值，而是从mentry.getValue（）获得aircrafts.Plane@15db9742。我该如何解决这个问题？

Answer 1

您需要为 Plane 类覆盖并添加 toString 方法，

gender = input("What is your gender? ")
if 'male' == gender:
    print("You are a boy!")
if 'female' == gender:
    print("You are a girl!")

现在你正在使用Object类parent

的toString方法

Answer 2

根据您的需要，稍作改动可以正常工作：

   public class Plane {
   private int planeNumber;
   private int planeNumber;
   private int arrivalTime;
   private int flightDuration;
   private int aerialDrops;

   public String toString()
{
  return planeNumber +" "+planeNumber+" "+arrivalTime+" "+flightDuration+" "+aerialDrops
}
}

如何使用getValue从HashMap获取更多值

2 个答案: