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As a general rule, use the Object.equals() method to check whether two objects are abstractly equal to each other. Programs must reserve use of the equality operators == and != for testing whether two references specifically refer to the same object; this is reference equality. Also see rule MET09-J. Classes that define an equals() method must also define a hashCode() method.
This use of the equality operators also applies to numeric boxed types (for example, Byte, Character, Short, Integer, Long, Float, and Double), although the numeric relational operators (such as <, <=, >, and >=) produce results that match those provided for arguments of the equivalent primitive numeric types. See rule EXP03-J. Do not use the equality operators when comparing values of boxed primitives for more information.
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<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="515e0b9f60ccccf5-8e057a5e-43d9494d-95c4a9a9-bd1fcbe4eeaae181cdd53a3a"><ac:plain-text-body><![CDATA[ | [[JLS 2005 | AA. References#JLS 05]] | [§3.10.5, "String Literals" | http://java.sun.com/docs/books/jls/third_edition/html/lexical.html#3.10.5] | ]]></ac:plain-text-body></ac:structured-macro> |
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