Learn how to use the Java Stream API to merge multiple Map instances into a new Map using a remapping function for duplicate keys.
Join the DZone community and get the full member experience. In Java, we can merge a key/value pair into a Map with the merge method. The first parameter is the key, the second the value, and the third parameter of the merge method is a remapping function that is applied when the key is already present in the Map instance. The remapping function has the value of the key in the original Map and the new value.
