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java - 请问Map map = new HashMap;与Map map = Maps.Hashmap;创建的map对象有什么区别?

天蓬老师天蓬老师2763 days ago791

reply all(2)I'll reply

  • 巴扎黑

    巴扎黑2017-04-18 10:47:14

    Are you talking about com.google.common.collect.Maps.newHashMap()?

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  • 大家讲道理

    大家讲道理2017-04-18 10:47:14

    There is no difference, you will know after looking at the source code:

    /**
       * Creates a <i>mutable</i>, empty {@code HashMap} instance.
       *
       * <p><b>Note:</b> if mutability is not required, use {@link
       * ImmutableMap#of()} instead.
       *
       * <p><b>Note:</b> if {@code K} is an {@code enum} type, use {@link
       * #newEnumMap} instead.
       *
       * @return a new, empty {@code HashMap}
       */
      public static <K, V> HashMap<K, V> newHashMap() {
        return new HashMap<K, V>();
      }

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