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#java #java8 #lambda-expressions
a Functional Interface is an interface with just one abstract method declared in it.
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Java 8 Lambda Expressions Tutorial. Lambda Expression Java
eturned within the code block, or void if nothing is returned.What are Functional InterfacesIn Java, a Marker interface is an interface with no methods or fields declaration. In simple words, marker interface is an empty interface. Similarly, <span>a Functional Interface is an interface with just one abstract method declared in it.java.lang.Runnable is an example of a Functional Interface. There is only one method void run() declared in Runnable interface. Similarly ActionListener interface is also a Functional In


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