String str = obj.toString(); Object obj = "オブジェクト"; String str = (String)obj; のようにキャストすることも可能だが、キャストは型の互換性が確認されていないと実行時に ClassCastException を引き起こす可能性がある。

Javaではオブジェクト固有の情報を文字列化するために Object#toString メソッドが規定されています。 そのため Object#toString メソッドを実装すれば冒頭のような問題は解消します。

Even beginning Java developers are aware of the utility of the Object.toString() method that is available to all instances of Java classes and can be overridden to provide useful details regarding ...

If you want to add new class type to list in this document, please create Issue or Pull request. java.util.Date: Thu Nov 18 05:59:33 UTC 2021 java.util.GregorianCalendar: ...

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Object.toString () Groovy inherits positive Java features including the ability for object’s to easily provide their state via a standard approach by explicitly overriding Object.toString ().

IntListVer2 Added default add method, equals method, and toString methods. Includes versions of toString using String concatenation and StringBuffer to illustarte performance differences.