Created
September 26, 2017 05:49
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getなのに、なぜエラーメッセージが「set」なのか？
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| package example; | |
| import java.lang.reflect.Field; | |
| public class FieldExample { | |
| public static void main(String[] args) throws Exception { | |
| Field field = Integer.class.getDeclaredField("value"); | |
| field.setAccessible(true); | |
| field.getInt(""); | |
| } | |
| } |
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| Exception in thread "main" java.lang.IllegalArgumentException: Can not set final int field java.lang.Integer.value to java.lang.String | |
| at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:167) | |
| at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:171) | |
| at sun.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:58) | |
| at sun.reflect.UnsafeQualifiedIntegerFieldAccessorImpl.getInt(UnsafeQualifiedIntegerFieldAccessorImpl.java:58) | |
| at java.lang.reflect.Field.getInt(Field.java:574) | |
| at example.FieldExample.main(FieldExample.java:10) |
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