What is the purpose of functional interface in java

- What is the use of functional interface in java
- What is the need of functional interface in java
- What is the main use of functional interface in java
- What is the purpose of the predicate functional interface in java
- Advantages of functional interface in java 8
- What is the benefits of functional interface in java
- What is the need of functional interface in java 8
- Purpose of functional interface in java 8
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- Advantages of using functional interface in java
- What is the purpose of the @functionalinterface annotation in java