問題描述

問題解答

你說的是com.google.common.collect.Maps.newHashMap()嗎？

沒什么區(qū)別，你看下源碼就知道了:

/** * 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>(); }