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

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

Summary

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.

Properties

Class Name	Inefficient Box-Unbox (Java)
Significance	reliability
Mnemonic	JAVA.CLASS.BUB
Categories	None
Availability	Available for Java and Kotlin.
Enabling	Checks for this warning class are enabled by default. To disable them, add the following WARNING_FILTER rule to the project configuration file. WARNING_FILTER += discard class="Inefficient Box-Unbox (Java)"

Example

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.

public class Converter {

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

Resolution

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.

Relevant Configuration File Parameters

The following configuration file parameters affect checks for this warning class.