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Now, let's say we are given a list of employee objects listOfEmployees and we need to obtain a list of the names of employees. Here, we will use the map() method of the Stream API that takes a Function as a parameter.

Let's use this method to write the Function functional interface.

Step 3:  Write the implementation similar to a method which takes String as input and returns nothing. Please note that we need to use curly braces {} and a return statement when we want to execute multiple statements.

Step 2 : Put Array Operator

Step 1: Go to the source code functional interface for which you need to write lambda expressions and copy the parameters of its abstract method. For example: Let's say you want to write lambda expression for Consumer.

To write a Predicate:

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