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  1. JDK
  2. JDK-8284939

Add the method `Class::isSublassOf(Class<?>)` to `java.lang.Class` that does the inverse of `Class::isAssignableFrom`

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    • generic
    • generic

    Description

      A DESCRIPTION OF THE PROBLEM :
      As explained in [https://github.com/openjdk/jdk/pull/7061#issuecomment-1046816442], `Class::isAssignableFrom` tends to be used incorrectly (see: JDK-8034820, JDK-8254717, and JDK-8279800).

      I propose to add the following method to `java.lang.Class`, which should hopefully be clearer about the order of arguments:
      ```java
      public boolean isSublassOf(final Class<?> cls) {
      return cls.isAssignableFrom(this);
      }
      ```

      this method also complements the `Class::asSubclassOf` method.


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          relates to

          Bug - A problem which impairs or prevents the functions of the product. JDK-8279800 isAssignableFrom checks in AlgorithmParametersSpi.engineGetParameterSpec appear to be backwards

          • P3 - Major loss of function.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. JDK-8254717 isAssignableFrom checks in KeyFactorySpi.engineGetKeySpec appear to be backwards

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. JDK-8034820 Wrong isAssignableFrom test when adding Principal to Subject

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Closed

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              smarks Stuart Marks
              webbuggrp Webbug Group
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