Package java.util

Class Collections

extends Object

Contains static methods that operate on or return collections.

The methods throw a NullPointerException if collections or provided objects are null.

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Public Methods

Methods inherited from java.lang.Object

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Public Fields

  • static final List EMPTY_LIST
  • static final Map EMPTY_MAP
  • static final Set EMPTY_SET

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The empty list, map, set. All are immutable.