回答編集履歴
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finalize
test
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@@ -1 +1,57 @@
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GC(ガベコレ）が発生したときにとじられるやつですね（やってはいけないこと）
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# 追記
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参考資料としてほぼ同様の質問の回答
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（今回とは InputStream がちがうので自分でさかのぼってみてください。大体は同じく finalize で閉じている )
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[stackoverflow.com 引用](https://stackoverflow.com/questions/45456509/is-inline-created-inputstream-closed-automatically-by-gc)
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```
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/**
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* Ensures that the <code>close</code> method of this file input stream is
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* called when there are no more references to it.
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*
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* @exception IOException if an I/O error occurs.
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* @see java.io.FileInputStream#close()
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*/
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protected void finalize() throws IOException {
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if ((fd != null) && (fd != FileDescriptor.in)) {
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/* if fd is shared, the references in FileDescriptor
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* will ensure that finalizer is only called when
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* safe to do so. All references using the fd have
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* become unreachable. We can call close()
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*/
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close();
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}
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}
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```
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