java - 在 HashMap 中使用整数

Question

所以我尝试通过指定来使用 HashMap:

HashMap totalAtt = new HashMap<String, Integer>();

但是当我尝试将两个整数相加时，它给我一个错误，指出操作数错误。如何添加从此 HashMap 检索的整数而不出现编译器错误或警告？

编辑:替换了一些代码，不再出现编译器错误，而是警告未经检查或不安全的操作

public HashMap<String, Integer> getAttrib()
{
    HashMap<String, Integer> totalAtt = new HashMap();

    //Creates key values and initializes them to 0
    totalAtt.put("strength", 0);
    totalAtt.put("dexterity", 0);
    totalAtt.put("constitution", 0);
    totalAtt.put("intelligence", 0);
    totalAtt.put("wisdom", 0);
    totalAtt.put("charisma", 0);

    HashMap<String, Integer> sAtt;

    for(Sprite s: itemList)
    {
        //iterates through items and counts their attributes
        sAtt = s.getAttrib();

        totalAtt.put("strength", totalAtt.get("strength") + sAtt.get("strength"));
        totalAtt.put("dexterity", totalAtt.get("dexterity") + sAtt.get("dexterity"));
        totalAtt.put("constitution", totalAtt.get("constitution") + sAtt.get("constitution"));
        totalAtt.put("intelligence", totalAtt.get("intelligence") + sAtt.get("intelligence"));
        totalAtt.put("wisdom", totalAtt.get("wisdom") + sAtt.get("wisdom"));
        totalAtt.put("charisma", totalAtt.get("charisma") + sAtt.get("charisma"));
    }

    return totalAtt;
}

来自 Sprite 类:

public HashMap<String, Integer> getAttrib()
{
    return attrib;
}

Answer 1

改变

HashMap totalAtt = new HashMap<String, Integer>();

至

HashMap<String, Integer> totalAtt = new HashMap<>();

和

HashMap sAtt

至

HashMap<String, Integer> sAtt