Hashmap 没有替换正确的项目

Question

在 main 中运行方法时，我试图用新值替换 Hotel_A。但是为键插入了错误的值。

例如，当您将 Hotel_A 更改为采用 test1 时，Hotel_B 将采用该值。我已经调试过了，if语句的逻辑是正确的。我认为 fetchImage 方法不正确，正在寻找错误的酒店。

预期输出：

尺寸：2

Hotel_A：[B@3dfeca64

酒店_B：[B@1aa8c488

收到的输出：

尺寸：2

Hotel_A：[B@1aa8c488

Hotel_B：[B@3dfeca64

public class Main{

    public static void main(String[] args){
        ImageStore i = new ImageStore();
        byte[] test1 = { (byte) 0x0b, (byte) 0x1f };
        byte[] test2 = { (byte) 0x0a, (byte) 0x1d };

        //Functionality test part 1
        System.out.println("Functionality test part 1");
        i.storeImage("Hotel_A",test2);
        i.storeImage("Hotel a",test2);
        i.storeImage("Hotel B",test1);

        //"The store should have size 2"
        System.out.println("Size: " + i.size());

        //"And contain imageA (test1) and imageB (test2)"
        System.out.println("Hotel_A: " + i.fetchImage("Hotel_A"));
        System.out.println("Hotel_B: " + i.fetchImage("Hotel_B"));

        i.imageObj.clear();


        //Functionality test part 2
        System.out.println("\nFunctionality test part 2");
        i.storeImage("Hotel_A", test1);
        i.storeImage("Hotel a", test1);
        i.storeImage("Hotel_A", test2); //Example included syntax error, important?
        i.storeImage("Hotel a",test2);

        //"The store should have size 1"
        System.out.println("Size:" + i.size());

        //"and only contain imageB"
        System.out.println("Hotel_A: " + i.fetchImage("Hotel_A"));

    }
}



import java.util.Map;
import java.util.HashMap;

public class ImageStore {

    //Declaration of HasMap for id/ byte array storage
    Map<String, byte[]> imageObj = new HashMap<String, byte[]>();

  /**
   * Inserts an image in the store
   *
   * @param id -- The identifier of the image
   * @param content -- The content of the image
   */
  public void storeImage (String id, byte[] image) {
      //Check's input 
      //If Equal to 'Hotel_A' or similar, saves to 'Hotel_A' index
      if (id.equals("Hotel_A") || id.equals("Hotel_a") || 
              id.equals("Hotel A") || id.equals("Hotel a"))
      {
          imageObj.put("Hotel_A",image);
      }

      //Else if equal to 'Hotel_B' or similar, saves to 'Hotel_B' index
      else if (id.equals("Hotel_B") || id.equals("Hotel_b")
              || id.equals("Hotel B") || id.equals("Hotel b"))
      {
          imageObj.put("Hotel_B",image);
      }
  }


  /**
   * Retrieves an image from the store
   *
   * @param id -- The identifier of the image to be retrieved
   * @return the image content
   */   
  public byte[] fetchImage(String id) {
      return imageObj.get(id);
  }

  /**
   * The size of the store
   *
   * @return the actual store size
   */
  public int size() {
    return imageObj.size();
  }
}

Answer 1

将 toString() 添加到 fetchImage 表明我拥有正确的值。我的错。谢谢Particia Shanahan