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java 8 merge  RSS feed

 
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in java book about OCP exam it is said that :
when calling merge method on a map using a key which value is null and the mapping function returns null the key will be removed, however when I run the following code :

I get : {0=zero, 1=aa}
does anyone knows why ??
 
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What does it say in the documentation for Map#merge()?
 
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