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CodeSonar® 9.2p0 CONFIDENTIAL CodeSecure Inc
Java

JAVA.CLASS.BUB : Inefficient Box-Unbox (Java)

要旨

A box/unbox sequence can be simplified and made more efficient.

It is often convenient to use a literal or a unique object instead of explicitly constructing new instances, when the same object is used many times, since distinct objects are created at each new statement, which affects the performance of the code. Moreover, objects used instead of literals are often short-lived and consequently must be claimed back from the garbage-collector.

プロパティ

クラス名 Inefficient Box-Unbox (Java)
日本語クラス名 Inefficient Box-Unbox (Java)
クラス分類 信頼性 (reliability)
ニーモニック JAVA.CLASS.BUB
カテゴリー なし
対応言語 Available for Java and Kotlin.
有効/無効設定 このワーニングクラスのチェックはデフォルトで有効になっています。チェックを無効にするにはプロジェクト設定ファイル （configuration file）に以下の WARNING_FILTER ルールを追加してください。 
WARNING_FILTER += discard class="Inefficient Box-Unbox (Java)"

例 

public class Converter {

  public static boolean conversion(String stringToboolean) {
      return Boolean.valueOf(stringToboolean).booleanValue(); // "Inefficient Box-Unbox (Java)" warning issued here
  }
}

The same operation can be performed more efficiently using the method Boolean.parseBoolean, which is used by the implementation of Boolean.valueOf.

The programmer could modify the program to address the problem as follows.

public class Converter {

  public static boolean conversion(String stringToboolean) {
      return Boolean.parseBoolean(stringToboolean);
  }
}

解決法

Use string literals instead of the creation of constant strings. Use factory methods or the automatic boxing mechanism instead of the instantiation of a primitive wrapper class.

関連のある設定ファイルパラメータ

設定ファイルの以下のパラメータがこのワーニングクラスのチェックに影響します。

 

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