java - 是什么导致了我的 NullPointerException？

Question

我的程序编译完美，但每当我尝试运行时，它都会抛出 NullPointerException。我尝试对此进行搜索，发现该错误与程序尝试使用某些值为空的值有关，但我重新检查了所有内容，结果却是空白。

错误如下:

java.lang.NullPointerException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
at java.lang.reflect.Method.invoke(Unknown Source) 
at edu.rice.cs.drjava.model.compiler.JavacCompiler.runCommand(JavacCompiler.java:27‌​2)

代码:

import javax.swing.*;
import java.util.Scanner;

public class WorldsMostBoringGame
{ 
  public void main (String [] args)
  {    
    System.out.println("You are in a room with a locked door and a key.");

     Scanner keyboard = new Scanner(System.in);
     boolean hasKey = false, doorOpen = false, amIDoneYet = false, monsterAlive = true;

    while (!amIDoneYet)
    {
      String userInput = keyboard.nextLine();

      if (userInput == "look around")
        LookAround(hasKey);
      else if (userInput == "get key")
        GetKey(hasKey, monsterAlive);
      else if (userInput == "open door")
        OpenDoor(doorOpen, hasKey, amIDoneYet);
      else if (userInput == "kill monster")
        KillMonster(monsterAlive);
      else
        System.out.println(userInput+ " is not a recognized command.");
    }
  }

  public boolean GetKey(boolean hasKey, boolean monsterAlive)
  {
    if (hasKey == false && monsterAlive == false)
      System.out.println("You pick up the key.");
    else if (hasKey == true && monsterAlive == false)
      System.out.println("You already picked up the key.");
    else if (monsterAlive == true)
    {
      System.out.println("You must kill the monster first.");
      return hasKey = false;
    }

    return hasKey = true;
  }

  public void LookAround(boolean hasKey)
  {
    if (!hasKey)
      System.out.println("You are in a room with a locked door and a key.");
    else
      System.out.println("You are in a room with a locked door. You have a key.");
  }

  public boolean OpenDoor(boolean doorOpen, boolean hasKey, boolean amIDoneYet)
  {
    if (hasKey)
    {
      System.out.println("You unlock the door. Game over. You win.");
      amIDoneYet = true;
      return doorOpen;
    }
    else
    {
      System.out.println("The door is locked. Find a key.");
      return doorOpen = false;
    }
  }

  public boolean KillMonster(boolean monsterAlive)
  {
    System.out.println("You kill the monster.");
    return monsterAlive = false;
  }
}

Answer 1

向 main 方法添加 static 关键字，以便应用程序具有有效的入口点

public static void main (String [] args) {

编辑:

完成此更改后，创建 WorldsMostBoringGame 的实例，以便可以调用实例方法:

WorldsMostBoringGame game = new WorldsMostBoringGame(); // create this instance
while (!amIDoneYet) {
   String userInput = keyboard.nextLine();
    if ("look around".equals(userInput)) { // use String.equals
       game.lookAround(hasKey);
    } ...