1、 首先，打开Eclipse，创建一个Class文件。 2、 创建HashMap集合时，需指定其泛型类型。 3、 向集合添加元素时，前面为键，后面为其对应的值。 4、 通过HashMap集合对象的keySet()方法获取所有键，并将这些键赋值给Set集合，从而创建Set集合类型。 5、 用增强for循环 ...
While the Hashtable was part of the initial Java release over two decades ago, the HashMap is the correct key-value store to use today. One key HashMap vs. Hashtable difference is the fact that the ...
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