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| One solution is to use Java [[:wikipedia:reflection|reflection]] to reflectively access these fields and methods during runtime, but they suffer from some problems: | | One solution is to use Java [[:wikipedia:reflection|reflection]] to reflectively access these fields and methods during runtime, but they suffer from some problems: |
| * Reflection is slower than regular method calls or field accesses, as certain optimizations done by the JVM cannot be applied.<ref>[https://docs.oracle.com/javase/tutorial/reflect/index.html The Java™ Tutorials: The Reflection API]: ''"Consequently, reflective operations have slower performance than their non-reflective counterparts, and should be avoided in sections of code which are called frequently in performance-sensitive applications."''</ref> This makes reflection unsuitable for performance-critical code, such as during rendering. | | * Reflection is slower than regular method calls or field accesses, as certain optimizations done by the JVM cannot be applied.<ref>[https://docs.oracle.com/javase/tutorial/reflect/index.html The Java™ Tutorials: The Reflection API]: ''"Consequently, reflective operations have slower performance than their non-reflective counterparts, and should be avoided in sections of code which are called frequently in performance-sensitive applications."''</ref> This makes reflection unsuitable for performance-critical code, such as during rendering. |
− | * Reflection cannot allow the modification of <code>final</code> fields which are either marked <code>static</code> or belong to a record class.<ref>[https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/reflect/AccessibleObject.html#setAccessible(boolean) Java 16 javadocs] for <code>java.lang.reflect.AccessibleObject.setAccessible(boolean)</code></ref> | + | * Reflection cannot allow the modification of <code>final</code> fields which are either marked <code>static</code> or belong to a record class.<ref>[https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/reflect/AccessibleObject.html#setAccessible(boolean) Java 17 javadocs] for <code>java.lang.reflect.AccessibleObject.setAccessible(boolean)</code></ref> |
| * Runtime reflection loses the benefit of compile-time type checks, which allows dangerous operations such as trying to set a field's value to an incompatible type. | | * Runtime reflection loses the benefit of compile-time type checks, which allows dangerous operations such as trying to set a field's value to an incompatible type. |
| * The use of reflection does not allow a class to extend a non-visible class. | | * The use of reflection does not allow a class to extend a non-visible class. |
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| The class name is the fully qualified name of the class, using <code>.</code> (dots) to separate between (sub)packages and classes (for example, <code>java.lang.Object</code>). | | The class name is the fully qualified name of the class, using <code>.</code> (dots) to separate between (sub)packages and classes (for example, <code>java.lang.Object</code>). |
| | | |
− | For methods, the method descriptor<ref>''[https://docs.oracle.com/javase/specs/jvms/se16/html/jvms-4.html#jvms-4.3.3 Java Virtual Machine Specification, Java SE 16 Edition]'', 4.3.3. Method Descriptors </ref> of the method is included, which consists of the descriptors for each of the method's parameters and the method's return type. The method parameters descriptors can be absent if there are no parameters in the method, but the return type descriptor must be present. | + | For methods, the method descriptor<ref>''[https://docs.oracle.com/javase/specs/jvms/se17/html/jvms-4.html#jvms-4.3.3 Java Virtual Machine Specification, Java SE 17 Edition]'', 4.3.3. Method Descriptors </ref> of the method is included, which consists of the descriptors for each of the method's parameters and the method's return type. The method parameters descriptors can be absent if there are no parameters in the method, but the return type descriptor must be present. |
| | | |
| The following are the matching descriptors for each type as seen in the method declaration: | | The following are the matching descriptors for each type as seen in the method declaration: |
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| public net.minecraft.Util m_137477_(Ljava/lang/String;)Ljava/util/concurrent/ExecutorService; # makeExecutor | | public net.minecraft.Util m_137477_(Ljava/lang/String;)Ljava/util/concurrent/ExecutorService; # makeExecutor |
| | | |
− | # Makes public the 'leastMostToIntArray' method in SerializableUUID, | + | # Makes public the 'leastMostToIntArray' method in UUIDUtil, |
| # which accepts two longs and returns an int[] | | # which accepts two longs and returns an int[] |
− | public net.minecraft.core.SerializableUUID m_123274_(JJ)[I # leastMostToIntArray | + | public net.minecraft.core.UUIDUtil m_235872_(JJ)[I # leastMostToIntArray |
| </syntaxhighlight> | | </syntaxhighlight> |