public interface Context
@Nullable <V> V put(String key, V value)
V - 上下文数据类型key - 键value - 值@Nullable <V> V get(String key)
V - 值类型key - 键@Nullable <V> V remove(String key)
V - 值类型key - 键default boolean remove(String key, Object value)
key - 键value - 目标值boolean containsKey(String key)
key - 键void clear()
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