? ProxyCollectionWriter

java.lang.Object
java.io.Writer
org.apache.commons.io.output.FilterCollectionWriter
org.apache.commons.io.output.ProxyCollectionWriter
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Closeable, Flushable, Appendable, AutoCloseable
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TeeWriter

A Proxy stream collection which acts as expected, that is it passes the method calls on to the proxied streams and doesn't change which methods are being called. It is an alternative base class to FilterWriter and FilterCollectionWriter to increase reusability, because FilterWriter changes the methods being called, such as write(char[]) to write(char[], int, int) and write(String) to write(String, int, int). This is in contrast to ProxyWriter which is backed by a single Writer.
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2.7