Question

我有疑问，我想开发一个关于扩展hashmap的程序来添加putchildren方法.. 我写了主类，但现在我想写putChildrenValue方法.. 我的问题是：我需要实现一个带有3个参数的putChildrenValue方法，String key，String key，ObjectValue。它将相应地存储系统。

当我完成此方法时完成方法数据

Key1 = "RUBY" value=HashMap which has -> "key2" = 5248 && "VALUE" = German
Key1 = "PYTHON" value=HashMap which has -> "key2" = 1234 && -> "VALUE" = German

我的主要课程是：

public static void main(String [] args)
{
    ExtendedHashMap extendedMap = new ExtendedHashMap();
    extendedMap.put (“Row1”, “Column1”, “German”);
    extendedMap.put (“Row1”, “Column2”, “English”);
    extendedMap.put (“Row1”, “Column3”, “Spanish”);
    extendedMap.put (“Row2”, “Column1”, “Ruby”);
    extendedMap.put (“Row2”, “Column2”, “Python”);
    extendedMap.put (“Row3”, “Column3”, “Java”);
}

任何人都可以帮助我吗？

Answer 1

可能会这样：

import java.util.HashMap;

public class ExtHashMap<K1, K2, V> extends HashMap<K1, HashMap<K2, V>> {

  public ExtHashMap() {
    super();
  }

  public void putChildrenValue(K1 key1, K2 key2, V value) {

    HashMap<K2, V> childMap = get(key2);
      if (childMap == null) { 
        childMap = new HashMap<K2, V>();
        put(key1, childMap);
      }
      childMap.put(key2, value);
    }
  }
}

以下代码段提供了有关如何创建和使用它的示例：

ExtHashMap<String, int, String> map = new ExtHashMap<String, int, String>();
map.putChildValue("RUBY", 1234, "VALUE1");
map.putChildValue("PYTHON", 4321, "VALUE2");

子图按需自动处理。

扩展HashMap以添加putChildren方法

1 个答案: