asmhatreandClaude Sonnet 5.5
f6237d4117
Co-Authored-By: Claude Sonnet 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_017ic4b6NtPJHrkan4BXhCAM
48 lines
2.2 KiB
Plaintext
48 lines
2.2 KiB
Plaintext
$ java -cp target/classes com.ankurm.reflection.FinalFieldDemo # JDK 25
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java.version = 25.0.5
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== 1. final instance field ==
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owner() now: mallory
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== 2. static final field ==
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IllegalAccessException: Can not set static final int field com.ankurm.reflection.Account.MAX_DEPOSIT to java.lang.Integer
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== 3. record component ==
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IllegalAccessException: Can not set final int field com.ankurm.reflection.FinalFieldDemo$Point.x to java.lang.Integer
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== 4. constant inlining: the write 'works' but the getter never notices ==
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Field.get -> 99
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max() -> 5
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$ java -cp target/classes com.ankurm.reflection.FinalFieldDemo # JDK 26
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java.version = 26.0.2.1
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== 1. final instance field ==
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WARNING: Final field owner in class com.ankurm.reflection.Account has been mutated reflectively by class com.ankurm.reflection.FinalFieldDemo in unnamed module @18b4aac2 (file:/tmp/work/java-core-examples/reflection/target/classes/)
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WARNING: Use --enable-final-field-mutation=ALL-UNNAMED to avoid a warning
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WARNING: Mutating final fields will be blocked in a future release unless final field mutation is enabled
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owner() now: mallory
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== 2. static final field ==
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IllegalAccessException: Can not set static final int field com.ankurm.reflection.Account.MAX_DEPOSIT to java.lang.Integer
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== 3. record component ==
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IllegalAccessException: Can not set final int field com.ankurm.reflection.FinalFieldDemo$Point.x to java.lang.Integer
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== 4. constant inlining: the write 'works' but the getter never notices ==
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Field.get -> 99
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max() -> 5
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$ java --illegal-final-field-mutation=deny -cp target/classes com.ankurm.reflection.FinalFieldDemo # JDK 26
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java.version = 26.0.2.1
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== 1. final instance field ==
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Exception in thread "main" java.lang.IllegalAccessException: class com.ankurm.reflection.FinalFieldDemo (in unnamed module @18b4aac2) cannot set final field com.ankurm.reflection.Account.owner (in unnamed module @18b4aac2), unnamed module @18b4aac2 is not allowed to mutate final fields
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at java.base/java.lang.reflect.Field.preSetFinal(Field.java:1504)
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at java.base/java.lang.reflect.Field.setFinal(Field.java:1447)
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at java.base/java.lang.reflect.Field.set(Field.java:909)
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at com.ankurm.reflection.FinalFieldDemo.main(FinalFieldDemo.java:30)
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