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Java 8 List Map
Map () returns a stream which can be converted to an individual object or a collection, such. Key(interface) = set, value(implementation class) = hashset key(interface) = list, value(implementation class) = arraylist key(interface) = map, value(implementation class) = hashmap this methodology is commonly used by all programmers if want to retrieve both key and value at the same time. Java 8 provides collectors.tomap() that is useful to convert list to map.
Collecting Stream Items Into Map In Java - Howtodoinjava from howtodoinjava.com
To avoid conflict of duplicate keys, we pass merge function otherwise it will throw illegalstateexception. Keyset () and values () methods Using lambda expression, we can convert list to map in a single line.
Keyset () and values () methods
To avoid conflict of duplicate keys, we pass merge function otherwise it will throw illegalstateexception. Because of this property, you can use a map () in java 8 to transform a collection, list, set, or map. Map is a function defined in java.util.stream.streams class, which is used to transform each element of the stream by applying a function to each element. We need to pass mapping function for key and value.
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